Updated on 2022/10/26

写真a

 
UCHIYAMA, Tomomi
 
Organization
Institute of Materials and Systems for Sustainability Division of Materials Research (DM) Professor
Graduate School
Graduate School of Information Science
Graduate School of Informatics
Title
Professor
Contact information
メールアドレス

Degree 2

  1. 工学修士

  2. 博士(工学)

Research Interests 6

  1. Multiphase Flow Engineering

  2. Fluid Engineering

  3. Computational Fluid Dynamics

  4. Computational Fluid Dynamics

  5. Multiphase Flow Engineering

  6. Fluid Engineering

Research Areas 3

  1. Others / Others  / Engineering@Machine Engineering@Fluid Mechanics

  2. Others / Others  / Interdisciprinary Area@Energy@Energy Science General

  3. Others / Others  / Interdisciprinary Area@Information Science@Intelligent Informatics

Current Research Project and SDGs 1

  1. 小型水力発電装置の開発と社会実装

Research History 5

  1. Nagoya University   Institute of Materials and Systems for Sustainability Division of Materials Research   Professor

    2018.4

  2. Nagoya University   Institute of Materials and Systems for Sustainability Division of Systems Research   Professor

    2015.10 - 2018.3

  3. Nagoya University   EcoTopia Science Institute Division of Green Systems   Professor

    2014.4 - 2015.9

  4. EcoTopia Science Institute, Professor

    2009.4

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    Country:Japan

  5. EcoTopia Science Institute, Professor

    2009.4

Education 3

  1. Nagoya University   Graduate School, Division of Engineering

    - 1987

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    Country: Japan

  2. Nagoya University   Graduate School, Division of Engineering

    - 1987

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    Country: Japan

  3. Nagoya University   Faculty of Engineering

    - 1985

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    Country: Japan

Professional Memberships 8

  1. 日本機械学会

  2. 日本混相流学会

  3. 粉体工学会

  4. ターボ機械協会

  5. 粉体工学会

  6. 日本混相流学会

  7. 日本機械学会

  8. ターボ機械協会

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Awards 8

  1. 日本計算数理工学会 論文賞

    2018.9   日本計算数理工学会   熱流動解析に対する境界条件強制型Smoothed Profile-Lattice Boltzmann

    瀬田剛,内山知実,高野登

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  2. APT Dsitinguished Paper Award

    2011.5   粉体工学会  

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    Country:Japan

  3. (財)ホソカワ粉体工学振興財団 研究奨励賞

    2007.1   (財)ホソカワ粉体工学振興財団  

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    Country:Japan

  4. 日本混相流学会 論文賞

    2003.7   日本混相流学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  5. The Water Arbitration Prize

    2003.7   The Institution of Mechanical Engineers  

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    Award type:Award from international society, conference, symposium, etc. 

  6. 日本混相流学会 奨励賞

    1998.7   日本混相流学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  7. 日本機械学会 奨励賞

    1998.4   日本機械学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  8. 日本機械学会 畠山賞

    1987.3   日本機械学会  

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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Papers 285

  1. Air-water interface dynamics and energy transition in air of a sphere passed vertically upward through the interface

    Takamure K, Uchiyama T

    EXPERIMENTAL THERMAL AND FLUID SCIENCE   Vol. 118   2020.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.expthermflusci.2020.110167

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    Scopus

  2. Numerical simulations of the flow and performance of a hydraulic Savonius turbine by the vortex in cell method with volume penalization

    Uchiyama Tomomi, Gu Qiang, Degawa Tomohiro, Iio Shouichiro, Ikeda Toshihiko, Takamure Kotaro

    RENEWABLE ENERGY   Vol. 157   page: 482 - 490   2020.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    This study is concerned with the numerical simulations of the flow and performance of a rotor of a hydraulic Savonius turbine. The flow was simulated using the vortex in cell (VIC) method in combination with the volume penalization (VP) method. The torque acting on the rotor was computed using a custom method, which can accurately calculate the fluid forces on solid bodies in flows simulated by the VIC-VP method, to analyze the rotational speed and power output of the rotor. The simulated flow around the rotating blades agreed qualitatively with the experimentally visualized flow, and the analyzed relation between the rotor's rotational speed and power output agreed with the experimentally measured relation. These demonstrate that the VIC-VP method in combined with the authors' method for calculating fluid forces is applicable for the simulations of flow and performance of hydraulic Savonius turbines. (C) 2020 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.renene.2020.05.001

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  3. Energy transition in air of a sphere launched vertically upward in water

    Takamure K, Uchiyama T

    OCEAN ENGINEERING   Vol. 207   2020.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.oceaneng.2020.107426

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  4. Dynamics of impact cratering on granular bed by hydrogel sphere

    Matsuda Yu, Kamiya Ryota, Yamaguchi Hiroki, Uchiyama Tomomi

    PHYSICS OF FLUIDS   Vol. 32 ( 6 )   2020.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    © 2020 Author(s). A lot of studies on the dynamics of a granular impact cratering by a liquid drop have been carried out. However, the results so far are controversial due to the complex impact dynamics of a liquid drop, such as deformation, splash, and penetration into the granular bed. In this study, we focused on the dynamics of the granular impact cratering by a hydrogel sphere, which deforms without splashing and penetrating. We investigated the maximal deformation time of the sphere and the lift-off time of the grains. Both the maximal deformation time and the lift-off time are similar to each other and depend on the -1/2 power of the Young's modulus of the hydrogel sphere. This power law of the maximum deformation time is the same as an impact of a gel sphere on a flat solid surface. The angle of the ejected curtain was evaluated. The angle is larger for the impact with small deformation of the sphere than that for the impact with large deformation, and the angle is less dependent on the free-fall height. We also investigated the distributions of the ejected grains using the grains dyed by a fluorescent dye. The distribution was visualized by the fluorescent images captured before and after the impact. At the crater rim, the number of the dyed grains flying to and away are balanced. The number of the dyed grains gathered at the dimensionless distance from the crater center of 1.15, where the distance is nondimensionalized by the crater radius, is the largest. This maximum value for the number of the gathered grains is larger for the impact with small deformation than that with large deformation. This result is consistent with the dependence of the impact mode on the angle of the ejected curtain.

    DOI: 10.1063/5.0011406

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  5. Motion of a spherical particle in a microbubble plume and the behavior of microbubbles around the particle

    Uchiyama Tomomi, Kawasaki Yujiro, Degawa Tomohiro, Takamure Kotaro

    PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE   Vol. 234 ( 7 ) page: 1340 - 1350   2020.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1177/0954406219893000

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  6. Numerical simulation of bubbly flow around a cylinder by semi-Lagrangian-Lagrangian method

    Van Luc Nguyen, Degawa Tomohiro, Uchiyama Tomomi, Takamure Kotaro

    INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW   Vol. 29 ( 12 ) page: 4660 - 4683   2019.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1108/HFF-03-2019-0227

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  7. Numerical simulation of fluid forces on moving solid body by the vortex in cell method with volume penalization

    Degawa Tomohiro, Gu Qiang, Uchiyama Tomomi, Takamure Kotaro

    AEROSPACE SCIENCE AND TECHNOLOGY   Vol. 94   2019.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.ast.2019.105360

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  8. Deformation of a vortex ring caused by its impingement on a sphere

    Van Luc Nguyen, Takamure Kotaro, Uchiyama Tomomi

    PHYSICS OF FLUIDS   Vol. 31 ( 10 )   2019.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1063/1.5122260

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  9. Numerical simulation of the interaction between a vortex ring and a bubble plume

    Van Luc Nguyen, Degawa Tomohiro, Uchiyama Tomomi

    INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW   Vol. 29 ( 9 ) page: 3192 - 3224   2019.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1108/HFF-12-2018-0734

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  10. Numerical simulation of annular bubble plume by vortex in cell method

    Van Luc Nguyen, Degawa Tomohiro, Uchiyama Tomomi

    INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW   Vol. 29 ( 3 ) page: 1103 - 1131   2019.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1108/HFF-03-2018-0094

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  11. FLOW PAST TWO CYLINDERS ARRANGED IN TANDEM WITHIN A MICROBUBBLE PLUME

    Uchiyama Tomomi, Kano Ryota, Degawa Tomohiro, Takamure Kotaro

    PROCEEDINGS OF THE ASME/JSME/KSME JOINT FLUIDS ENGINEERING CONFERENCE, 2019, VOL 5     page: .   2019

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    Language:English   Publishing type:Research paper (scientific journal)  

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  12. EXPERIMENTAL STUDY OF MIXING OF TWO-LAYER DENSITY-STRATIFIED FLUID BY A VORTEX RING

    Cao Lile, Ito Ryo, Degawa Tomohiro, Matsuda Yu, Takamure Kotaro, Uchiyama Tomomi

    PROCEEDINGS OF THE ASME/JSME/KSME JOINT FLUIDS ENGINEERING CONFERENCE, 2019, VOL 5     page: .   2019

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    Language:English   Publishing type:Research paper (scientific journal)  

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  13. Development of a propeller-type hollow micro-hydraulic turbine with excellent performance in passing foreign matter Reviewed

    Uchiyama, T., Honda, S. and Degawa, T.

    Renewable Energy   Vol. 126   page: 545-551   2018

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.1016/j.renene.2018.03.083

  14. Numerical simulation of jet issuing diagonally upward into density-stratified fluid in cylindrical tank Reviewed

    Degawa, T., Uchiyama, T., Aozasa, I., Ishikawa, A. and Motoyama, K.

    J. Power and Energy Eng.   Vol. 6 ( 3 ) page: 38-52   2018

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  15. Smoothed profile-lattice Boltzmann method for non-penetration and wetting boundary conditions in two and three dimensions Reviewed

    Takeshi Seta, Tomomi Uchiyama, Noboru Takano

    COMPUTERS & FLUIDS   Vol. 159   page: 64 - 80   2017.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    In this study, the smoothed profile-lattice Boltzmann method (SP-LBM) is proposed to determine the contact line dynamics on a hydrophobic or a hydrophilic curved wall. Two types of smoothed indicator functions are introduced, namely a function that identifies the solid domain for non-slip and non-penetration conditions and a function that denotes the boundary layer for no mass-flux and the wetting boundary conditions. In order to prevent fluid penetration into the solid boundary, the fluid-solid interaction force is computed based on the definition of the fluid velocity as proposed by Guo et al. [1]. In order to implement the Neumann boundary conditions for the order parameter and the chemical potential, the fluxes from the solid surfaces are distributed to relevant physical valuables through a smoothed profile. Several two-dimensional and three-dimensional numerical investigations including those determining the Couette flows, flow around a circular cylinder, transition layer on a wetting boundary, and dynamic behavior of a droplet on a flat or curved plate demonstrate the efficiency of the present method in calculating the contact angle of a droplet on curved surfaces with wall impermeability. The present model provides a simple algorithm to compute the surface normal vector and contact line dynamics on an arbitrarily shaped boundary by using a smoothed-profile. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.compfluid.2017.09.012

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  16. Control of air bubble cluster by a vortex ring launched into still water Reviewed

    Uchiyama, T., Kusamichi, S.

    Int. J. Chemical Engineering and Applications   Vol. 8 ( 1 ) page: 37-46   2017

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  17. Generation and transport of solid particle clusters using a vortex ring launched into water Reviewed

    Uchiyama, T., Yano, C., and Degawa, T.

    Int. J. Chemical Engineering and Applications   Vol. 8 ( 4 ) page: 253-260   2017

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  18. Behavior of a jet issuing diagonally upward into two-layer density-stratified fluid in a cylindrical tank Reviewed

    Degawa, T., Fukue, S., Uchiyama, T., Ishikawa, A., and Motoyama, K.

    J. Flow Control, Measurement & Visualization   Vol. 5   page: 51-64   2017

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  19. Study of the interactions between rising air bubbles and vortex core of swirling water flow around vertical axis Reviewed

    Chemical Engineering Science   Vol. 142   page: 137-143   2016

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  20. Numerical simulation of the interactions between a vortex ring and solid particles suspended above a horizontal wall Reviewed

      Vol. 301   page: 966-980   2016

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  21. Experimental study of flow around a circular cylinder inside a bubble plume Reviewed

    Uchiyama, T., Ishiguro, Y.

    Advances in Chem. Eng. Sci.   Vol. 6   page: 269-280   2016

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  22. A feasibility study of power generation from sewage using a hollowed pico-hydraulic turbine Reviewed

    Uchiyama, T., Honda, T., Okayama, T. and Degawa, T.

    Engineering   Vol. 2   page: 510-517   2016

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  23. Effects of clearance between rotor and ground on the performance of an open cross-flow-type nano-hydraulic turbine Reviewed

    Uchiyama, T., Mizoguchi, S., Iio, S., Katayama, Y. and Ikeda, T.

    J. Energy and Power Engineering   Vol. 10   page: 465-473   2016

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  24. Numerical study on the flow and performance of an open cross-flow mini-hydraulic turbine Reviewed

    Uchiyama, T., Uehara, S., Fukuhara, H., Iio, S. and Ikeda, T.

    J. Power and Energy, Proc. IMechE Part A   Vol. 229 ( 8 ) page: 968-977   2015

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  25. Direct numerical simulation of a turbulent channel flow by an improved vortex in cell method Reviewed

    Uchiyama, T., Yoshii, Y. and Hamada, H.

    Int. J. Numerical Methods for Heat and Fluid Flow   Vol. 24   page: 103-123   2014

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  26. Numerical simulation of water flow through nano-hydraulic turbine driven by rapid and shallow stream Reviewed

    Uchiyama, T., Uehara, S., Iio, S., Ikeda, T., and Ide, Y.

    J. Energy and Power Engineering   Vol. 8   page: 1663-1672   2014

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  27. Numerical simulation of bubble cluster induced flow by three-dimensional vortex-in-cell method Reviewed

    Chen, B., Wang, Z. and Uchiyama, T.

    Trans. ASME, J. Fluids Eng.   Vol. 136   page: 081301-1 - 081301-16   2014

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  28. Numerical simulation of the interactions between a vortex pair and solid particles near a wall Reviewed

    Uchiyama, T. and Shimada, S.

      Vol. 257   page: 55-67   2014

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  29. Numerical simulation of particle-laden gas flow by vortex in cell method Reviewed

    Uchiyama, T.

    Powder Technology   Vol. 235   page: 376-385   2013

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  30. Interaction of bubbles with vortex ring launched into bubble plume Reviewed

    Uchiyama, T. and Kusamichi, S.

    Advances in Chemical Engineering and Science   Vol. 3   page: 207-217   2013

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  31. Numerical simulation of the interaction between vortex ring and bubble plume Reviewed

    Wang, Z., Uchiyama, T. and Chen, B.

    Applied Mathematical Modelling   Vol. 37   page: 10007-10026   2013

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  32. Numerical Simulation of Interaction between a Vortex Ring and Gas Bubbles Reviewed

    Uchiyama, T.

    Fortschritt-Berichte VDI   Vol. 3 ( 929 ) page: 36-50   2012

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  33. Numerical Simulation for the Transport of Solid Particles with a Vortex Ring Reviewed

    Yagami, H. and Uchiyama, T.

    Advanced Powder Technology   Vol. 22   page: 115-123   2011

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  34. Vortex in Cell法による平行平板間乱流の直接数値シミュレーション Reviewed

    内山知実,濱田廣貴,吉井佑太郎

    日本機械学会論文集B編   Vol. 77 ( 777 ) page: 1178-1188   2011

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  35. 非圧縮性流れ解析に対するVortex in Cell法の改良 Reviewed

    内山知実,吉井佑太郎

    日本機械学会論文集B編   Vol. 77 ( 775 ) page: 1178-1188   2011

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  36. Numerical Simulation of a Turbulent Channel Flow by Vortex Method Reviewed

    Uchiyama, T., Hamada, H. and Yoshii, Y.

    Proc. 5th International Conference on Vortex Flows and Vortex Models   Vol. CD-ROM   2010.11

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  37. Vortex Simulation for Dispersed Gas-Liquid Two-Phase Flows Invited Reviewed

    Uchiyama, T.

    Proc. 5th International Conference on Vortex Flows and Vortex Models   Vol. CD-ROM   2010.11

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  38. 三次元渦法による気泡流の数値解析 Reviewed

    内山知実・松村彰士

    日本機械学会論文集B編   Vol. 76 ( 762 ) page: 211-218   2010

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  39. Three-Dimensional Vortex Method for the Simulation of Bubbly Flow Reviewed

    Uchiyama, T. and Matsumura, S.

    Trans. ASME, J. Fluids Eng.   Vol. 132   page: 101402-1 - 101402-8   2010

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  40. Numerical Simulation for Bubbly Flow by Three-Dimensional Vortex Method Reviewed

    Uchiyama, T. and Matsumura, S.

    Proc. 3rd International Conference on Jets, Wakes and Separated Flows   Vol. CD-ROM   2010

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  41. 固体粒子が付加された低Reynolds数気相噴流の渦法解析 Invited Reviewed

    八神寿徳・内山知実

    日本機械学会論文集B編   Vol. 76 ( 766 ) page: 953-960   2010

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  42. Numerical Simulation for the Transport of Solid Particles with a Vortex Ring Reviewed

    Uchiyama, T. and Yagami, H.

    Proc. World Congress on Particle Technology   Vol. CD-ROM   2010

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  43. 渦法による非蒸発噴霧流の数値解析 Reviewed

    内山知実

    日本混相流学会会誌   Vol. 23 ( 5 ) page: 507-514   2010

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  44. 固気二相流に対する三次元グリッドフリー渦法 Reviewed

    内山知実,成瀬正章

    日本機械学会論文集B編   Vol. 75 ( 750 ) page: 219-226   2009

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  45. *Numerical Simulation of Non-Evaporating Spray Jet by Vortex Method Reviewed

    Uchiyama, T.

    Atomization and Sprays   Vol. 19 ( 10 ) page: 917-928   2009

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  46. Behavior of a Vortex Ring Launched into Annular Bubble Plume Reviewed

    Uchiyama, T. and Igarashi, K.

    Proc. 6th Pacific Symposium on Flow Visualization and Image Processing   Vol. on CD-ROM   2009

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  47. Vortex Simulation for Non-axisymmetric Collision of a Vortex Ring with Solid Particles Reviewed

    Uchiyama, T. and Yagami, H.

    Advanced Powder Technology   Vol. 20   page: 447-454   2009

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  48. Vortex Simulation of Bubble Plume around a Rectangular Cylinder Reviewed

    Uchiyama, T. and Degawa, T.

    Int. J. Transport Phenomena   Vol. 11 ( 3 ) page: 219-232   2009

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  49. Numerical Simulation of Low Reynolds Number Particle-Laden Gas Jet by Vortex Method Reviewed

    Uchiyama, T. and Yagami, H

    J. Fluid Science and Technology   Vol. 4 ( 2 ) page: 335-347   2009

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  50. Numerical Simulation of Particle-Laden Gas Jet by Lagrangian Method Invited Reviewed

    Tomomi Uchiyama

    Proc. 2nd Int. Conf. Jets, Wakes and Separated Flows     page: on CD-ROM   2008.9

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  51. Vortex Simulation of Low Reynolds Number Gas Jet Laden with Solid Particles Reviewed

    Tomomi Uchiyama, Hisanori Yagami

    Proc. 2nd Int. Conf. Jets, Wakes and Separated Flows     page: on CD-ROM   2008.9

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  52. 渦法を用いた固気二相流の二次元グリッドフリー解法 Reviewed

    内山知実,成瀬正章

    日本機械学会論文集B編   Vol. 74 ( 742 ) page: 1324-1331   2008.6

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  53. Numerical Simulation for Unaxisymmetric Collision of a Vortex Ring with Solid Particles Reviewed

    Tomomi Uchiyama, Hisanori Yagami

    Proc. 4th Int. Conf. Vortex Flows and Vortex Models     page: on CD-ROM   2008.4

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  54. *Numerical Simulation for the Collision between a Vortex Ring and Solid Particles Reviewed

    Tomomi Uchiyama, Hisanori Yagami

    Powder Technology   Vol. 188   page: 73-80   2008

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  55. Numerical Simulation of Bubbly Flow around Two Tandem Square-Section Cylinders by Vortex Method Reviewed

    Tomomi Uchiyama, Tomohiro Degawa

    J. Mechanical Engineering Science   Vol. 222 ( 2 ) page: 225-234   2008

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  56. Two-Dimensional Vortex Simulation of Particulate Air Flow Induced by Free Falling Particles Reviewed

    Tomomi Uchiyama, Masaaki Naruse

    Int. J. Engineering Systems Modelling and Simulation   Vol. 1 ( 1 ) page: 30-38   2008

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  57. Numerical Simulation of Plane Bubble Plume by Vortex Method Reviewed

    Tomomi Uchiyama, Tomohiro Degawa

    J. Mechanical Engineering Science   Vol. 222 ( 7 ) page: 1193-1201   2008

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  58. Particle Simulation of the Plume Diffusion Field around a Circular Cylinder Reviewed

    Uchiyama, T. Yagami, H. and Sugiyama, M.

    Int. J. Modelling and Simulation   Vol. 28 ( 3 ) page: 323-328   2008

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  59. 渦輪による固体粒子群の輸送の数値シミュレーション Reviewed

    八神寿徳,内山知実

    粉体工学会誌   Vol. 45 ( 12 ) page: 827-834   2008

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

  60. Numerical Simulation for the Transport of Solid Particles with a Vortex Ring Reviewed

    Hisanori Yagami, Tomomi Uchiyama

    Proc. Int. Sympo. EcoTopia Science 2007   Vol. on CD-ROM   2007.11

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  61. Vortex Simulation of the Bubbly Flow around a Hydrofoil Reviewed

    Tomohiro Degawa, Tomomi Uchiyama

    Proc. 9th Int. Conf. Fluid Machinery   Vol. on CD-ROM   2007.10

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  62. Numerical Simulation of Plane Mixing Layer by Three-Dimensional Vortex Method Reviewed

    Hisanori Yagami, Tomomi Uchiyama

    Int. J. Turbo & Jet Engines   Vol. 24   page: 93-101   2007

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  63. Vortex Simulation of the Bubbly Flow around a Hydrofoil Reviewed

    Tomomi Uchiyama, Tomohiro Degawa

    Int. J. Rotating Machinery   Vol. 2007   page: 9   2007

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  64. Numerical Prediction for the Bubbly Flow around a Hydrofoil by Vortex Method Reviewed

    Uchiyama,T. and Degawa, T.

    Proc. 5th Joint ASME/JSME Fluid Eng. Conf.   Vol. on CD-ROM   2007

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  65. Numerical Study on a Compound Round Jet Controlled by Loading Solid Particles Reviewed

    Uchiyama, T. and Fukase, A.

    Int. J. Transport Phenomena   Vol. 9   page: 19-32   2007

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  66. 角柱周りの気泡プルームの渦法解析 Reviewed

    出川智啓,内山知実

    混相流研究の進展2     page: 149-156   2007

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  67. 渦輪と固体粒子群の干渉の数値解析 Reviewed

    八神寿徳,内山知実

    混相流研究の進展2     page: 181-188   2007

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  68. 渦法による平面気泡プルームの数値解析 Reviewed

    出川智啓,内山知実

    日本機械学会論文集B編   Vol. 73 ( 727 ) page: 703-710   2007

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  69. Numerical Visualization for the Collision of a Vortex Ring with Solid Particles Reviewed

    Uchiyama, T. and Yagami, H.

    Proc. 6th Pacific Sympo. Flow Visualization and Image Processing   Vol. on CD-ROM   2007

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  70. Numerical Simulation of Bubbly Flow around a Pair of Tandem Square Cylinders by Vortex Method Reviewed

    Degawa, T. and Uchiyama, T.

    Proc. 6th Int. Conf. Multiphase Flow   Vol. on CD-ROM   2007

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  71. Vortex Simulation for the Interaction between a Vortex Ring and Solid Particles Reviewed

    Uchiyama, T. and Yagami, H.

    Proc. 6th Int. Conf. Multiphase Flow   Vol. on CD-ROM   2007

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  72. Numerical Simulation for the Collision of a Vortex Ring with Solid Particles Reviewed

    Yagami, H. and Uchiyama, T.

    Proc. 5th Joint ASME/JSME Fluid Eng. Conf.   Vol. on CD-ROM   2007

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  73. Measurement for Individual Gas-Liquid Two-Phase Flow Rates Based on Stochastic Features of Differential Pressure Fluctuation Reviewed

    Uchiyama, T., Tominaga, H. and Minemura, K.

    Proc. 5th Joint ASME/JSME Fluid Eng. Conf.   Vol. on CD-ROM   2007

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  74. Three-dimensional vortex simulation of particle-laden air jet Reviewed

    Uchiyama, T. and Fukase, A.

      Vol. 61   page: 1767-1778   2006.1

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  75. Three-dimensional vortex simulation for particulate jet generated by free falling particles Reviewed

    Uchiyama, T. and Naruse, M.

    Chemical Engineering Science   Vol. 61   page: 1913-1921   2006.1

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    The particulate jet generated by solid particles falling from a circular orifice into an unbounded quiescent air is simulated. The three-dimensional vortex method, proposed for the analysis of particle-laden free turbulent flow in a prior study, is employed for the simulation. It is found that the falling particles induce complicated three-dimensional unsteady air flow involving large-scale eddies.
    The air takes its maximum velocity at the jet centerline,
    and the velocity profile satisfies the self-similarity around the centerline. The effect of particle diameter on the velocity distribution for the two phases is ivestigated. The entrained air flow rate is favorably compared with the value predicted by the analytical models.

  76. *Numerical Simulation of Reacting Plane Mixing Layer by Particle Method Reviewed

    Uchiyama, T. and Naruse, M.

    Chem. Eng. Sci   Vol. 61   page: 7299-7308   2006

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  77. Vortex Simulation of Gas-Particle Two-Phase Compound Round Jet Reviewed

    Uchiyama, T. and Fukase, A.

    Powder Technology   Vol. 165   page: 83-91   2006

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  78. Numerical Simulation of the Interaction between a Vortex Ring and Solid Particles Reviewed

    Yagami, H. and Uchiyama, T.

    Proc. 17th Int. Sympo. Transport Phenomena   Vol. on CD-ROM   2006

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  79. Vortex Simulation of the Bubble Plume around a Rectangular Cylinder Reviewed

    Degawa, T., Uchiyama, T. and Takamatsu, Y.

    Proc. 17th Int. Sympo. Transport Phenomena   Vol. on CD-ROM   2006

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  80. Vortex Method for Free-Surface Flow Generated by Submerged Circular Cylinder Reviewed

    Uchiyama, T. and Degawa, T.

    Proc. 23rd IAHR Sympo   Vol. on CD-ROM   2006

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  81. Numerical Simulation for Gas-Liquid Two-Phase Free Turbulent Flow Based on Vortex in Cell Method Reviewed

    Uchiyama, T. and Degawa, T.

    JSME Int. J., Ser. B   Vol. 49 ( 4 ) page: 1008-1015   2006

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  82. Numerical Simulation of Particle-Laden Plane Mixing Layer by Three-Dimensional Vortex Method Reviewed

    Yagami, H. and Uchiyama, T.

    JSME Int. J. Ser.B   Vol. 49 ( 4 ) page: 1027-1035   2006

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  83. Vortex in Cell法による気液二相自由乱流の数値解析 Reviewed

    内山知実,出川智啓

    日本機械学会論文集B編   Vol. 72 ( 718 ) page: 1418-1425   2006

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    水流中に微小な気泡が分散し,水流と気泡が相互作用を及ぼし合いながら流れる気泡流に対する渦法を開発した.角柱周りの気泡流の解析に適用し,得られた結果が実験結果と一致することを確認し,解法の妥当性も示した.

  84. Vortex Simulation for Gas-Particle Two-Phase Plane Mixing Layer Reviewed

    Yagami, H. and Uchiyama, T.

    Proc. 11th Asian Cong. Fluid Mech.   Vol. on CD-ROM   2006

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  85. Vortex Simulation of the Bubbly Flow around a Square-Section Cylinder Reviewed

    Degawa, T. and Uchiyama, T.

    Proc. 11th Asian Cong. Fluid Mech.   Vol. on CD-ROM   2006

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  86. *Three-dimensional vortex method for gas-particle two-phase compound round jet Reviewed

    Uchiyama, T., Fukase, A.

    Trans. ASME, J. Fluids Engineering   Vol. 127   page: 32-40   2005

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  87. Numerical simulation of particle-laden mixing layer by vortex method Reviewed

    Yagami, H., Uchiyama, T.

    Proc. Int. Conf. Jets, Wakes and Separated Flows     page: 313-318   2005

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  88. Numerical simulation of the bubbly flow around a rectangular cylinder by vortex in cell method Reviewed

    Degawa, T., Uchiyama, T.

    Proc. Int. Conf. Jets, Wakes and Separated Flows     page: 235-240   2005

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  89. Numerical simulation of plume diffusion field around a circular cylinder by particle method Reviewed

    Uchiyama, T., Yagami, H., Sugiyama, M.

    Proc. 3rd Int. Conf. Vortex Flows and Vortex Methods     page: 356-361   2005

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  90. Numerical simulation of bubble-driven plume by vortex method Reviewed

    Uchiyama, T., Degawa, T.

    Proc. 3rd Int. Conf. Vortex Flows and Vortex Methods     page: 350-355   2005

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  91. Numerical prediction of particle-laden air jet by three-dimensional vortex method Reviewed

    Uchiyama, T., Fukase, A.

    Proc. 3rd Int. Conf. Vortex Flows and Vortex Methods     page: 218-286   2005

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  92. Numerical study on the performance of a micropump with a wiggling blade Reviewed

    Uchiyama, T., Kikuyama, K.

    J. Mechanical Engineering Science   Vol. 219   page: 1069-1077   2005

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  93. 自由落下粒子群が形成する粒子噴流の三次元渦法解析 Reviewed

    内山知実,成瀬正章

    日本機械学会論文集B編   Vol. 71 ( 707 ) page: 1738-1745   2005

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  94. Numerical analysis of gas-particle two-phase wake flow by vortex method Reviewed

    Uchiyama, T., Yagami, H.

    Powder Technology   Vol. 149   page: 112-120   2005

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  95. Numerical simulation for diffusion of matter in compound round jet by three-dimensional particle method Reviewed

    Uchiyama, T., Ichikawa, A.

    Chemical Engineering Science   Vol. 60   page: 337-345   2005

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  96. Numerical simulation of blood flow in a cerebral aneurysm Reviewed

    Uchiyama, T., Fukuda, T., Arai, F., Negoro, M., Ikeda, S.

    Proc. 6th KSME-JSME Thermal and Fluids Engineering Conf.     page: on CD-ROM   2005

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  97. Vortex simulation for particulate jet generated by free falling particles Reviewed

    Uchiyama, T., Naruse, M.

    Proc. 6th KSME-JSME Thermal and Fluids Engineering Conf.     page: on CD-ROM   2005

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  98. 気泡流中におけるマイクロ屈曲翼の推進特性の数値シミュレーション Reviewed

    内山知実,菊山功嗣

    ターボ機械   Vol. 33 ( 4 ) page: 230-240   2005

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  99. Numerical study on the propulsive performance of a submerged wiggling micromachine in straight conduit Reviewed

    Uchiyama, T., Kikuyama, K.

    J. Mechanical Engineering Science   Vol. 219   page: 409-418   2005

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  100. Numerical simulation of particle-laden gas wake flow by vortex method Reviewed

    Uchiyama, T., Yagami, H.

    Proc. 4th Int. Symp. Environmental Hydraulics     page: on CD-ROM   2004

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  101. Three-dimensional vortex simulation of bubble dispersion in excited round jet Reviewed

    Uchiyama, T.

    Chemical Engineering Science   Vol. 59   page: 1403-1413   2004

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  102. 二次元混合層における物質拡散の粒子法解析 Reviewed

    内山知実,村上賢司,大槻直洋

    日本機械学会論文集B編   Vol. 70 ( 692 ) page: 839-846   2004

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  103. Numerical simulation for gas-particle two-phase free turbulent flow based on vortex in cell method Reviewed

    Uchiyama, T., Naruse, M.

    Powder Technology   Vol. 142   page: 193-208   2004

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  104. 三次元渦法による固気二相同軸円形噴流の数値解析 Reviewed

    内山知実,深瀬昭仁

    日本機械学会論文集B編   Vol. 70 ( 696 ) page: 1957-1964   2004

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  105. *Numerical simulation for the propulsion performance of a submerged wiggling micromachine Reviewed

    Uchiyama, T., Kikuyama, K.

    J. Micromechanics and Microengineering   Vol. 14   page: 1537-1543   2004

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  106. Numerical simulation of gas-particle two-pahse jet by three-dimensional vortex method Reviewed

    Uchiyama, T., Fukase, A.

    Proc. 5th Int. Conf. Multiphase Flow     page: on CD-ROM   2004

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  107. Numerical simulation for bubble-laden free turbulent flow by vortex in cell method Reviewed

    Uchiyama, T., Degawa, T.

    Proc. 5th Int. Conf. Multiphase Flow     page: on CD-ROM   2004

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  108. Numerical analysis of particulate jet generated by free falling particles Reviewed

    Uchiyama, T.

    Powder Technology   Vol. 145   page: 123-130   2004

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  109. Numerical simulation of particle-laden compound round jet by vortex method Reviewed

    Uchiyama, T., Fukase, A., Minemura, K.

    Proc. 3rd Int. Symp. Two-Phase Flow Modelling and Experimentation     page: on CD-ROM   2004

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  110. Numerical simulation for bubble-laden plane mixing layer by vortex in cell method Reviewed

    Uchiyama, T., Degawa, T.

    Proc. 3rd Int. Symp. Two-Phase Flow Modelling and Experimentation     page: on CD-ROM   2004

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  111. Numerical analysis for the effect of Reynolds number on propulsive performance of a submerged wiggling micromachine Reviewed

    Uchiyama, T., Kikuyama, K.

    Proc. 2004 Int. Symp. Micro/Nanomechatronics and Human Science     page: 295-300   2004

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  112. Vortex simulation for bubble-Laden free turbulent flow Reviewed

    Uchiyama, T., Degawa, T., Takamatsu, Y.

    Proc. Japan-US Seminar on Two-Phase Flow Dynamics     page: 261-270   2004

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  113. Numerical Prediction of Added Mass and Damping for a Cylinder Oscillating in Confined Incompressible Gas-Liquid Two-Phase Mixture Reviewed

    T. Uchiyama

    Nuclear Engineering and Design   Vol. 222   page: 68-78   2003

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  114. 自由落下粒子群が形成する粒子噴流の数値解析 Reviewed

    内山知実,北野佳伸

    日本機械学会論文集B編   Vol. 69 ( 684 ) page: 1737-1745   2003

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  115. Observation and numerical simulation for wet chamical etching process of semiconductor Reviewed

    Kaneko, K., Noda, T., Sakata, M., Uchiyama, T.

    Proc. 4th ASME/JSME Joint Fluids Engineering Conf.     page: on CD-ROM   2003

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  116. Vortex in Cell法による固気二相自由乱流の数値解析 Reviewed

    内山知実,成瀬正章

    日本機械学会論文集B編   Vol. 69 ( 686 ) page: 2200-2207   2003

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  117. Numerical prediction of the round jet in a co-flowing stream by three-dimensional vortex method Reviewed

    Uchiyama, T.

    Int. J. Turbo & Jet Engines   Vol. 20 ( 3 ) page: 235-244   2003

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  118. Three-dimensional simulation for diffusion of matter in compound round jet by particle method Reviewed

    Uchiyama, T., Ichikawa, A.

    Proc. 4th ASME/JSME Joint Fluids Engineering Conf.     page: on CD-ROM   2003

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  119. Numerical simulation for free turbulent reacting flow by particle method Reviewed

    Uchiyama, T., Otsuki, N.

    Proc. 4th ASME/JSME Joint Fluids Engineering Conf.     page: on CD-ROM   2003

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  120. Numerical simulation of particulate jet generated by free falling particles Reviewed

    Uchiyama, T.

    Proc. 4th ASME/JSME Joint Fluids Engineering Conf.     page: on CD-ROM   2003

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  121. Numerical simulation of a compound jet by three-dimensional vortex method Reviewed

    Uchiyama, T.

    Proc. 4th ASME/JSME Joint Fluids Engineering Conf.     page: on CD-ROM   2003

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  122. Three-dimensional vortex simulation for gas-particle two-phase compound round jet Reviewed

    Uchiyama, T., Fukase, A., Minemura, K.

    Proc. 2nd Asian Particle Technology Symp.     page: 359-364   2003

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  123. Numerical simulation of wake gas flow laden with solid particles Reviewed

    Uchiyama, T., Yagami, H.,

    Proc. 2nd Asian Particle Technology Symp.     page: 353-358   2003

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  124. A numerical method for gas-solid two-phase free turbulent flow using a vortex method Reviewed

    Uchiyama, T., Naruse, M.

    Powder Technology   Vol. 119   page: 206-214   2001

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  125. Numerical Prediction of Plume Diffusion Field around a Circular Cylinder by Particle Method Reviewed

    T. Uchiyama and T. Okita

    Advences in Environmental Research   Vol. 7   page: 573-581   2003

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  126. Vortex Simulation of Slit Nozzle Gas-Particle Two-Phase Jet Reviewed

    T. Uchiyama nad M. Naruse

    Powder Technology   Vol. 131   page: 156-165   2003

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  127. Stochastic Features of Fluctuating Pressure Waveforms through a Wedge in Air-Water Flow Reviewed

    N. Masutani, T. Uchiyama, K. Minemura and H. Tokai

    Proc. 5th JSME-KSME Fluids Eng. Conf.     2002

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  128. Numerical Simulation of the Bubbly Flow around a Hydrofoil in Pitching and Heaving Motions Reviewed

    T. Uchiyama and M. Ido

    Proc. 5th JSME-KSME Fluids Eng. Conf.     2002

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  129. Vortex in Cell Method for Gas-Particle Two-Phase Free Turbulent Flow Reviewed

    M. Naruse and T. Uchiyama

    Proc. 5th JSME-KSME Fluids Eng. Conf.     2002

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  130. Particle Simulation for Diffusion of Matter in Plane Mixing Layer Reviewed

    N. Otsuki, K. Murakami and T. Uchiyama

    Proc. 5th JSME-KSME Fluids Eng. Conf.     2002

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  131. Vortex Simulation of Bubble Dispersion in an Excited Round Jet Reviewed

    T. Uchiyama and T. Honda

    Proc. German-Japanese Workshop on Multiphase Flow     2002

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  132. Numerical Study on the Propulsive Performance of a Wiggling Blade in Bubbly Flow Reviewed

    T. Uchiyama

    J. Mechanical Engineering Science   Vol. 216   page: 1187-1196   2002

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  133. Numerical Simulation of Gas-Particle Two-Phase Mixing Layer by Vortex Method Reviewed

    T. Uchiyama and M. Naruse

    Powder Technology   Vol. 125   page: 111-121   2002

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  134. Finite Element Analysis of Bubbly Flow Around an Oscillating Square-Section Cylinder Reviewed

    T. Uchiyama

    Finite Elements in Analysis and Design   Vol. 38   page: 803-821   2002

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  135. Numerical Prediction of Bubbly Flow Around an Oscillating Hydrofoil by Incompressible Two-Fluid Model. Reviewed

    T. Uchiyama

    Int. J. Rotating Machinery   Vol. 8 ( 4 ) page: 295-304   2002

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  136. Finite Element Method of Gas-Liquid Two-Phase Flow Across an In-Line Tube Bundle Reviewed

    T. Uchiyama

    Hybrid Methods in Engineering   Vol. 2 ( 4 ) page: 355-372   2002

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  137. Numerical Simulation of Plume Diffusion Field around a Circular Cylinder by Vortex Method. Reviewed

    T. Uchiyama and T. Okita

    3rd Int. Symposium on Environmental Hydraulics     2001

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  138. Vortex Simulation of Gas-Particle Two-Phase Mixing Layer Reviewed

    Tomomi Uchiyama, Masaaki Naruse, Kosuke Hirata

    Proc. 4th International Conference on Multiphase Flow     2001

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  139. 渦法によるスリットノズル固気二相噴流の数値シミュレーション Reviewed

    成瀬正章,内山知実

    混相流   Vol. 15 ( 3 ) page: 280-287   2001

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  140. A Numerical Method for Gas-Solid Two-Phase Free Turbulent Flow Using a Vortex Method Reviewed

    T. Uchiyama and M. Naruse

    Powder Technology   Vol. 119   page: 206-214   2001

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  141. 固気二相自由乱流の渦法解析 Reviewed

    内山知実

    混相流   Vol. 15 ( 2 ) page: 140-150   2001

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  142. ALE Finite Element Method for Gas-Liquid Two-Phase Flow Including Moving Boundary b\Based on an Incompressible Two-Fluid Model Reviewed

    Tomomi Uchiyama

    Nuclear Engineering and Design   Vol. 205   page: 69-82   2001

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  143. Numerical Study on Solid Liquid Two-Phase Flow around a Circular Cylinder Using a Vortex Method Reviewed

    omomi Uchiyama, Hikaru Arai, Masaaki Naruse

    Proc. Asia Particle Technology     2000

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  144. Numerical Simulation of Gas-Particle Two-Phase Jet by Vortex Method Reviewed

    Tomomi Uchiyama, Masaaki Naruse

    Proc. Asian Particle Technology     2000

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  145. A vortex method for gas-solid two-phase free turbulent flow (Numerical model and application to plane mixing layer) Reviewed

    Transactions of the Japan society of mechanical engineers   Vol. 66 ( 651 ) page: 2853-2860   2000

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  146. Numerical Simulation of Bubbly Flow Arounda Cross-Flow Forced Oscillating Cylinder Reviewed

    Uchiyama, T., Minemura, K.

    Proc. 2nd Japanese-European Two-Phase Flow Group Meeting     2000

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  147. Numerical Analysis of Air-Water Two-Phase Flow Across a Staggered Tube Bundle Using an Incompressible Two-Fluid Model Reviewed

    Uchiyama, T.

    Nuclear Science and Engineering   Vol. 134 ( 3 ) page: 281-292   2000

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  148. 三次元一般座標系に対するCIP法粘性流解法 Reviewed

    高下和浩,峯村吉泰,内山知実

    日本機械学会論文集B編   Vol. 66 ( 643 ) page: 755-760   2000

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  149. ALE有限要素法による移動境界を含む気液二相流の数値解析(非圧縮性二流体モデルを用いた解法) Reviewed

    内山知実,峯村吉泰

    日本機械学会論文集B編   Vol. 66 ( 647 ) page: 1627-1635   2000

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  150. 千鳥配列円管群における直交気液二相流の数値解析 Reviewed

    内山知実,峯村吉泰

    日本機械学会論文集B編   Vol. 65 ( 636 ) page: 2611-2618   1999

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  151. Petrov-Galerkin Finite Element Method for Gas-Liquid Two-Phase Flow Based on an Incompressible Two-Fluid Model Reviewed

    Tomomi Uchiyama

    Nuclear Engineering and Design   Vol. 193   page: 145-157   1999

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  152. Numerical Simulation of Bubbly Flow Around an Oscillating Hydrofoil Reviewed

    Tomomi Uchiyama, Kiyoshi Minemura

    Proc. Asian Symposium on Multiphase Flow     page: 27-32   1999

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  153. Numerical Simulation of Gas-Liquid Two-Phase Flow Around a Rectangular Cylinder by the Incompressible Two-Fluid Model Reviewed

    Tomomi Uchiyama

    Nuclear Science and Engineering   Vol. 133 ( 1 ) page: 92-105   1999

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  154. Fault Diagnostic Method for Pump Running Conditions Based on Process Modeling and Neural Network(共著) Reviewed

    Tomomi Uchiyama, Stephan Kallweit, Helmut Siekmann

    Int. J. Rotating Machinery   Vol. 4 ( 1 ) page: 49-59   1998

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  155. 上流型有限要素法による非圧縮性二流体モデルの数値解析(共著) Reviewed

    内山知実,峯村吉泰

    日本機械学会論文集B編   Vol. 64 ( 618 ) page: 420-427   1998

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  156. Prediction of Air-Water Two-Phase Flow Performance of a Centrifugal Pump Based on One-Dimensional Two-Fluid Model Reviewed

    Minemura, K., Uchiyama, T., Shoda, S., Egashira, K.

    Trans. ASME, J. Fluids Engineering   Vol. 120 ( 2 ) page: 327-334   1998

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  157. Numerical Simulation of Cavitating Flow Using the Upstream Finite Element Method Reviewed

    Uchiyama, T.

    Applied Mathematical Modelling   Vol. 22   page: 235-250   1998

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  158. Accuracy of Large Eddy Simulation for Turbulent Flow by the Finite Element Method Reviewed

    Uchiyama, T.

    J. Mechanical Engineering Science   Vol. 212   page: 643-650   1998

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  159. Discretization Schemes of Advection Term in the Finite Element Method for Incompressible Navier-Stokes Equation Reviewed

    Uchiyama, T.

    J. Applied Mechanics and Engineering   Vol. 3 ( 1 ) page: 39-53   1998

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  160. Stochastic Features of Pressures Detected by a Vortex Generator- Applicability to Measurement of Indivisual Phase Flow Rates of Gas-Liquid Flow - Reviewed

    Minemura, K., Takabe, S., Uchiyama, T., Shoda, S., Yamashita, M., Ogawa, Y., Tanimoto, J.

    Proc. 3rd Int. Conf. Multiphase Flow     page: 577   1998

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  161. Upstream Finite Element Method for an Incompressible Two-Fluid Model Reviewed

    Uchiyama, T., Minemura, K.

    Proc. 3rd Int. Conf. Multiphase Flow     page: 138   1998

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  162. Finite Element Method for Gan-Liquid Two-phase Flow Based on an Incompressible Two-Fluid Model Reviewed

    Uchiyama, T., Minemura, K.

    Computer Modeling and Simulation in Engineering   Vol. 2 ( 1 ) page: 23-37   1997

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  163. Finite Element Method for Incompressible Two-Fluid Model Using a Fractional Step Method Reviewed

    The Japan Soiety of Multiphase Flow   Vol. 11 ( 2 ) page: 141-150   1997

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  164. Large Eddy Simulation by the Finite Element Method Using Multi-Pass Algorithm Reviewed

    Tomomi Uchiyama

    Proc. Int. Conf. on Fluid Engineering   Vol. 3   page: 1284-1288   1997

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  165. Stability Analysis of the Finite Element Method for Two-Fluid Model Reviewed

    Uchiyama, T.

    Proc. ISAC'97 High Performance Computing on Multiphase Flows     page: 139-144   1997

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  166. Large Eddy Simulation of Turbulent Flow by the Finite Element Method Reviewed

    Fluid and Heat Engineering Research   Vol. 32 ( 1 ) page: 15-25   1997

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  167. Prediction of Gas-Liquid Two-phase Flow Performance of a Centrifugal Pump Using a One-Dimensional Two-Fluid Model Reviewed

    Trans an Towo of the Japan Society of Mechamical Engineers   Vol. 63 ( 611 ) page: 2377-2385   1997

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  168. Finite Element Method for Gas-Liquid Two-Phase Flow Using a Fractional Step Method Reviewed

    Uchiyama, T., Minemura, K.

    Proc. 2nd Japanese-German Symp. on Multi-Phase Flow,     page: 289-300   1997

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  169. Numerical Analysis of an Incompressible Two-Fluid Model by Finite Element Method based on a Fractional Step Method Reviewed

    Uchiyama, T.

    Computer Modeling and Simulation in Engineering   Vol. 2 ( 4 ) page: 363-385   1997

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  170. Discretization Schemes of the Finite Element Method for Advection Terms of an Incompressible Two-Fluid Model Reviewed

    Uchiyama, T.

    Computer Modeling and Simulation in Engineering   Vol. 2 ( 2 ) page: 145-161   1997

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  171. Numerical Prediction of Cavitating Flow by the Finite Element Method Reviewed

    Uchiyama, T.

    Proc. Int. Conf. on Fluid Engineering   Vol. 1   page: 449-454   1997

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  172. Prediction of Gas-Liquid Two-Phase Flow Performance of a Centrifugal Pump Based on One-Dimensional Two-Fluid Model Reviewed

    Minemura, K., Uchiyama, T., Kinoshita, K., Liu, L., Shoda, S., Egashira, K.

    Proc. Int. Conf. on Fluid Engineering   Vol. 1 ( 1 ) page: 467-472   1997

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  173. Numerical Amalysis of Incompressible Two-Fouid Model by Finit Element Method (Numerical Method and Calculation of Flow around a Circular Cylinder) Reviewed

    Transaction of the Japan Society of Mechanical Engineers.   Vol. 62 ( 595 ) page: 977-984   1996

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  174. Numerical Prediction of Developing Turbulent Bubbly Flow in a Rotating Square-Sectioned Duct Reviewed

    Transaition of the Japan Soiety of Mechaical Eugirors   Vol. 62 ( 603 ) page: 3784-3791   1996

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  175. Numerical Simulation of Bubbly Flows in a Rotating Straight Channel Reviewed

    Uchiyama, T., Minemura, K., Wu, J., Emura, T.

    Proceeding of Int. Sympo. on Fluid Machinery and Fluid Engineering     page: 131-138   1996

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  176. Study on Discretization of Convective Terms in Finite Element Method for Incompressible Two-Fluid Model Reviewed

    Uchiyama, T.

    Proc. The Second Asian Computational Fluid Dynamics Conference     page: 529-534   1996

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  177. Numerical Prediction of Erosion Wear on Pump Casing under Solid-Water Two-phase Flow Conditions Reviewed

    Transaction of the Japan Society of Mechanical Engineers   Vol. 61 ( 587 ) page: 2571-2578   1995

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  178. Knowledge-Based Fault Diagnosis for Pump Stations by Process Modeling Reviewed

    Uchiyama, T. Kallweit, S., Siekmann, H.

    Proceedings of Fluid Machinery Forum     page: 117-121   1995

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  179. Finite Element Analysis of Incompressible Two-Fluid Model Reviewed

    Uchiyama, T.

    Proceeding of Cavitation and Multi-Phase Flow Forum     page: 115-119   1995

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  180. Three-Dimensional Calculation of Air-Water Two-Phase Flow in a Centrifugal Pump Based on a Bubbly Flow Model with Fixed Cavity Reviewed

    Minemura, K., Uchiyama, T.

    JSME International, Series B   Vol. 37 ( 4 ) page: 726-735   1994

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  181. Numerical Simulation of Bubbly Flows in a Rotating Straight Channel Using Reynolds Stress Based on a Mixing Length Theory Reviewed

    Transaction of the Japan Society of Mechanical Engineers   Vol. 60 ( 577 ) page: 2967-2975   1994

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  182. Flow Visualization in a Cavitating Flow Reviewed

    Dues, M., Gebhardt, A., Kallweit, S., Scheffler, T., Siekmann, H., Uchiyama, T.

    Proceedings of the German-Japanese Symposium on Multi-Phase Flow     page: 391-402   1994

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  183. Numerical Prediction of Two-Phase-Flow Pump Performance by a Bubbly Flow Model with Fixed Cavity(Effects of Outlet Blade Angle and Rotational Speed) Reviewed

    Transaction of the Japan Society of Mechanical Engineers   Vol. 60 ( 571 ) page: 920-925   1994

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  184. Numerical Prediction of Two-Phase-Flow Pump Performance by a Bubbly Flow Model with Fixed Cavity Reviewed

    K. Minemura and T. Uchiyama

    Proc. German-Japanese Symposium on Multi-Phase Flow     page: 403-417   1994

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  185. Experimental Investigations on Bubbly Flows in a Straight Channel Rotated Around Axis Perpendicular to the Channel Reviewed

    Minemura, K., Uchiyama, T., Ishikawa, T.

    International Journal of Multiphase Flow   Vol. 19 ( 3 ) page: 439-450   1993

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  186. Three-Dimensional Calculation of Air-Water Two-Phase Flow in Centrifugal Pump Impeller Based on a Bubbly Flow Model Reviewed

    Minemura, K., Uchiyama, T.

    Transaction of ASME, Journal of Fluids Engineering   Vol. 115 ( 4 ) page: 766-771   1993

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  187. Prediction of Pump Performance Under Air-Water Two-Phase Flow Based on a Bubbly Flow Model Reviewed

    Minemura, K., Uchiyama, T.

    Transaction of ASME, Journal of Fluids Engineering   Vol. 115 ( 4 ) page: 781-783   1993

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  188. 離散点で傾きが与えられたときの双一次パッチによる曲面形状決定法(共著) Reviewed

    内山知実,峯村吉泰

    図学研究   ( 61 ) page: 3-8   1993

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  189. Three-Dimensional Calculation of Air-Water Two-Phase Flows in a Centrifugal Pump Based on a Bubbly Flow Model with Fixed Cavity Reviewed

    Transactions of the Japan Society of Mechanical Engineers   Vol. 58 ( 550 ) page: 1803-1810   1992

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  190. Numerical Quadratures of First-Order Partial Derivatives Given on Discrete Points (Least Squares Method utilizing FEM Shape Function or Finite Difference Approximation) Reviewed

    Transactions of the Japan Society of Mechanical Engineers   Vol. 58 ( 550 ) page: 1747-1752   1992

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  191. Characteristics of Bubbly Flows in a Rotating Radial Duct Reviewed

    Transactions of the Japan Society of Mechanical Engineers   Vol. 57 ( 542 ) page: 3317-3324   1991

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  192. Simplex Finite Element Analysis for Cascade Flows Satisfying the Kutta Condition(共著) Reviewed

    Minemura, K., Uchiyama, T.

    Proceeding of Fluid Machinery Forum     page: 65-69   1991

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  193. Calculation of Two-phase Flow Pump Performance by a Bubbly Flow Model with Fixed Cavity Reviewed

    Minemura, K., Uchiyama, T.

    Proceeding of Cavitation and Multiphase Flow Forum     page: 131-134   1991

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  194. Calculation of the three-dimensional behaviour of spherical solid particles entrained in a radial-flow impeller pump Reviewed

    Minemura, K., Uchiyama, T.

    Journal of Mechanical Engineering Science   Vol. 204   page: 159-168   1990

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  195. Simplex Finite Element Analysis for a Region Enclosed with Curved Boundaries Specifying the Boundary Condition of the Second Kind(1st Report, Reduction Effects in Number of Nodes) Reviewed

    Transaction of the Japan Society of Mechanical Engineers   Vol. 56 ( 531 ) page: 3343-3350   1990

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  196. Simplex Finite Element Analysis for a Region Enclosed with Curved Boundaries Specifying the Boundary Condition of the Second Kind(2nd Report, Application to Two-Dimensional Cascade Flows) Reviewed

    内山知実,峯村吉泰

    Transaction of the Japan Society of Mechanical Engineers   Vol. 56 ( 531 ) page: 3351-3359   1990

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  197. Three-Dimensional Calculation of Air-Water Two-Phase Flow in Centrifugal Pump Impeller Based on a Bubbly Flow Model(1st Report, Distributions of Pressure and Void Fraction) Reviewed

    Transaction of the Japan Society of Mechanical Engineers   Vol. 55 ( 516 ) page: 2364-2373   1989

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  198. Three-Dimensional Calculation of Air-Water Two-Phase Flow in Centrifuge Pump Impeller Based on a Bubbly Flow Model(2nd Report, Prediction of Pump Performance) Reviewed

    Transaction of the Japan Society of Mechanical Engineers   Vol. 55 ( 516 ) page: 2374-2382   1989

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  199. Three-Dimensional Numerical Solutions of Water Flows in a Screw-Tyhpe Centrifugal Pump and Movements of Entrained Particles Reviewed

    Transactions of the Japan Society of Mechanical Engineers   Vol. 55 ( 520 ) page: 3636-3642   1989

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  200. Interactive Pattern-Making for Dress or Suit Based on Measurements of a Body Form Reviewed

    Journal of Japan Society for Design Engineering   Vol. 24 ( 10 ) page: 370-375   1989

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  201. Interactive Pattern-Making for Men's or Women's Garments Based on Measurements of a Body Form Reviewed

    Minemura, K., Uchiyama, T., Wang, D.

    Proceedings of 2nd International Conference on Computer Aided Drafting Design and Manufacturing Technology     page: 349-354   1989

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  202. History Effects on Bubble Movements around Body with Ogire Nose Reviewed

    Transaction of the Japan Society of Mechanical Engineers   Vol. 54 ( 502 ) page: 1325-1331   1988

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  203. Flow of Cavitation Bubbles in a Centrifugal Pump Impeller Reviewed

    Minemura, K., Murakami, M., Uchiyama, T.

    Japan Society of Mechanical Engineers, International Journal Series. II   Vol. 31 ( 1 ) page: 30-38   1988

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  204. Movements of Solid Particles in a Radial-Flow Pump Impeller(2nd Report, Behavior of a Three-Dimensional Potential Flow Field) Reviewed

    Transaction of the Japan Society of Mechanical Engineers   Vol. 53 ( 490 ) page: 1677-1684   1987

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  205. Behavior of Cavitation Bubbles in a Centrifugal Pump Impeller Reviewed

    Transaction of the Japan Society of Mechanical Engineers   Vol. 53 ( 491 ) page: 1878-1886   1987

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  206. Theoretical Analysis of Cavitation Bubble Behavior in a Radial - flow Impeller Reviewed

    Minemura, K., Murakami, M., Kikuyama, K., Uchiyama, T., Sawada, S.

    Proceeding of International Symposium on Cavitation     page: 281-286   1986

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  207. Development of an undershot cross-flow hydraulic turbine resistant to snow and ice masses flowing in an installation canal

    Satou E., Ikeda T., Uchiyama T., Okayama T., Miyazawa T., Takamure K., Tsunashima D.

    Renewable Energy   Vol. 200   page: 146 - 153   2022.11

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    This study developed a microhydraulic turbine that can stably and efficiently generate electricity even in canals where snow and ice masses frequently flow down. An undershot cross-flow hydraulic turbine was selected as the development target, and experiments were conducted in an irrigation canal in a heavy snowfall area. Spherical snowballs were made to flow down to the turbine from the upstream direction. The behavior of the snowballs and the power generation performance were investigated as these snowballs passed through the rotor. When the diameter of the snowball is smaller than the blade interval of the rotor, the snowball passing through the rotor causes a small decrease in power output. In contrast, when the diameter of the snowball is larger than the blade interval, the snowball is entrained between the rotor and canal bottom, temporarily stopping the rotor, and resulting in a large decrease in power generation. These results suggest that an undershot cross-flow hydraulic turbine can reduce power generation performance due to snow and ice masses when its blade interval is larger than the expected size of the snow and ice masses. This study developed some design guidelines for this turbine that are highly adaptable to snow- and ice-flowing irrigation canals.

    DOI: 10.1016/j.renene.2022.09.062

    Scopus

  208. Effect of cone on efficiency improvement of a self-powered IoT-based hydro turbine

    Takamure Kotaro, Uchiyama Tomomi, Horie Kosuke, Nakayama Hiroshi

    ADVANCES IN MECHANICAL ENGINEERING   Vol. 14 ( 7 )   2022.7

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    DOI: 10.1177/16878132221107249

    Web of Science

  209. Blocking effect of desktop air curtain on aerosols in exhaled breath

    Takamure Kotaro, Sakamoto Yasuaki, Yagi Tetsuya, Iwatani Yasumasa, Amano Hiroshi, Uchiyama Tomomi

    AIP ADVANCES   Vol. 12 ( 5 )   2022.5

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    A desktop-type air curtain system (DACS) capable of being installed on a desk to protect healthcare workers from infectious diseases was developed. Pseudo-exhaled air containing aerosol particles emitted from a mannequin was blown toward the air curtain generated by the DACS. The aerosol blocking effect of the DACS was investigated using particle image velocimetry measurements. A scenario in which the arm of a patient in the blood collection room is placed on the gate of the DACS was also investigated. Air curtain flow was maintained inside the gate of the DACS. The aerosol particles approaching the DACS were observed to bend abruptly toward the suction port without passing through the gate, signifying that the aerosol particles were blocked by the air curtain flow. When the arm of the patient was placed on the gate of the DACS during blood collection, the airflow above the arm was disrupted. However, the aerosol blocking performance remained unaffected. We envisage that this system will be useful as an indirect barrier not only in the medical field but also in situations where sufficient physical distance cannot be maintained, such as at the reception counter.

    DOI: 10.1063/5.0086659

    Web of Science

    Scopus

  210. Numerical analysis of effect of Reynolds number on interaction of density-stratified fluid with a vortex ring

    Cao Lile, Takamure Kotaro, Uchiyama Tomomi

    PHYSICS OF FLUIDS   Vol. 34 ( 5 )   2022.5

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    In this study, the effect of Reynolds number (Re) on the mixing process of a two-layer density-stratified fluid, caused by the interaction between a vortex ring and the density interface, was numerically investigated using an improved vortex-in-cell method. The density-stratified fluid consisted of water (upper layer) and an aqueous sodium chloride solution (lower layer). Re of the simulated vortex ring was varied from 644 to 1932. We numerically investigated the behavior of the vortex ring and density-stratified fluid, and compared the same with that from a previously conducted experimental study from the literature. The vortex structure generated during the interaction was visualized in three dimensions. Furthermore, the mixing process was evaluated in terms of the stirring index, gradient of concentration, and stirring efficiency. The mixing behavior of the vortex ring was a function of the interaction pattern. For example, for a large Re, with the penetrative pattern, the stirring efficiency reached a constant value that was smaller than that from the partially penetrative pattern. The results showed that a strong stirring caused by an increase in Re of the vortex ring would not always lead to effective mixing.

    DOI: 10.1063/5.0086096

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  211. The Wake Characteristics of a Sphere with a Uniaxial Through-hole in a Uniform Flow

    KATO Hayato, TAKAMURE Kotaro, UCHIYAMA Tomomi

    Journal of Wind Engineering   Vol. 47 ( 1 ) page: 1 - 4   2022

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Association for Wind Engineering  

    DOI: 10.5359/JWE.47.1

    Scopus

    CiNii Research

  212. Falling behavior of hollow particle with uniaxial through-hole: A case study using experiments and numerical simulations

    Takamure K., Tanaka J., Kato H., Uchiyama T.

    POWDER TECHNOLOGY   Vol. 392   page: 367 - 374   2021.11

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    In this study, experiments and numerical simulations are performed where a hollow particle with a uniaxial through–hole is dropped freely in water, and its behavior is investigated. The distribution of falling particle trajectories reveals significant deviation in the direction perpendicular to the through–hole of the particle. In addition, the pressure distribution at the particle surface and the vorticity field of the wake of the particle are distributed asymmetrically in the plane perpendicular to the through–hole of the particle. Conversely, this pressure distribution and vorticity field are distributed symmetrically with respect to the direction parallel to the through–hole of the particle. Thus, this study clarifies that the movement of the particle in the direction parallel to the through–hole is suppressed. These results provide valuable novel insights into the control of particle motion.

    DOI: 10.1016/j.powtec.2021.07.020

    Web of Science

    Scopus

  213. Effect of Froude number on the motion of a spherical particle launched vertically upward in water

    Takamure K., Uchiyama T.

    EXPERIMENTAL THERMAL AND FLUID SCIENCE   Vol. 128   2021.10

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    A spherical particle with a diameter of 25.4 mm and density of 2640 kg/m3 was launched vertically upward toward the free surface of calm water. The Froude number of the particle passing through the water surface was varied. The dependence of the Froude number on the particle motion and water surface behavior was investigated from the instant the particle crossed the water surface until it attained its maximum displacement position. Based on the classical energy conservation law, the energy lost in the interaction between the particle and water surface (i.e., interface containing energy, Eo) was estimated. Eo was found to increase with the increase in the Froude number when the particle crossed the water surface. In addition, owing to Eo at the maximum displacement position of the spherical particle, the height and width of the interfacial water sheet changed by the same ratio at the point of intersection of the upper side of the particle with the calm water surface. This result was in agreement with that obtained by changing the submergence depth, as reported by Takamure and Uchiyama (2020). This finding suggests that the characteristics of the interfacial water sheet are the dominant parameters influencing the interface containing energy. The presented findings can help determine the parameters to model the water exit problem.

    DOI: 10.1016/j.expthermflusci.2021.110453

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  214. Behavior of a solid sphere launched vertically upwards in water and its interaction with the air-water interface

    Takamure K., Uchiyama T.

    OCEAN ENGINEERING   Vol. 235   2021.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Ocean Engineering  

    An experiment was conducted in which a solid sphere with a density of 1,875 kg/m3 and diameter of 24.8 mm was launched vertically upwards in water towards the air–water interface. By changing the Reynolds number, Re, based on the launch velocity, the motion of the sphere due to interference with the air–water interface was investigated along with the behavior of the interface. The experimental results of the sphere's vertical position in water agree with the theoretical values. However, in air, the experimental results gave lower vertical positions than the theoretical values. When the Reynolds number where the sphere reaches the air–water interface is Rew1¯=0.2×103, the vertical trajectory of the sphere branches above and below the ensemble average immediately after passing the air–water interface. This difference in bifurcation does not depend on the Reynolds number in water. However, no branching occurs when Rew1¯ is large. There is an inverse relationship between the asymmetry of the air–water interface that occurs when the sphere passes through the interface and the sphere's maximum displacement. It was shown that the energy loss of the sphere and the asymmetry of the air–water interface have a linear relationship in all cases with different Reynolds numbers. This means that there is a invariant relationship between the energy lost by the sphere passing through the air–water interface and the asymmetry of the interface.

    DOI: 10.1016/j.oceaneng.2021.109282

    Web of Science

    Scopus

  215. Falling of a Spherical Particle in Fine-Bubble Plume and Fine-Bubble Behavior around the Particle

    Takamure K., Kawasaki Y., Degawa T., Uchiyama T.

    FLUID DYNAMICS   Vol. 56 ( 5 ) page: 612 - 621   2021.9

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Fluid Dynamics  

    Abstract—: In this study, the interaction between a spherical solid particle descending in a fine-bubble plume and the fine-bubbles around the particle is investigated experimentally. The fine-bubbles, which are formed by water electrolysis and have an average diameter of 0.037 mm, rise via buoyancy to form bubble plumes. The average bubble velocity in the conduit is 0.05 mm/s. A spherical solid particle with a diameter of 11.1 mm and a density of 1130 kg/m3 is dropped into the fully-developed bubble plume. The particle falls in a meandering motion in the fine-bubble plume. In this process, the terminal velocity of the particles falling in the fine-bubble plume is almost identical to that of a particle falling in the quiescent water. Additionally, after the fine-bubbles have been separated from the particle surface, they flow into the wake of the particle, forming a stagnant region. The particle wake diameter increases threefold, as compared with its value in the downstream direction of the fine-bubble plume.

    DOI: 10.1134/S001546282105013X

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  216. Mixing of a two-layer density-stratified fluid by two vortex rings successively launched toward the density interface

    Cao Lile, Takamure Kotaro, Degawa Tomohiro, Uchiyama Tomomi

    JOURNAL OF VISUALIZATION   Vol. 24 ( 4 ) page: 683 - 697   2021.8

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    Abstract: In this study, two vortex rings composed of upper fluid were continuously ejected vertically downward toward the interface of the two-layer density-stratified fluid. The motion of the vortex rings and behavior of the lower layer fluid were investigated via visualization experiment, and the effect of time interval between the injections of the two vortex rings on the mixing of the density-stratified fluid was investigated. The first emitted vortex ring (VRA) advected vertically downward in the upper layer, passed through the density interface, and then advected in the lower layer. After VRA reached the maximum depth in the lower layer, the upper part of the fluid mass ejected into the upper layer due to buoyancy. The lower fluid was entrained in the upper layer. Subsequently, a new vortex ring (VRC) was generated by the fluid mass ejected in the upper layer and advected vertically upward in the upper layer. The second vortex ring emitted (VRB) collided with the tip of the fluid mass of the VRA ejected from the lower layer. Subsequently, it slightly penetrated the lower layer, rolled up the lower layer fluid into the upper layer, and coalesced with VRC to collapse. In the process of vortex merging, the mixing of the upper and lower layers reached a maximum when the VRA reached the maximum depth. Furthermore, it was clarified that the mixing ability of the upper and lower layers depends on the ejection time interval of the two vortex rings. Graphic abstract: [Figure not available: see fulltext.]

    DOI: 10.1007/s12650-020-00738-8

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  217. Vortex-in-cell simulation of the flow and performance of a Savonius hydraulic turbine with S-shaped blades

    Takamure Kotaro, Wang Haotian, Uchiyama Tomomi, Iio Shouichiro, Ikeda Toshihiko

    JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY   Vol. 13 ( 4 )   2021.7

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Journal of Renewable and Sustainable Energy  

    The volume penalization vortex-in-cell (VP-VIC) method, which combines the vortex-in-cell and vortex penalization methods, is a kind of immersed boundary method that has the advantage of accurately calculating the vorticity field near the boundary. It is expected to be used as a design tool for shape optimization. In this study, the flow and performance of a small Savonius turbine rotor (rotor diameter DR = 245 mm) with S-shaped blades, which is used for small-scale distributed power generation with output less than 100 kW, were analyzed by numerical simulation. The results were compared with those of previous experimental studies to examine the usefulness of the VP-VIC method for fluid analysis around the Savonius turbine. The Reynolds number (Re=U0DR/ν) based on the streamwise velocity U0 is 1.32×105. The volume penalization vortex-in-cell (VP-VIC) method is applied for flow simulation, and the rotational motion of the rotor is analyzed using the calculation method previously proposed by the authors for the fluid force acting on the solid boundary (blade surface). As a result, the relationship between the rotational speed of the rotor and the output coefficient obtained in this simulation is similar in the experimental results of Golecha et al. [Appl. Energy 88, 3027-3217 (2011)] using S-shaped blades. In particular, with an increase in the load torque, the rotational speed of the rotor decreases, and the rotor stops momentarily. When the rotor stops, the positive torque of clockwise rotation acts on the advancing blade, while the negative torque of counterclockwise rotation acting on the returning blade decreases; hence, the rotor restarts immediately after stopping. In addition, it is established that the rotor output can be accurately predicted. Based on the above, it is reconfirmed that the VP-VIC method is beneficial for predicting the performance of a Savonius turbine.

    DOI: 10.1063/5.0051203

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  218. Development of a self-powered wireless sensor node to measure the water flowrate by using a turbine flowmeter

    Uchiyama Tomomi, Takamure Kotaro, Okuno Yuta, Sato Eiichi

    INTERNET OF THINGS   Vol. 13   2021.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Internet of Things (Netherlands)  

    A self-powered wireless sensor node was developed to measure the water flowrate. It is composed of a turbine flowmeter and an IoT control unit. The turbine flowmeter generates electric power from the rotation of the rotor. The IoT control unit, consisting of a microcomputer and a low power wide area (LPWA) communication module, uses the power generated by the rotor rotation to detect the rotational speed of the rotor (the water flowrate) and to communicate wirelessly with a server on the Internet. Experiments were also conducted to evaluate the performance of the sensor node. The power generated by the rotor rotation was sufficient to operate the wireless sensor node as a self-powered unit. The full-scale accuracy and indication accuracy of the measured flowrate were 1.2% and 2.8%, respectively. The wireless sensor node could stably upload the measured flowrate to a server on the Internet.

    DOI: 10.1016/j.iot.2020.100327

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  219. Motion of a Solid Sphere Launched Vertically Upward in Water and Deformation of Water Surface by the Sphere

    Takamure K., Uchiyama T.

    Lecture Notes in Mechanical Engineering     page: 159 - 166   2021

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    A solid sphere is launched vertically upward from water toward the air–water interface, and the modulation of the sphere’s motion and the behavior of the air–water interface induced by the sphere are investigated. Spheres with three different densities ρp are used: the almina sphere (ρp = 3900 kg/m3), teflon sphere (ρp = 2180 kg/m3), and duracon sphere (ρp = 1360 kg/m3). Through a visualization experiment on the motion of a sphere in water, it was demonstrated that the launch velocity of the sphere can be set with high accuracy. When the sphere passes through the air–water interface, it forms a complex interface while entraining water. Additionally, spheres with small ρp were demonstrated to not always vertically collide with the air–water interface; this causes different behaviors of the spheres in the air.

    DOI: 10.1007/978-981-15-5183-3_17

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  220. Improvement of Power Generation Efficiency of Self-powered Turbine Flowmeter with NACA airfoil Shaped Blades

    SAKAMOTO Yasuaki, UCHIYAMA Tomomi, TAKAMURE Kotaro, NAKAYAMA Hiroshi

    The Proceedings of the Fluids engineering conference   Vol. 2021 ( 0 ) page: OS03-15   2021

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    <p>The purpose of this study is to improve the power generation efficiency of the self-powered turbine flowmeter developed by the authors. To increase the efficiency, the NACA airfoil was applied to the blade of the rotor. It was shown that the efficiency is favorably improved over the entire range of the flowrate by using the NACA airfoil blade.</p>

    DOI: 10.1299/jsmefed.2021.os03-15

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  221. Flow Characteristics of Cavitating Jet through a Rectangular Orifice with Different Aspect Ratios

    TERAKWA Kohei, IIO Shouichiro, TAKAMURE Kotaro, UCHIYAMA Tomomi

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   Vol. 2021.58 ( 0 ) page: F021   2021

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    <p>A spool valve for water hydraulics, Aqua Drive System (ADS), which uses tap water, has some rectangular openings at control ports for precise control because of the low viscosity of the water. In the valve, cavitation happens quickly, and it occurs some troubles, e. g. noise and vibration, erosion, degradation of controllability. This study focuses on cavitation behavior and cavitation-related noise and pressure-flow rate characteristics of a rectangular orifice. Jet flow behavior issuing from a rectangular orifice strongly depends on its aspect ratio. So, cavitation could be affected by the aspect ratio. However, there is little knowledge of the relationships between the aspect ratio and cavitation noise or pressure-flow rate. This research investigates the aspect ratio influence on cavitation, noise, and pressure-flow rate characteristics with different pressure conditions. The equivalent diameter of the orifice used in this study is from 0.35 to 1.3mm, and it is based on a product spool valve model. As a result, the cavitation jet behavior changes with the orifice aspect ratio and the ambient pressure. But the noise characteristics show the almost same tendency for different aspect ratio.</p>

    DOI: 10.1299/jsmehs.2021.58.f021

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  222. Visualization and Flow Characteristics of a Cavitating Jet from a Rectangular Orifice with Various Aspect Ratios

    TAKEI Hironori, TERAKAWA Kohei, IIO Shouichiro, TAKAMURE Kotaro, UCHIYAMA Tomomi, YOSHIDA Futoshi

    The Proceedings of the Fluids engineering conference   Vol. 2021 ( 0 ) page: OS03-20   2021

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    <p>This study focused on the characteristics of a cavitating jet issuing from a small rectangular orifice with different aspect ratios. The orifice size is similar to the control port in a water hydraulic spool valve. The authors conducted the flow visualization to capture the overall and cross-sectional jet images. The maximum Reynolds number based on the equivalent diameter is approximately 1.3×10<sup>5</sup>. The results show that cavitation bubbles generate in the jet shear layer and just downstream the jet exit. The shape of the cavitation region varies with the streamwise position except for the two-dimensional orifice having an aspect ratio (AR) of 38.3. In the square orifice, the cavitation region rotates at 45 degrees from the jet exit like an axis switching. The cavitation region in the jet of AR=6.76 deforms from the rectangular shape. On the other hand, under the large aspect ratio condition, the shape of the cavitation region is maintained relatively downstream.</p>

    DOI: 10.1299/jsmefed.2021.os03-20

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  223. Effect of initial angle of through-hole of sphere on the motion of a sphere launched vertically in water

    TAKAMURE Kotaro, UCHIYAMA Tomomi

    The Proceedings of the Fluids engineering conference   Vol. 2021 ( 0 ) page: OS03-04   2021

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    <p>A sphere with a uniaxial through-hole of 6mm with a sphere diameter of 25.4 mm and density of 1360 kg/m<sup>3</sup> was launched vertically upward toward the free surface of calm water. The effect of initial angle of the uniaxial through-hole was investigated from the time the sphere passed through the calm water surface until it attained its maximum displacement position. When uniaxial through-hole of the sphere and the water surface are horizontal, a slight rotation occurs in the sphere that rises in the water. As the initial angle of the uniaxial through-hole increases, the sphere over the water surface deviates greatly from the central axis.</p>

    DOI: 10.1299/jsmefed.2021.os03-04

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  224. Characteristics of the wake of a sphere with a uniaxial through hole in uniform flow

    KATO Hayato, TAKAMURE Kotaro, UCHIYAMA Tomomi

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2021 ( 0 ) page: S051-09   2021

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    <p>In this study, we investigated the characteristics of the wake of a sphere with a uniaxial through-hole.The sphere diameter was 25.4 mm, and the through-hole diameter was 6 mm. The sphere was placed in a uniform flow so that the through-hole is perpendicular to the streamwise direction. The Reynolds number based on the sphere diameter and the uniform flow velocity was 12,000. The flow velocity was measured by a hot-wire anemometer. As a result, the velocity defect of the sphere was smaller than that of a sphere without such through-hole. However, the significant differences were hardly observed as the flow moves toward the downstream direction.</p>

    DOI: 10.1299/jsmemecj.2021.s051-09

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  225. Development of a self-powered wireless sensor node measuring water flowrate using a turbine flowmeter

    SAKAMOTO Yasuaki, UCHIYAMA Tomomi, TAKAMURE Kotaro, OKUNO Yuta, SATO Eiichi, NAKAYAMA Hiroshi, OSA Noburo, MATSUMOTO Hiroyuki

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2021 ( 0 ) page: S144-01   2021

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    <p>A self-powered wireless sensor node was developed to measure the water flowrate. It is composed of a turbine flowmeter and an IoT control unit. The IoT control unit, consisting of a microcomputer and a low power wide area communication module, uses the power generated by the rotor rotation to detect the rotational speed of the rotor (the water flowrate) and to communicate wirelessly with a server on the Internet. Experiments were also conducted to evaluate the performance of the sensor node. The power generated by the rotor rotation was sufficient to operate the wireless sensor node as a self-powered unit. The full-scale accuracy and indication accuracy of the measured flowrate were 1.2 % and 2.8 %, respectively. The wireless sensor node could stably upload the measured flowrate to a server on the Internet.</p>

    DOI: 10.1299/jsmemecj.2021.s144-01

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  226. Effect of density of a sphere launched vertically in water on the water-surface behavior and sphere motion in air

    Takamure K., Uchiyama T.

    PHYSICS OF FLUIDS   Vol. 32 ( 11 )   2020.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Physics of Fluids  

    Submerged solid spheres with specific gravities relative to water ranging from 1.36 to 7.93 were launched vertically upward toward the free surface of calm water. The motion of each sphere and the behavior of the water surface were investigated from the time the sphere passed through the calm water surface until it attained its maximum displacement position. The energy lost in the interaction between the sphere and the water surface (i.e., the interfacial containing energy Eo) was estimated from energy conservation. A larger Eo at the maximum displacement position of the sphere led to a larger increase in the height and width of the interfacial water sheet where the upper side of the sphere intersected with the free surface of calm water. This result corresponded to the result obtained by changing the submergence depth, as reported by Takamure and Uchiyama ["Air-water interface dynamics and energy transition in air of a sphere passed vertically upward through the interface,"Exp. Therm. Fluid Sci. 118, 110167 (2020)]. This aspect suggests that the characteristics of the interfacial water sheet are the dominant parameters influencing Eo. The presented findings can facilitate the determination of parameters to model the water exit problem.

    DOI: 10.1063/5.0024032

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  227. Dynamics of a sphere launched vertically in water

    Takamure K., Uchiyama T.

    POWDER TECHNOLOGY   Vol. 372   page: 246 - 257   2020.7

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    DOI: 10.1016/j.powtec.2020.05.091

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  228. Effect of cylinders on the characteristics of a fine-bubble plume

    TAKAMURE Kotaro, DEGAWA Tomohiro, KANO Ryota, UCHIYAMA Tomomi

    Journal of Fluid Science and Technology   Vol. 15 ( 3 ) page: JFST0019 - JFST0019   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    <p>The characteristics of a fine-bubble plume passing through two tandem cylinders are investigated. Fine-bubbles with a mean diameter of 0.055 mm are released by water electrolysis from electrodes placed at the bottom of a tank. They induce an upward water flow around them with rising due to buoyancy. Orthogonally to the axis of such fine–bubble plume, two cylinders with a diameter <i>D</i> of 30 mm are arranged in tandem. The distance between the cylinders, <i>L</i>, ranges between 1.5<i>D</i> and 3<i>D</i>. This study visualizes the bubbles and water flow around the cylinders. It also measures the bubble velocity distribution. The experiments reveal the water and bubble shear layers originating at the sides of the lower cylinder and make clear their behavior around the upper cylinder. This study elucidates the effects of <i>L</i> on the characteristics of the fine-bubble plume, such as the stagnant bubbly flow and the bubbly wake around the cylinders.</p>

    DOI: 10.1299/JFST.2020JFST0019

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  229. Numerical simulation of the flow and performance of a Savonius hydraulic turbine provided with a shield plate

    TAKAMURE Kotaro, GU Qiang, DEGAWA Tomohiro, UCHIYAMA Tomomi, IIO Shouichiro, IKEDA Toshihiko

    Transactions of the JSME (in Japanese)   Vol. 86 ( 887 ) page: 20-00181 - 20-00181   2020

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    <p>The flow and performance of a rotor of a Savonius hydraulic turbine provided with a shield plate were analyzed by the two-dimensional simulations. The rotor diameter <i>D<sub>R</sub></i> is 142 mm, and the Reynolds number based on the velocity of the main flow <i>U</i><sub>0</sub>, <i>U</i><sub>0</sub><i>D<sub>R</sub></i>/<i>ν</i>, is 1.1×10<sup>5</sup>. The shield plate with a length of 0.5<i>D<sub>R</sub></i> is installed upstream of the rotor, perpendicular to the main flow. The comparative experimental studies have visualized the flow and clarified that the shield plate increases the power output of the rotor. The vortex in cell method combined with the volume penalization method was applied to the flow simulation, and the torque acting on the rotor was computed with a custom method by the authors. The simulated flows around the shield plate and rotor agreed with the experimentally visualized ones. The simulation successfully revealed the effect of the shield plate on the flow and power output of the rotor. These demonstrate the applicability of the present simulation method for the performance prediction of the rotor of Savonius hydraulic turbines provided with a shield plate.</p>

    DOI: 10.1299/transjsme.20-00181

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  230. Effect of the sphere density on motion in air of a sphere launched vertically in water and behavior of air-water interface

    TAKAMURE Kotaro, Uchiyama Tomomi

    The Proceedings of the Fluids engineering conference   Vol. 2020 ( 0 ) page: OS03-10 - 10   2020

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    DOI: 10.1299/jsmefed.2020.os03-10

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  231. Effect of uniaxial through hole on the falling behavior of hollow and solid spheres in water

    TANAKA Junki, KATO Kaede, TAKAMURE Kotaro, UCHIYAMA Tomomi

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2020 ( 0 ) page: S05129   2020

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    DOI: 10.1299/jsmemecj.2020.s05129

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  232. Energy transition of a sphere launched upward from stationary water toward air

    TAKAMURE Kotaro, Uchiyama Tomomi

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2020 ( 0 ) page: S05110   2020

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    <p>In a present experiment, a solid sphere with a density of 2600 kg/m<sup>3</sup> and diameter of 25.4 mm was launched vertically upward in water toward the air-water interface. The submergence depth was changed and the launch velocity was adjusted so that the Reynolds number of the sphere immediately after passing the air-water interface was almost equal at each submergence depth. The energy ratio <i>E<sub>p</sub></i>/<i>E<sub>k</sub></i> was defined as the ratio of the kinetic energy <i>E<sub>k</sub></i> of the sphere immediately after it passed through the air-water interface to the potential energy <i>E<sub>p</sub></i> when the sphere reached the maximum displacement position. <i>E<sub>p</sub></i>/<i>E<sub>k</sub></i> decreased when the submergence depth was <i>H<sub></sub></i>/<i>d<sub></sub></i> < 3. However, it had a constant value of <i>E<sub>p</sub></i>/<i>E<sub>k</sub></i> ~ 0.57 when the submergence depth was <i>H<sub></sub></i>/<i>d<sub></sub></i> ≥ 3. In addition, when the submergence depth was <i>H<sub></sub></i>/<i>d<sub></sub></i> ≥ 3, the ratio of each energy became similar immediately after passing through the water surface. This indicated that each energy distribution had reached the equilibrium state.</p>

    DOI: 10.1299/jsmemecj.2020.s05110

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  233. Effect of uniaxial through hole on the falling behavior of a hollow sphere in water

    The Proceedings of Conference of Tokai Branch   Vol. 2020.69 ( 0 ) page: 602   2020

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    DOI: 10.1299/jsmetokai.2020.69.602

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  234. Flow around Two Circular Cylinders Placed Tandemly Inside a Microbubble Plume

    UCHIYAMA Tomomi, KANO Ryota, DEGAWA Tomohiro, TAKAMURE Kotaro

    The Proceedings of the Fluids engineering conference   Vol. 2019 ( 0 ) page: OS3-07 - 7   2019

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    <p>This study investigates the flow past two cylinders arranged in tandem within a microbubble plume inside a tank. Microbubbles with a mean diameter of 0.055 mm are released by water electrolysis from electrodes placed at the bottom of the tank. Upon rising, these microbubbles induce an upward water flow around them due to buoyancy. Orthogonally to the axis of this microbubble plume, two cylinders with a diameter <i>D</i> of 30 mm are arranged in tandem. The distance between the cylinders, <i>L</i>, ranges between 1.5<i>D</i> and 3<i>D</i>. The bubbles and the water flow around the cylinders are visualized, and the bubble velocity distribution is measured. The experiments reveal the water and bubble shear layers originating at the sides of the lower cylinder, and allow the elucidation of their behavior around the upper cylinder. Furthermore, this study makes clear the effects of <i>L</i> on the flow around the two cylinders, such as the stagnant bubbly flow and the bubbly wake.</p>

    DOI: 10.1299/jsmefed.2019.os3-07

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  235. Numerical Simulations of the Flow and Performance of a Hydraulic Savonius Turbine by the Vortex in Cell Method with Volume Penalization

    TAKAMURE Kotaro, UCHIYAMA Tomomi, GU Qiang, DEGAWA Tomohiro, Iio Shouichiro, IKEDA Toshihiko

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2019 ( 0 ) page: S05121   2019

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    <p>This study is concerned with the numerical simulations of the flow and performance of a rotor of a hydraulic Savonius turbine. The flow was simulated using the vortex in cell (VIC) method in combination with the volume penalization (VP) method. The torque acting on the rotor was computed using a custom method, which can accurately calculate the fluid forces on solid bodies in flows simulated by the VIC-VP method, to analyze the rotational speed and power output of the rotor. The simulated flow around the rotating blades agreed qualitatively with the experimentally visualized flow, and the analyzed relation between the rotor's rotational speed and power output agreed well with the experimentally measured relation. These demonstrate that the VIC-VP method in combined with the authors' method for calculating fluid forces is applicable for the simulations of flow and performance of hydraulic Savonius turbines.</p>

    DOI: 10.1299/jsmemecj.2019.s05121

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  236. Numerical Simulation of Pin-on-disk Sliding Lubricated with Nanometer-thick Liquid Film by MPS Method

    WATABE Shotaro, Uchiyama Tomomi, TAKAMURE Kotaro, ZHANG Hedong, DEGAWA Tomohiro

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2019 ( 0 ) page: S16105P   2019

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    <p>Pin-on-disk sliding tests have been carried out to investigate lubrication properties of nanometer-thick liquid films. However, it is difficult to experimentally observe the detailed flow behavior of the films at the nanoscale contacting interface. To solve this problem, we performed numerical simulations with the moving particle semi-implicit (MPS) method in this study. To model a pin sitting on a rotating disk lubricated with a nanometer-thick liquid film, the effects of surface tension and external force were taken into account in the governing equation. As a result, details of the behavior of the film and pin and their interference were visualized. This result suggests that the MPS method is potentially useful for clarifying the mechanism of lubrication with nanometer-thick liquid films.</p>

    DOI: 10.1299/jsmemecj.2019.s16105p

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  237. Flow past two cylinders arranged in tandem within a microbubble plume

    Uchiyama T., Kano R., Degawa T., Takamure K.

    ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019   Vol. 5   2019

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019  

    This study investigates the flow past two cylinders arranged in tandem within a microbubble plume inside a tank. Microbubbles with a mean diameter of 0.055 mm are released by water electrolysis from electrodes placed at the bottom of the tank. Upon rising, these microbubbles induce an upward water flow around them due to buoyancy. Orthogonally to the axis of this microbubble plume, two cylinders with a diameter D of 30 mm are arranged in tandem. The distance between the cylinders, L, ranges between 1.5D and 3D. The bubbles and the water flow around the cylinders are visualized, and the bubble velocity distribution is measured. The experiments reveal the water and bubble shear layers originating at the sides of the lower cylinder, and allow the elucidation of their behavior around the upper cylinder. Furthermore, this study makes clear the effects of L on the flow around the two cylinders, such as the stagnant bubbly flow and the bubbly wake.

    DOI: 10.1115/AJKFluids2019-4971

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  238. Experimental study of mixing of two-layer density-stratified fluid by a vortex ring

    Cao L., Ito R., Degawa T., Matsuda Y., Takamure K., Uchiyama T.

    ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019   Vol. 5   2019

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference, AJKFluids 2019  

    This study experimentally investigates the mixing of a two-layer density-stratified fluid of water (upper layer) and aqueous sodium chloride (NaCl) solution (lower layer) induced by the interaction between a vortex ring and the density interface. The vortex ring, which consists of water, is launched from an orifice in the upper layer toward the density interface, after which its motion, along with the behavior of the lower fluid, is visualized through a planar laser-induced fluorescence method. The Atwood number that expresses the nondimensional density jump across the density interface is set at 0.0055, and the Reynolds number Re of the vortex ring is varied from 2050 to 3070. The visualization experiment clarifies that the vortex ring penetrating the density interface is bounced while collapsing in the lower fluid. Furthermore, it elucidates that the bounced upper fluid entrains the lower fluid into the upper layer by inducing a second vortex ring consisting of the lower fluid. Thus, this study reveals the effect of Re on the mixing of the upper and lower fluid induced by the launched vortex ring.

    DOI: 10.1115/AJKFluids2019-4972

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  239. Flow around Bluff Body within Bubble Plume

    UCHIYAMA Tomomi

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2019 ( 0 ) page: W05102   2019

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    <p>This article describes the flow around bluff body in microbubble plume. Firstly, the flow around two circular cylinders arranged in tandem within a microbubble plume was investigated. The experiment revealed the water and bubble shear layers originating at the sides of the lower cylinder, and allowed the elucidation of their behavior around the upper cylinder. Secondly, the motion of a solid spherical particle in a microbubble plume and the behavior of bubbles around the particle were studied. The studies clarified the bubble distribution and velocity around the particle.</p>

    DOI: 10.1299/jsmemecj.2019.w05102

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  240. Flow and Noise Characteristics of Cavitating Jet Issuing from a Rectangular Orifice for Various Aspect Ratios

    TAKEI Hironori, WATANABE Akari, IIO Shouichiro, YOSHIDA Futoshi, UCHIYAMA Tomomi

    The Proceedings of the Fluids engineering conference   Vol. 2019 ( 0 ) page: OS3-23 - 23   2019

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    <p>Cavitation is one of the significant issues for water hydraulic components. This study focuses on the relationships between the cavitation phenomenon and noise under various pressure condition. Cavitating jet from a rectangular orifice with different aspect ratio was investigated in this study to reveal the critical parameter for the cavitation in a water hydraulic spool valve. The author performed flow visualization and noise measurement. The experimental results showed that the relationship between jet behavior and noise characteristics. The noises of all aspect ratio jets had a peak at the same positive downstream pressure. The both of cavitation and noise were suppressed for the largest aspect ratio of <i>AR</i>=52.0.</p>

    DOI: 10.1299/jsmefed.2019.os3-23

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  241. Motion of a Solid Sphere Launched Vertically Upward toward Water Surface and the Behavior of Air-Water Interface Induced by the Sphere

    TAKAMURE Kotaro, UCHIYAMA Tomomi

    The Proceedings of the Fluids engineering conference   Vol. 2019 ( 0 ) page: OS3-08 - 8   2019

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    <p>To investigate the variation in a sphere's motion and the behavior of the air-water interface induced by the sphere, a solid sphere is launched vertically upward in water toward the air-water interface. Four spheres with different densities <i>ρ<sub>p</sub></i> were studied: a stainless steel sphere (<i>ρ<sub>p</sub></i> = 7930 kg/m<sup>3</sup>), an alumina sphere (<i>ρ<sub>p</sub></i> = 3900 kg/m<sup>3</sup>), a Teflon sphere (<i>ρ<sub>p</sub></i> = 2180 kg/m<sup>3</sup>), and a Duracon sphere (<i>ρ<sub>p</sub></i> = 1360 kg/m<sup>3</sup>). By experimentally visualizing the sphere motion in water, their launch velocity can be set with high accuracy. When a sphere passes through the air--water interface, it makes the interface more complex and entrains water. Additionally, spheres with a small value of <i>ρ<sub>p</sub></i> were demonstrated to not always vertically collide with the air--water interface.</p>

    DOI: 10.1299/jsmefed.2019.os3-08

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  242. Flow around Bluff Body within Bubble Plume

    UCHIYAMA Tomomi

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2019 ( 0 ) page: W15102   2019

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    <p>This article describes the flow around bluff body in microbubble plume. Firstly, the flow around two circular cylinders arranged in tandem within a microbubble plume was investigated. The experiment revealed the water and bubble shear layers originating at the sides of the lower cylinder, and allowed the elucidation of their behavior around the upper cylinder. Secondly, the motion of a solid spherical particle in a microbubble plume and the behavior of bubbles around the particle were studied. The studies clarified the bubble distribution and velocity around the particle.</p>

    DOI: 10.1299/jsmemecj.2019.w15102

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  243. Development of a propeller-type hollow micro-hydraulic turbine with excellent performance in passing foreign matter

    Uchiyama Tomomi, Honda Satoshi, Degawa Tomohiro

    RENEWABLE ENERGY   Vol. 126   page: 545-551 - 551   2018.10

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    This study develops a micro-hydraulic turbine with excellent performance in the passage of foreign matter included in the water flow. The runner has four blades, with a circular hollow around the rotating axis to pass foreign matter through the runner. The ratio of the hollow diameter D2 to the runner outer diameter D1, D2/D1, is defined as the hollow ratio ε. Laboratory experiments are conducted by introducing polyester fibers into the water flow as foreign matter. The turbine efficiency η decreases with increasing ε under the fiber-free condition. For the runner having no hollow (ε = 0), η decreases drastically with increasing the mass of the introduced fibers. This is due to the blockage of the runner by the fibers. But η for the runners provided with the hollow decreases less. This demonstrates that the hollow makes the fibers pass successfully through the runner. Additional experiments are conducted using the runner with ε = 0.25. The blade leading edges near the central axis are rounded with radius R. When R/D1 = 0.1875, the decrease in η due to the fibers is extremely small. The rounded leading edges successfully prevent the runner from catching the fibers, demonstrating that they effectively heighten the passage performance of foreign matter through the runner.

    DOI: 10.1016/j.renene.2018.03.083

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  244. Improvements to the convection scheme in the vortex particle method using a semi-Lagrangian method

    Degawa Tomohiro, Uchiyama Tomomi

    JOURNAL OF ALGORITHMS & COMPUTATIONAL TECHNOLOGY   Vol. 12 ( 3 ) page: 223 - 233   2018.9

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    DOI: 10.1177/1748301818771811

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  245. Mixing of density-stratified fluid in a cylindrical tank by a diagonal jet Reviewed

    Tomohiro Degawa, Kota Uno, Tomomi Uchiyama

    Journal of Energy and Power Engineering   Vol. 12   page: 436-443   2018

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  246. Falling of a Spherical Particle in Microbubble Plume and Microbubble Behavior around the Particle

    UCHIYAMA Tomomi, KAWASAKI Yujiro, DEGAWA Tomohiro

    The Proceedings of the Fluids engineering conference   Vol. 2018 ( 0 ) page: OS5-20 - 20   2018

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    <p>This study conducts experimental exploration on the motion of a solid spherical particle falling in a microbubble plume and the bubble behavior around the particle. Bubbles with a mean diameter of 0.037 mm, released into a rectangular conduit using the electrolysis of water, rise by the buoyant force and induce a bubble plume. A spherical particle with a diameter 11.1 mm and density 1130 kg/m<sup>3</sup> is released from the top of the conduit. The experiment clarifies that the particle falls meandering through the plume and that the terminal velocity is almost the same as that for a particle falling in quiescent water. The experiment also makes clear that the bubbles separate from the particle surface and that the separation induces a stagnation area just behind the particle. A wake still exists at a location with a distance of three times of the particle diameter from the particle.</p>

    DOI: 10.1299/jsmefed.2018.os5-20

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  247. Motion of a Spherical Particle in Microbubble Plume and Bubble Behavior around the Particle

    UCHIYAMA Tomomi, DEGAWA Tomohiro, KAWASAKI Yujiro

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2018 ( 0 ) page: S0510401   2018

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    <p>This study investigates the motion of a spherical particle in microbubble plume and the bubble behavior around the particle. Microbubbles with a mean diameter of 0.037 mm, released into a rectangular conduit using the electrolysis of water, rise by the buoyant force and induce a bubble plume in the conduit. A spherical particle with a diameter 10 mm and a density 1022 kg/m<sup>3</sup> is placed on a mesh stretched near the bottom of the conduit at the commencement of the microbubble release from the cathode. The experiments clarify the effects of the bubble volumetric flux on the motion of the particle. They also explore the bubble distribution and velocity around the rising, still and lowering particle to make clear the front stagnation and wake of the particle.</p>

    DOI: 10.1299/jsmemecj.2018.s0510401

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  248. Numerical Simulation of Flow around an Oscillating Cylinder by Vortex in Cell Method

    DEGAWA Tomohiro, GU Qiang, UCHIYAMA Tomomi

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2018 ( 0 ) page: S0510105   2018

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    <p>In the present study, we propose a method for calculating the fluid dynamic forces acting on bodies in a two-dimensional simulation of a flow around a moving body by using the vortex–in–cell method. The body is represented using the volume penalization method which introduces the influence of the body on the flow as an external force in the form of a penalization term into the Navier–Stokes equation. The pressure field is computed by solving the Poisson equation, which is derived by obtaining the divergence of the Navier-Stokes equation. The pressure and viscous stress on the body surface are obtained from a quadratic function along the vector normal to the surface. A flow around a circular cylinder oscillating in still water is simulated, and the fluid dynamic force acting on the cylinder is calculated using the proposed method. The velocity profiles across four cross-sections at three different time points agree well with the results of a measurement conducted using a laser Doppler velocimeter. The in-line force acting on the cylinder agrees with the results of the simulations performed using the boundary-conforming formulation.</p>

    DOI: 10.1299/jsmemecj.2018.s0510105

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  249. Mixing of density-stratified fluid in a cylindrical tank by a diagonal jet Reviewed

    Tomohiro Degawa, Kota Uno, Tomomi Uchiyama

    Journal of Energy and Power Engineering   Vol. 12   page: 436-443   2018

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  250. Numerical simulation of jet issuing diagonally upward into density-stratified fluid in cylindrical tank Reviewed

    Degawa, T, Uchiyama, T, Aozasa, I, Ishikawa, A, Motoyama, K

    J. Power and Energy Eng.   Vol. 6 ( 3 ) page: 38-52   2018

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  251. Control of air bubble cluster by a vortex ring launched into still water Reviewed

    Uchiyama, T, Kusamichi, S

    Int. J. Chemical Engineering and Applications   Vol. 8 ( 1 ) page: 37-46   2017

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  252. Numerical Simulation of Mixing Process by Vortex Rings Launched into Two-Layer Density-Stratified Fluid

    DEGAWA Tomohiro, Uchiyama Tomomi

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2017 ( 0 ) page: S0520405   2017

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    <p>This study numerically investigates the mixing of a two-layer density stratified fluid caused by vortex rings. Initially, the density-stratified fluid is in a static condition in a tank. The upper and lower fluids are glycerol aqueous solution and an aqueous solution of potassium dihydrogen phosphate, respectively. Two vortex rings are arranged on a vertical line in the lower fluid, and the axial interval is 80 mm. The diameter of the vortex ring is 26.4 mm, and the Reynolds numbers based on the circulation are 4000, 6000, and 8000. The vortex rings are launched simultaneously in the vertically upward direction. The simulation explores the collision of the vortex rings with the density interface, the entrainment of the fluids into the vortex rings, and the resulting mixing between the fluids. It also clarifies the behavior of each vortex ring, such as the deformation and the interaction with the density interface.</p>

    DOI: 10.1299/jsmemecj.2017.s0520405

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  253. Numerical Simulation of a Vortex Ring Impacting with a Density Interface of Density-stratified Fluids

    ITO Takenori, DEGAWA Tomohiro, Uchiyama Tomomi, TSUNODA Hiroyuki

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2017 ( 0 ) page: S0520406   2017

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    <p>This study simulates the behavior of a vortex ring launched toward the interface of a two-layer density stratified fluid and the resulting mixing phenomena between the fluids. Initially, the density-stratified fluid is in a static condition in a tank. The upper and lower fluids are glycerol aqueous solution and an aqueous solution of potassium dihydrogen phosphate, respectively. The vortex ring with a diameter of 26.4 mm is launched vertically downward from the upper fluid region. It travels by the vertical motion toward the density interface. The Reynolds number, based on the circulation of the vortex ring, is 3500. The simulation conditions are parallel with an experimental work of one of the authors. The vortex in cell method, which was presented by the authors for flow simulations of two-layer density stratified fluid in a prior study, is used. The simulation favorably highlights the collision, deformation and penetration of the vortex ring at the density interface. It also successfully reveals the mixing between the upper and lower fluids induced by the motion of the vortex ring. These simulated results are discussed by comparing with the corresponding experimental ones.</p>

    DOI: 10.1299/jsmemecj.2017.s0520406

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  254. Behavior of a jet issuing diagonally upward into two-layer density-stratified fluid in a cylindrical tank Reviewed

    Degawa, T, Fukue, S, Uchiyama, T, Ishikawa, A, Motoyama, K

    J. Flow Control, Measurement & Visualization   Vol. 5   page: 51-64   2017

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  255. Generation and transport of solid particle clusters using a vortex ring launched into water Reviewed

    Uchiyama, T, Yano, C, Degawa, T

    Int. J. Chemical Engineering and Applications   Vol. 8 ( 4 ) page: 253-260   2017

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  256. Development of Generation and Transport Technologies of Solid Particle Clusters Using a Vortex Ring

    UCHIYAMA Tomomi

    Hosokawa Powder Technology Foundation ANNUAL REPORT   Vol. 25 ( 0 ) page: 26 - 32   2017

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    <p>The generation and transport of solid particle clusters by a vortex ring launched into quiescent water are explored. A vortex ring launcher, composed of a cylinder and a piston, is mounted at the bottom of a water tank. Polyacetal particles are placed on a mesh stretched near the cylinder outlet. The number of particles is 100, the mean diameter and density are 1.52 mm and 1417 kg/m<sup>3</sup> respectively. The water in the cylinder is discharged vertically upward into the tank by the piston to launch the particle-laden vortex ring. Such two-phase flows of the Reynolds number Re based on the piston velocity and the cylinder diameter at 6500, 7500 and 13000 are investigated. The particles are entrained just after the launch of the vortex ring of <i>Re</i> = 7500 and 13000. The resultant particle cluster is transported by the convection of the vortex ring. The water velocity on the vertical cross-section of the vortex ring lessens due to the particles, resulting in the reduction of the circulation of the vortex ring. The reduction is larger for the lower <i>Re</i>.</p>

    DOI: 10.14356/hptf.15102

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  257. A Feasibility Study of Power Generation from Sewage Using a Hollowed Pico-Hydraulic Turbine

    Uchiyama Tomomi, Honda Satoshi, Okayama Tomoko, Degawa Tomohiro

    ENGINEERING   Vol. 2 ( 4 ) page: 510 - 517   2016.12

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    This study is concerned with the feasibility of power generation using a pico-hydraulic turbine from sewage flowing in pipes. First, the sewage flow rate at two connection points to the Toyogawa River-Basin Sewerage, Japan, was explored for over a year to elucidate the hydraulic energy potential of the sewage. Second, the performance of the pico-hydraulic turbine was investigated via laboratory experiments that supposed the turbine to be installed in the sewage pipe at the connection points. This study indicates that the connection points have hydraulic potential that can be used for power generation throughout the year. It also demonstrates that the pico-hydraulic turbine can be usefully employed for power generation from sewage flowing in the pipe at the connection points.

    DOI: 10.1016/J.ENG.2016.04.007

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  258. Numerical simulation of the interactions between a vortex ring and solid particles suspended above a horizontal wall

    Uchiyama Tomomi, Shimada Seiji

    POWDER TECHNOLOGY   Vol. 301   page: 966 - 980   2016.11

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    The interactions between a vortex ring and solid particles near a horizontal wall in the air are explored in this study using numerical simulations. The vortex ring is moved toward the particles initially arranged in layers above the wall. The Reynolds number of the vortex ring is 1146. When the Stokes number St is 0.1, the particles initially arranged around the central axis of the vortex ring are driven toward the wall while moving in the radial direction. They distribute circularly along the outer edge of the particle cluster on the wall. The particles near the layer's edge are whirled up. Three-dimensional vortex structures, including secondary and tertiary vortex rings, are produced around the particles. When St = 1, vortical flows induced around the particles appear in the broader region. They reduce rapidly owing to the motion of particles relative to the wall (collision and rebound). The drag force acting on the particles lowers the strength of the vortex ring and also suppresses the approach of the vortex ring toward the wall.

    DOI: 10.1016/j.powtec.2016.07.042

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  259. Numerical simulation of flow around two tandem cylinders by vortex in cell method combined with immersed boundary method

    Van Luc N., Zuhal L.R., Uchiyama T.

    Advances and Applications in Fluid Mechanics   Vol. 19 ( 4 ) page: 787 - 810   2016.10

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Advances and Applications in Fluid Mechanics  

    This study is concerned with the numerical simulation of incompressible flows around two circular cylinders in tandem arrangement. A vortex in cell (VIC) method combined with an immersed boundary (IB) method is applied to the simulation. The Reynolds number Re, based on the diameter D of cylinder and the flow velocity upstream of the front cylinder, ranges from 200 to 9500. The distance L between the cylinders is varied from 1.5D to 8D. The simulated flow characteristics, such as the behavior of the shear layers separated from the cylinders, the vortex shedding and the fluid forces acting on the cylinders, are favorably compared with the existing results. The simulation can also successfully analyze the effects of Re and L on the flow characteristics. These simulation results demonstrate that the VIC method combined with the IB method is usefully applicable to the simulation of incompressible flows around two tandem cylinders.

    DOI: 10.17654/FM019040787

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  260. Study of the interactions between rising air bubbles and vortex core of swirling water flow around vertical axis

    Uchiyama Tomomi, Ishiguro Yukihiro

    CHEMICAL ENGINEERING SCIENCE   Vol. 142   page: 137 - 143   2016.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Chemical Engineering Science  

    The interactions between rising air bubbles and the vortex core of swirling water flows in a cylindrical tank are experimentally investigated. A stirring disc mounted at the center of the tank bottom is rotated to produce swirling water flows around the central (vertical) axis of the tank, and small air bubbles are successively released from tubules mounted near the stirring disc. The bubbles rise helically in the swirling water flow because of the buoyancy force, and some bubbles are entrained into the vortex core. The precessional amplitude of the vortex core is enhanced by the bubbles when the bubble flow rate Qg is very low. But it decreases with increasing Qg when Qg is larger than a certain value. In the horizontal cross-sections near the stirring disc, the bubbles make the water flow field nonaxisymmetric and reduce the water velocity. The water velocity variation due to the bubbles affects the shape of the vortex funnel formed at the water surface.

    DOI: 10.1016/j.ces.2015.11.042

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  261. Numerical Simulation of Mixing of Density-Stratified Fluid in a Cylindrical Tank by a Diagonal Jet

    UCHIYAMA Tomomi, AOZASA Isao, ISHIKAWA Akira, MOTOYAMA Kouji

    The Proceedings of the Fluids engineering conference   Vol. 2016 ( 0 ) page: 0207   2016

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    <p>Mixing phenomena, induced by a jet issued diagonally upward into a two-layer densitystratified fluid in a cylindrical tank, are numerically simulated. The upper and lower fluids are water and a NaCl aqueous solution, respectively. The mass concentration of the NaCl-water solution is 0.02. The lower fluid is issued from a nozzle mounted on the tank bottom. The angle of the nozzle to the tank bottom is 60 degree, and the Reynolds number defined by the jet velocity and the nozzle diameter ranges from 475 to 3089. The simulation highlights the jet behavior relative to the density interface and the resultant mixing phenomena.</p>

    DOI: 10.1299/jsmefed.2016.0207

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  262. Study of the interactions between rising air bubbles and vortex core of swirling water flow around vertical axis Reviewed

    Uchiyama, T, Ishiguro, Y

    Chemical Engineering Science   Vol. 142   page: 137-143   2016

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  263. SIMULATION OF JET ISSUED INTO TWO-LAYER DENSITY-STRATIFIED FLUID BY VORTEX IN CELL METHOD COMBINED WITH IMMERSED BOUNDARY METHOD

    Aozasa Isao, Uchiyama Tomomi

    PROCEEDINGS OF THE ASME/JSME/KSME JOINT FLUIDS ENGINEERING CONFERENCE, 2015, VOL 1A, SYMPOSIA, PT 2     2016

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  264. Numerical simulation of the interactions between a vortex ring and solid particles suspended above a horizontal wall Reviewed

    Uchiyama, T, Shimada, S

    Powder Technology   Vol. 301   page: 966-980   2016

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  265. Experimental study of flow around a circular cylinder inside a bubble plume Reviewed

    Uchiyama, T, Ishiguro, Y

    Advances in Chem. Eng. Sci.   Vol. 6   page: 269-280   2016

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  266. Effects of clearance between rotor and ground on the performance of an open cross-flow-type nano-hydraulic turbine Reviewed

    Uchiyama, T, Mizoguchi, S, Iio, S, Katayama, Y, Ikeda, T

    J. Energy and Power Engineering   Vol. 10   page: 465-473   2016

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  267. Accuracy analysis of the Lattice Boltzmann equation method for the Cahn-Hilliard equation

    SETA Takeshi, UCHIYAMA Tomomi, TAKANO Noboru

    The Proceedings of The Computational Mechanics Conference   Vol. 2016.29 ( 0 ) page: 050   2016

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    DOI: 10.1299/jsmecmd.2016.29.050

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  268. A feasibility study of power generation from sewage using a hollowed pico-hydraulic turbine Reviewed

    Uchiyama, T, Honda, T, Okayama, T, Degawa, T

    Engineering   Vol. 2   page: 510-517   2016

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  269. Study of the Interactions between Rising Air Bubbles and Vortex Core of Swirling Water Flow around Vertical Axis

    UCHIYAMA Tomomi, ISHIGURO Yukihiro

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2016 ( 0 ) page: S0520304   2016

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    <p>The interactions between rising air bubbles and the vortex core of swirling water flows in a cylindrical tank are experimentally investigated. A stirring disc mounted at the center of the tank bottom is rotated to produce swirling water flows around the central (vertical) axis of the tank, and small air bubbles are successively released from tubules mounted near the stirring disc. The bubbles rise helically in the swirling water flow because of the buoyancy force, and some bubbles are entrained into the vortex core. The precessional amplitude of the vortex core is enhanced by the bubbles when the bubble flow rate <i>Q</i><sub>g</sub> is very low. But it decreases with increasing <i>Q</i><sub>g</sub> when <i>Q</i><sub>g</sub> is larger than a certain value. In the horizontal cross-sections near the stirring disc, the bubbles make the water flow field non- axisymmetric and reduce the water velocity.</p>

    DOI: 10.1299/jsmemecj.2016.s0520304

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  270. Numerical Study of Wall Wettabilities by Immersed Boundary-Lattice Boltzmann Method

    SETA Takeshi, Uchiyama Tomomi, TAKANO Noboru

    The Proceedings of the Fluids engineering conference   Vol. 2016 ( 0 ) page: 0711   2016

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    <p>We improve the accuracy and the numerical stability of the immersed boundary-lattice Boltzmann method (IB-LBM) to calculate the motion of a droplet on hydrophobic surfaces in complex geometry. To exactly derive the Chan-Hilliard equation, we use the proper source term proposed by Liang and the two-relaxation-time (TRT) collision operator. The series of the numerical tests, including Zalesak’s disk rotation, a single vortex, and a deformation of a sphere demonstrate that the computational effectiveness of the TRT collision operator is superior to that of the multi relaxation time collision operator. Analytical and numerical solutions of the symmetric shear flows demonstrate that the implicit diffuse direct-forcing method without the computational cost of the sparse matrix solver reduces the velocity slip and boundary value deviation as effectively as the implicit correction method for any relaxation times. The present IB-LBM with the TRT collision operator appropriately calculates the contact angle of liquids on the arbitrary shaped surfaces.</p>

    DOI: 10.1299/jsmefed.2016.0711

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  271. Numerical study on the flow and performance of an open cross-flow mini-hydraulic turbine

    Uchiyama Tomomi, Uehara Shou, Fukuhara Haruki, Iio Shouichiro, Ikeda Toshihiko

    PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART A-JOURNAL OF POWER AND ENERGY   Vol. 229 ( 8 ) page: 968 - 977   2015.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy  

    This study simulates the flow through a small-scale open cross-flow hydraulic turbine and analyzes the turbine's performance. The simulation employs a two-dimensional particle method that was used for the simulation of a small-scale impulse-type hydraulic turbine in a prior study. Flow in the turbine is successfully simulated, with the simulated turbine performance showing good agreement with experimental measurements. The simulations also clarify that the deterioration in performance with increasing water flow rate is caused by the degeneration of the radially outward flow between the rotor blades.

    DOI: 10.1177/0957650915592260

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  272. Investigation of Blade Angle of an Open Cross-Flow Runner

    Katayama Yusuke, Iio Shouichiro, Veerapun Salisa, Uchiyama Tomomi

    INTERNATIONAL JOURNAL OF TURBO & JET-ENGINES   Vol. 32 ( 1 ) page: 65 - 72   2015.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:International Journal of Turbo and Jet Engines  

    The aim of this study was to develop a nano-hydraulic turbine utilizing drop structure in irrigation channels or industrial waterways. This study was focused on an open-type cross-flow turbine without any attached equipment for cost reduction and easy maintenance. In this study, the authors used an artificial indoor waterfall as lab model. Test runner which is a simple structure of 20 circular arc-shaped blades sandwiched by two circular plates was used The optimum inlet blade angle and the relationship between the power performance and the flow rate approaching theoretically and experimentally were investigated. As a result, the optimum inlet blade angle due to the flow rate was changed. Additionally, allocation rate of power output in 1st stage and 2nd stage is changed by the blade inlet angle.

    DOI: 10.1515/tjj-2015-0005

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  273. S0510402 Experimental Study on the Flow around a Circular Cylinder Mounted in Bubble Plume

    UCHIYAMA Tomomi, ISHIGURO Yukihiro

    The Proceedings of Mechanical Engineering Congress, Japan   Vol. 2015 ( 0 ) page: _S0510402- - _S0510402-   2015

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    This study explores the bubble plume around a circular cylinder in a water tank. Small gas bubbles with diameter of less than 0.06 mm are released from electrodes on the bottom of the tank by using the electrolysis of water. They induce the water flow with rising by the buoyant force. In such bubble plume, a circular cylinder with diameter D of 30 mm is mounted at an elevation of 6.5D above the electrodes. This study visualizes the bubbles and water flow around the cylinder and measures the bubble velocity distribution. The experiment elucidates the separated shear layers originating from the cylinder wall, their roll-up, and the bubble entrainment in the resultant large-scale eddies behind the cylinder.

    DOI: 10.1299/jsmemecj.2015._s0510402-

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  274. Numerical study on the flow and performance of an open cross-flow mini-hydraulic turbine Reviewed

    Uchiyama, T, Uehara, S, Fukuhara, H, Iio, S, Ikeda, T

    J. Power and Energy, Proc. IMechE Part A   Vol. 229 ( 8 ) page: 968-977   2015

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  275. Numerical simulation of jet flow issued into density-stratified fluid by vortex in cell method

    Shakouchi S., Shimada S., Uchiyama T.

    Advances and Applications in Fluid Mechanics   Vol. 17 ( 1 ) page: 115 - 134   2015

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    This study proposes a numerical simulation method for a jet flow issued into a two-layer density-stratified fluid. The method is based on the Vortex in Cell method, which discretizes the vorticity field into vortex elements and computes the time evolution of the flow by tracing the convection of each vortex element using the Lagrangian approach. The proposed method is applied to simulate a jet flow, which was experimentally investigated in the authors’ prior study, so as to demonstrate the validity of the method. The simulation highlights that the jet behavior relative to the density interface depends on the jet Reynolds number and that it agrees well with the experimentally visualized one.

    DOI: 10.17654/15-aafm-01701-115

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  276. Numerical simulation of bubbly flow by vortex in cell method

    Uchiyama Tomomi, Yoshii Yutaro

    IUTAM SYMPOSIUM ON PARTICLE METHODS IN FLUID DYNAMICS   Vol. 18   page: 138 - 147   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Procedia IUTAM  

    A vortex in cell (VIC) method for bubbly flow is proposed. It computes the time evolution of the flow by calculating the behavior of the vortex element as well as the bubble motion with the Lagrangian approach. The proposed method is also applied to simulate a bubble plume to demonstrate the validity. In a tank containing water, small air bubbles are released from the base of the tank. The bubbles rise due to the buoyant force, inducing the water flow around them. The simulation for the plume at the starting period highlights that the rising bubbles induce vortex rings at their top and that a bubble cluster appears owing to the entrainment of the bubbles into the vortex rings. The rising velocity for the top of the bubbles is proportional to the square root for the flow rate of the released bubbles, being consistent with an existing theoretical investigation. The simulation also demonstrates that the developed bubble plume having jet characteristics is successfully captured.

    DOI: 10.1016/j.piutam.2015.11.014

    Web of Science

    Scopus

  277. Numerical simulation of bubbly flow by an improved vortex in cell method

    Uchiyama T., Yoshii Y., Chen B., Wang Z.

    Advances and Applications in Fluid Mechanics   Vol. 17 ( 1 ) page: 91 - 114   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Advances and Applications in Fluid Mechanics  

    A simulation method for gas-liquid bubbly flows entraining small bubbles is proposed. It is based on the Vortex in Cell (VIC) method originally presented to simulate incompressible single-phase flows. The staggered grid discretization method and the vorticity correction method, which were proposed for the VIC method simulating single-phase flows by the authors’ prior study, are employed. The liquid velocity field is discretized with vortex elements, and the time evolution of the bubbly flow is simulated by calculating the behavior of each vortex element and the bubble motion through the Lagrangian approach. The proposed method is applied to the simulation of a bubble plume in a water tank to discuss the validity and applicability. Small air bubbles are released successively from the base of the tank, and their rise due to the buoyant force induces the water flow around them. The simulation at the starting period of the bubble release highlights that the rising bubbles induce vortex rings at their top and that a bubble cluster appears owing to the entrainment of the bubbles into the vortex rings. The rising velocity of the top of the bubbles is proportional to the square-root of the flowrate of the released bubbles, being consistent with the existing theoretical and numerical investigations. The simulation also demonstrates that the developed bubble plume having jet characteristics is successfully captured.

    DOI: 10.17654/15-aafm-01701-091

    Scopus

  278. Development of a non-clogging micro-hydraulic turbine of propeller type

    Uchiyama T., Nishida Y., Ide Y.

    ICOPE 2015 - International Conference on Power Engineering     2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ICOPE 2015 - International Conference on Power Engineering  

    This study is concerned with the development of a hollow micro-hydraulic turbine excellent in foreign matter passage performance. The runner has a circular hollow around the central (rotating) axis so that foreign matter included in water can easily flow without blocking the turbine. The laboratory experiments are conducted to investigate the turbine performance. The guide vane successfully heightens the turbine efficiency. Though the maximum efficiency decreases with increasing the hollow ratio ϵ when ϵ>0.25, it remains unchanged when ϵ≤ 0.25. The hollow of the runner effectively heightens the passage performance of the polyester fibers entrained into the turbine. When employing the guide vane, the developed micro-hydraulic turbine of ϵ≥0.375 is not blocked by the fibers and maintains its function.

    Scopus

  279. 402 Development of a Non-Clogging Micro-Hydraulic Turbine of Propeller Type

    UCHIYAMA Tomomi, IDE Yukio, OKAYAMA Tomoko

    The Proceedings of the Symposium on Environmental Engineering   Vol. 2015.25 ( 0 ) page: 143 - 146   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    This study is concerned with the development of a hollow micro-hydraulic turbine excellent in foreign matter passage performance. The runner has a circular hollow around the central (rotating) axis so that foreign matter included in water can easily flow without blocking the turbine. The laboratory experiments are conducted to investigate the turbine performance. Though the turbine efficiency decreases with increasing the hollow ratio e when ε>0.25, it remains unchanged when ε&le;0.25. The hollow of the runner effectively heightens the passage performance of the polyester fibers entrained into the turbine. The developed micro-hydraulic turbine of ε&ge;0.375 is not blocked by the fibers and maintains its function.

    DOI: 10.1299/jsmeenv.2015.25.143

    CiNii Research

  280. 0210 Numerical Simulation of Jet Issued into Density-Stratified Fluid in a Cylindrical Tank

    AOZASA Isao, UCHIYAMA Tomomi

    The Proceedings of the Fluids engineering conference   Vol. 2015 ( 0 ) page: _0210-1_ - _0210-5_   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    This study is concerned with the numerical simulation of the jet issued into two-layer density-stratified fluid in a cylindrical tank. Vortex in cell (VIC) method combined with an Immersed Boundary (IB) method is applied to the simulation. The upper and lower fluids are water and a NaCl-water solution, respectively, and the lower fluid is issued vertically upward from a nozzle on the bottom of the tank. The Reynolds number Re defined by the jet velocity and the nozzle diameter ranges from 95 to 1188, and the mass concentration of the NaCl-water solution is set at 0.02. The simulation highlights that the jet behavior relative to the density interface and the resultant mixing phenomena depend on Re. Such simulated results are confirmed to agree well with the experimentally visualized ones, demonstrating the validity of the present simulation method.

    DOI: 10.1299/jsmefed.2015._0210-1_

    CiNii Research

  281. ICOPE-15-1101 Development of a non-clogging micro-hydraulic turbine of propeller type

    UCHIYAMA Tomomi, NISHIDA Yoshihiro, IDE Yukio

    The Proceedings of the International Conference on Power Engineering (ICOPE)   Vol. 2015.12 ( 0 ) page: _ICOPE-15- - _ICOPE-15-   2015

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Mechanical Engineers  

    This study is concerned with the development of a hollow micro-hydraulic turbine excellent in foreign matter passage performance. The runner has a circular hollow around the central (rotating) axis so that foreign matter included in water can easily flow without blocking the turbine. The laboratory experiments are conducted to investigate the turbine performance. The guide vane successfully heightens the turbine efficiency. Though the maximum efficiency decreases with increasing the hollow ratio ε when ε>0.25, it remains unchanged when ε≦0.25. The hollow of the runner effectively heightens the passage performance of the polyester fibers entrained into the turbine. When employing the guide vane, the developed micro-hydraulic turbine of ε≧0.375 is not blocked by the fibers and maintains its function.

    DOI: 10.1299/jsmeicope.2015.12._icope-15-_70

    CiNii Research

  282. Simulation of jet issued into two-layer density-stratified fluid by vortex in cell method combined with immersed boundary method

    Aozasa I., Uchiyama T.

    ASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015   Vol. 1A   2015

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:ASME/JSME/KSME 2015 Joint Fluids Engineering Conference, AJKFluids 2015  

    Jet flow issued into two-layer density-stratified fluid in a cylindrical tank is numerically simulated. Vortex in cell (VIC) method combined with an Immersed Boundary (IB) method, which is presented by the current authors, is applied to the simulation. The upper and lower fluids are water and a NaCl-water solution, respectively, and the lower fluid is issued vertically upward from a nozzle on the bottom of the tank. The Reynolds number Re defined by the jet velocity and the nozzle diameter ranges from 95 to 1188, and the mass concentration of the NaCl-water solution Co is set at 0 and 0.02. The simulation highlights that the jet behavior relative to the density interface and the resultant mixing phenomena depend on Re. Such simulated results are confirmed to agree well with the experimentally visualized ones, demonstrating the validity of the present simulation method.

    DOI: 10.1115/ajkfluids2015-24394

    Scopus

  283. Numerical Simulation of Entrainment and Transport of Gas Bubbles by Vortex in Cell Method Invited Reviewed

    Uchiyama, T. and Yoshii, Y

        page: on USB flash drive   2011.7

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    Authorship:Lead author   Language:English  

  284. Vortex Simulation for Bahavior of Solid Particles Falling in Air Reviewed

    Yagami, H. and Uchiyama, T.

    Proc. ASME-JSME-KSME Joint Fluids Engineering Conference 2011     page: on USB flash drive   2011.7

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    Language:English  

  285. Vortex in Cell法による気泡流の数値シミュレーション Reviewed

    内山知実,吉井佑太郎

    日本機械学会論文集B編   Vol. 77 ( 778 ) page: 1301-1313   2011

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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Books 4

  1. 有限要素法による計算流体力学 -解説編-

    内山知実( Role: Sole author)

    T&Mソリューションズ  2008.1 

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    Language:Japanese

  2. 有限要素法による計算流体力学 -プログラム編-

    内山知実( Role: Sole author)

    T&Mソリューションズ  2008.1 

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    Language:Japanese

  3. Javaによる連続体力学の有限要素法

    内山知実( Role: Sole author)

    森北出版  2001.11 

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    Language:Japanese

    本書は,有限要素法の基本的な考え方を説明するとともに.連続体力学が対象とする様々な解析.すなわち構造解析.流体解析,熱流体連成解析,構造流体連成解析への適用を通して具体的な手法(定式化,離散化,マトリクス計算など)を解説する.

  4. 情報メディア教育システムハンドブック

    ( Role: Joint author)

    昭晃堂  2001.4 

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    Language:Japanese

MISC 12

  1. Development of a propeller-type hollow micro-hydraulic turbine with excellent performance in passing foreign matter Reviewed

    Tomomi Uchiyama, Satoshi Honda, Tomohiro Degawa

    Renewable Energy   Vol. 126   page: 545 - 551   2018.10

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)   Publisher:Elsevier Ltd  

    This study develops a micro-hydraulic turbine with excellent performance in the passage of foreign matter included in the water flow. The runner has four blades, with a circular hollow around the rotating axis to pass foreign matter through the runner. The ratio of the hollow diameter D2 to the runner outer diameter D1, D2/D1, is defined as the hollow ratio ε. Laboratory experiments are conducted by introducing polyester fibers into the water flow as foreign matter. The turbine efficiency η decreases with increasing ε under the fiber-free condition. For the runner having no hollow (ε = 0), η decreases drastically with increasing the mass of the introduced fibers. This is due to the blockage of the runner by the fibers. But η for the runners provided with the hollow decreases less. This demonstrates that the hollow makes the fibers pass successfully through the runner. Additional experiments are conducted using the runner with ε = 0.25. The blade leading edges near the central axis are rounded with radius R. When R/D1 = 0.1875, the decrease in η due to the fibers is extremely small. The rounded leading edges successfully prevent the runner from catching the fibers, demonstrating that they effectively heighten the passage performance of foreign matter through the runner.

    DOI: 10.1016/j.renene.2018.03.083

    Scopus

  2. Numerical simulation of jet issuing diagonally upward into density-stratified fluid in cylindrical tank Reviewed

    Degawa, T, Uchiyama, T, Aozasa, I, Ishikawa, A, Motoyama, K

    J. Power and Energy Eng.   Vol. 6 ( 3 ) page: 38-52   2018

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

  3. Smoothed profile-lattice Boltzmann method for non-penetration and wetting boundary conditions in two and three dimensions Reviewed

    Takeshi Seta, Tomomi Uchiyama, Noboru Takano

    COMPUTERS & FLUIDS   Vol. 159   page: 64 - 80   2017.12

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)   Publisher:PERGAMON-ELSEVIER SCIENCE LTD  

    In this study, the smoothed profile-lattice Boltzmann method (SP-LBM) is proposed to determine the contact line dynamics on a hydrophobic or a hydrophilic curved wall. Two types of smoothed indicator functions are introduced, namely a function that identifies the solid domain for non-slip and non-penetration conditions and a function that denotes the boundary layer for no mass-flux and the wetting boundary conditions. In order to prevent fluid penetration into the solid boundary, the fluid-solid interaction force is computed based on the definition of the fluid velocity as proposed by Guo et al. [1]. In order to implement the Neumann boundary conditions for the order parameter and the chemical potential, the fluxes from the solid surfaces are distributed to relevant physical valuables through a smoothed profile. Several two-dimensional and three-dimensional numerical investigations including those determining the Couette flows, flow around a circular cylinder, transition layer on a wetting boundary, and dynamic behavior of a droplet on a flat or curved plate demonstrate the efficiency of the present method in calculating the contact angle of a droplet on curved surfaces with wall impermeability. The present model provides a simple algorithm to compute the surface normal vector and contact line dynamics on an arbitrarily shaped boundary by using a smoothed-profile. (C) 2017 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.compfluid.2017.09.012

    Web of Science

  4. Behavior of a jet issuing diagonally upward into two-layer density-stratified fluid in a cylindrical tank Reviewed

    Degawa, T, Fukue, S, Uchiyama, T, Ishikawa, A, Motoyama, K

    J. Flow Control, Measurement & Visualization   Vol. 5   page: 51-64   2017

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

  5. Generation and transport of solid particle clusters using a vortex ring launched into water Reviewed

    Uchiyama, T, Yano, C, Degawa, T

    Int. J. Chemical Engineering and Applications   Vol. 8 ( 4 ) page: 253-260   2017

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

  6. Control of air bubble cluster by a vortex ring launched into still water Reviewed

    Uchiyama, T, Kusamichi, S

    Int. J. Chemical Engineering and Applications   Vol. 8 ( 1 ) page: 37-46   2017

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

  7. Study of the interactions between rising air bubbles and vortex core of swirling water flow around vertical axis Reviewed

    Uchiyama, T, Ishiguro, Y

    Chemical Engineering Science   Vol. 142   page: 137-143   2016

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

  8. Numerical simulation of the interactions between a vortex ring and solid particles suspended above a horizontal wall Reviewed

    Uchiyama, T, Shimada, S

    Powder Technology   Vol. 301   page: 966-980   2016

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

  9. Experimental study of flow around a circular cylinder inside a bubble plume Reviewed

    Uchiyama, T, Ishiguro, Y

    Advances in Chem. Eng. Sci.   Vol. 6   page: 269-280   2016

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  10. Effects of clearance between rotor and ground on the performance of an open cross-flow-type nano-hydraulic turbine Reviewed

    Uchiyama, T, Mizoguchi, S, Iio, S, Katayama, Y, Ikeda, T

    J. Energy and Power Engineering   Vol. 10   page: 465-473   2016

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

  11. A feasibility study of power generation from sewage using a hollowed pico-hydraulic turbine Reviewed

    Uchiyama, T, Honda, T, Okayama, T, Degawa, T

    Engineering   Vol. 2   page: 510-517   2016

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    Language:English   Publishing type:Rapid communication, short report, research note, etc. (scientific journal)  

  12. Numerical study on the flow and performance of an open cross-flow mini-hydraulic turbine Reviewed

    Uchiyama, T, Uehara, S, Fukuhara, H, Iio, S, Ikeda, T

    J. Power and Energy, Proc. IMechE Part A   Vol. 229 ( 8 ) page: 968-977   2015

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Presentations 10

  1. 非圧縮性二流体モデルの有限要素解析(上流化法およびALE法の適用)

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    Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  2. 渦法による固気二相自由乱流の数値解析

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    Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  3. 固気二相自由乱流の渦法解析

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    Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  4. 渦法による固気二相自由乱流の数値シミュレーション

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    Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  5. 固気二相自由乱流の渦法シミュレーション

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    Presentation type:Oral presentation (invited, special)  

    Country:Japan  

  6. 渦法による固気二相自由乱流の数値解析

    粉体工学会 計算粉体力学グループ会

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    Language:English   Presentation type:Oral presentation (invited, special)  

  7. 渦法による固気二相自由乱流の数値シミュレーション

    日本伝熱学会東海支部

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    Language:English   Presentation type:Oral presentation (invited, special)  

  8. 固気二相自由乱流の渦法解析

    日本機械学会関西支部 流体工学懇話会

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    Language:English   Presentation type:Oral presentation (invited, special)  

  9. 固気二相自由乱流の渦法シミュレーション

    日本混相流学会

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    Language:English   Presentation type:Oral presentation (invited, special)  

  10. 非圧縮性二流体モデルの有限要素解析(上流化法およびALE法の適用)

    混相流のグラフィック・シミュレーションと可視化 研究会

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KAKENHI (Grants-in-Aid for Scientific Research) 20

  1. マイクロ水力発電の実用化に向けた高効率開放型クロスフロー水車の最適形状研究

    Grant number:22K05000  2022.4 - 2027.3

    科学研究費助成事業  基盤研究(C)

    藤沢 延行, 山縣 貴幸, 飯尾 昭一郎, 内山 知実, 片山 雄介

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    Authorship:Coinvestigator(s) 

    高効率なマイクロ水力発電システムを実用化することを目的として、除塵性、製造コスト、運転時の維持管理コストに優れた、開放型クロスフロー水車の高効率化研究を行う。本研究では、(1) VOF法と粒子法によるベンチマークテスト、 (2) ブレード形状の最適化、(3) 部分的ガイド壁の導入による隙間効果による高効率化、(4) 実験による水車性能と流れ場の検証を行い、総合的に水車の出力増大機構の解明を行う。

  2. 気液二相流の各相流量の同時測定のための電源自立型IoT流量計の開発

    Grant number:21K03852  2021.4 - 2024.3

    科学研究費助成事業  基盤研究(C)

    内山 知実, 高牟禮 光太郎

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    Authorship:Principal investigator 

    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

    気液二相流の気液を分離することなく,各相の流量を同時に測定できる流量計を開発する.その実装性と運用性を高めるため,自己発電機能とインターネットとの無線通信機能を付与する.タービン流量計,水力発電,IoT,機械学習の知見を総動員した研究である.ロータ回転数を測定し,その時間変化の特徴量(尖度,歪度,標準偏差,平均値)をニューラルネットワークに入力して各相流量を測定(同定)する,新奇な電源自立型のIoT流量計である.

  3. 雪氷に強い小型水車の開発を目的とした実証実験

    Grant number:19K12433  2019.4 - 2022.3

    科学研究費助成事業  基盤研究(C)

    佐藤 栄一, 岡山 朋子, 池田 敏彦, 内山 知実

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    Authorship:Coinvestigator(s) 

    研究の最終目標は、雪氷に強い出力1kW以下の小型水車を開発し実用化することであり、身近に存在する水路や小規模河川の水力エネルギー有効利用の拡大を図ることである。そこで本研究では、開発に適した実験用水路を特定し、実証実験により雪氷まじりの水流に対しても安定して発電可能な水車発電システムを開発することを目的とする。2019年度は、実証実験場所として特定した長野県信濃町の水路について詳細な観測を行う。2020年度は下掛け水車を設計・製作して水路に実装し、雪氷の有無による水車の性能評価を行う。また、排雪板による雪氷対策を検討する。2021年度は雪氷に強い小型水車の最適化と雪氷対策の改良を行う。
    研究の最終目標は、雪氷に強い出力1kW以下の小型水車を開発し実用化することであり、身近に存在する水路や小規模河川の水力エネルギー有効利用の拡大を図ることである。そこで本研究では、開発に適した実験用水路を特定し、実証実験により雪氷まじりの水流に対しても安定して発電可能な水車発電システムを開発することを目的とする。
    令和2年度は令和1年度の研究を継続し、長野県信濃町の用水路に実装した下掛け水車を用いて無雪期間と積雪期間の性能評価実験を行った。無雪期間は、水車ランナーの手間に備えた集水板付近の複雑な流れを把握するために、集水板と水車ランナーの間及びランナーの後方に平行部を新たに設け、各流水断面の水位と流速を測定した。流速に関しては、2成分4方向の測定が可能な電磁式流速計を備えて流下方向xと横断方向yの流速を同時に測定した。その結果、集水板の絞り口後方に単位幅流量が最大となる支配断面が存在し、その位置に本来置かれている水車ランナーが効率良く水力エネルギーを受けていることが判った。また、積雪期間の性能評価実験では、直径13cmから30cmまでの4種類の雪玉を作り、それを3秒の時間間隔で流下させた場合の水車効率と雪玉の挙動との関係を調べた。実験に際して、カメラは水車ランナーの前方、後方及び上部に置き、三方向から撮影を行った。また、水車の発電出力波形により水車の稼働状況を把握できることが判った。
    水車ランナーの手前に備えた集水板付近の複雑な流れを把握するために、集水板と水車ランナーの間及びランナーの後方に平行部を設け、各流水断面の水位と流速を詳細に調べる実験を行った。これは当初の計画には無かった項目であるが、この測定により集水板の効果が明らかとなり、水車パラメータの最適値を求める上での課題が解決した。また、当初の計画どおり積雪期間に雪塊・氷塊を模擬する雪玉を作って流下させる実験を行い、水車効率と雪玉の挙動との関係を調べることができた。
    2020年度の研究を継続し、水車ランナーの羽根枚数、堰板の高さなど雪氷に強い下掛け水車のパラメータの最適値を求める。また、積雪期間の実験において、水車上流に付設した排雪板の各種条件に対する水車の効率、雪玉の挙動との関係を調べる。

  4. 渦輪による気泡塊の創成と輸送に関する研究

    2018.4

    科学研究費補助金  基盤研究(C)

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    Authorship:Principal investigator 

  5. 渦輪による気泡塊の創成と輸送に関する研究

    2018.4

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Grant type:Competitive

  6. Study on the generation and transport of bubble cluster by a vortex ring

    Grant number:18K03924  2018.4 - 2021.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Uchiyama Tomomi

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    Authorship:Principal investigator 

    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

    A study searching for the generation and transport of a bubble cluster by a vortex ring is carried out. A vortex ring is launched vertically upward into a water tank by discharging the water from a cylinder mounted at the bottom of the tank with a piston. Air bubbles are injected into the vortex ring from a needle attached to the cylinder outlet. The cylinder inner diameter and the piston stroke are 42.5 mm and 100 mm, respectively. The mean diameter of the bubbles is 3.4 mm. When the strength of the vortex ring is large than a critical value, the bubbles are entrained in the vortex core and form a cluster. The entrained bubbles are successfully transported by the convection of the vortex ring. The convection velocity of the vortex ring is scarcely affected by the entrained bubbles, but the radius is enlarged slightly.

  7. Elucidation of lubrication phenomena involving additives by multiscale simulations and QCM measurements

    Grant number:17H03164  2017.4 - 2020.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    Zhang Hedong

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    Authorship:Coinvestigator(s) 

    Aiming at elucidation of additives containing lubrication phenomena between corrugated sliding surfaces, we established coarse-grained molecular dynamics simulations for formation, shear-induced desorption, and replenishment of adsorbed films of additives in nanoscale spacings, and simulations for the flow of lubricating oil within and near microscale contacting surfaces. Integrating the two types of simulations, we established multiscale simulations. Based on the knowledge obtained from the simulations, we designed and synthesized a new type of additive molecules and verified its excellent adsorption performance with the quartz crystal microbalance method.

  8. Numerical study for the effects of the submicron-scale surface roughness on the dynamic behavior

    Grant number:16K06070  2016.4 - 2019.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    SETA Takeshi, TAKANO Noboru

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    Authorship:Coinvestigator(s) 

    The smoothed profile-lattice Boltzmann method is proposed to determine the contact line dynamics on a hydrophobic or a hydrophilic curved wall. Two types of smoothed indicator functions are introduced, namely a function that identifies the solid domain for non-slip and non-penetration conditions and a function that denotes the boundary layer for no mass-flux and the wetting boundary conditions. In order to implement the Neumann boundary conditions for the order parameter and the chemical potential, the fluxes from the solid surfaces are distributed to relevant physical valuables through a smoothed profile. Several numerical investigations demonstrate the efficiency of the present method in calculating the contact angle of a droplet on curved surfaces with wall impermeability. The present model provides a simple algorithm to compute the surface normal vector and contact line dynamics on an arbitrarily shaped boundary by using a smoothed-profile.

  9. 異物通過性に優れたマイクロプロペラ水車の開発

    2016.4 - 2018.3

    科学研究費補助金  挑戦的萌芽研究

    内山 知実

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    Authorship:Principal investigator 

  10. Development of a propeller-type hollow micro-hydraulic turbine with excellent performance in passing foreign matter

    Grant number:16K14155  2016.4 - 2018.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Exploratory Research

    Uchiyama Tomomi

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    Authorship:Principal investigator 

    Grant amount:\3640000 ( Direct Cost: \2800000 、 Indirect Cost:\840000 )

    The present study develops a propeller-type micro-hydraulic turbine that passes foreign matter excellently. The turbine employs a runner with four blades embedded in a pipe. The runner includes a circular hollow around the central axis that allows foreign matter to pass freely. The hollow is made possible because the innovative design has no rotating shaft. The turbine efficiency and the ability to pass foreign matter were explored using a laboratory experimental setup. Polyester fibers were introduced into the water flow to simulate foreign matter. The experiments clarified the effects of hollow diameter, blade shape and guidevane on the turbine efficiency and foreign matter passage performance.

  11. 異物通過性に優れたマイクロプロペラ水車の開発

    2016.4 - 2018.3

    日本学術振興会  科学研究費助成事業  挑戦的萌芽研究

    内山 知実

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    Authorship:Principal investigator  Grant type:Competitive

  12. 渦輪による気泡群の生成と輸送に関する研究

    2013.4 - 2016.3

    科学研究費補助金  基盤研究(C)

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    Authorship:Principal investigator 

  13. Development of eco-friendly hydraulic turbine for extremely low head by hybrid simulation

    Grant number:25420111  2013.4 - 2016.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    IKEDA Toshihiko, IIO Shouichiro, UCHIYAMA Tomomi

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    Authorship:Coinvestigator(s) 

    This study was focused on improvement of an open type cross-flow runner performance and feasibility study to simulate its vibration and noise with both of MPS method and experiment. The simulation employs a two-dimensional particle method. Flow in the turbine is successfully simulated, with the simulated turbine performance showing good agreement with experimental measurements. On the other hand, the noise and vibration could not be simulated accurately. We tried to calculate time history pressure on the surface of blades for estimation of these characteristics. However, too large pressure fluctuation was frequently occurred, and these characteristics could not obtain reasonable values. The problem may be caused by abnormally contacting between water type particles and wall type particles.

  14. 渦輪による気泡群の生成と輸送に関する研究

    2013.4 - 2016.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Grant type:Competitive

  15. Control of air bubble cluster by a vortex ring launched into still water

    Grant number:25420114  2013.4 - 2016.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Uchiyama Tomomi

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    Authorship:Principal investigator 

    Grant amount:\5200000 ( Direct Cost: \4000000 、 Indirect Cost:\1200000 )

    An experimental study searching for the possible generation and transport of a bubble cluster by a vortex ring in water is performed. A vortex ring is launched vertically upward into a water tank by discharging the water from a cylinder mounted at the bottom of the tank with a piston. Air bubbles are successively injected into the vortex ring from a needle attached to the cylinder outlet. The generation of bubble cluster and transport of the cluster by the vortex ring can be classified according to the strength of the vortex ring and the air volumetric flow rate. When the strength of the vortex ring is low, the bubbles are less affected by the vortex ring and instead rise with the buoyant force at a higher velocity than the vortex ring. With an increase in the strength of the vortex ring, the bubbles are entrained in the vortex core and form a cluster. The convection velocity of the vortex ring is scarcely affected by the entrained bubbles, but the radius is enlarged slightly.

  16. 気泡噴流に対する三次元渦法の開発と並列計算システムの構築

    2007.4 - 2009.3

    科学研究費補助金  基盤研究(C)

    内山知実

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    Authorship:Principal investigator 

  17. 気泡噴流に対する三次元渦法の開発と並列計算システムの構築

    2004.4 - 2006.3

    科学研究費補助金  基盤研究(C)

    内山知実

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    Authorship:Principal investigator 

  18. 柱状物体まわりの気液二相流に対する三次元渦法の開発と実験による検証に関する研究

    2002.4 - 2004.3

    科学研究費補助金  基盤研究(C)

    内山知実

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    Authorship:Principal investigator 

  19. ニューラルナットワークを用いた気液二相流の流量測定エキスパートシステムの開発

    2000.4 - 2002.3

    科学研究費補助金  奨励研究

    内山知実

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    Authorship:Principal investigator 

  20. ニューラルネットワークを用いたポンプ系の異常運転診断法

    1995.4 - 1996.3

    科学研究費補助金  奨励研究

    内山知実

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    Authorship:Principal investigator 

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Industrial property rights 7

  1. 流動情報通信装置

    内山知実

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    Applicant:国立大学法人名古屋大学

    Application no:2018-129481  Date applied:2018.7

    Country of applicant:Domestic  

  2. 小型水力発電装置

    内山知実

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    Applicant:名古屋大学

    Application no:2017-043135  Date applied:2017.3

    Country of applicant:Domestic  

  3. 中空羽根車およびそれを用いた発電装置

    内山知実,井手由紀雄

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    Applicant:内山知実,井手由紀雄

    Application no:特願2013-081716  Date applied:2013.4

    Country of applicant:Domestic  

  4. グリッドフリー手法を用いた固気二相流シミュレーションプログラム及びそれを記憶した記憶媒体ならびに固気二相流シミュレーション装置

    内山知実

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    Applicant:内山知実

    Application no:特願2008-030193  Date applied:2008.2

    Country of applicant:Domestic  

  5. 気泡流の解析方法,気泡流シミュレーションプログラムおよびそれを記憶した記憶媒体ならびに気泡流シミュレーション装置

    内山知実,出川智啓

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    Applicant:国立大学法人名古屋大学

    Application no:特願2004-272011  Date applied:2004.9

    Patent/Registration no:特許第4032123号  Date registered:2007.11 

    Country of applicant:Domestic  

    液相中に微小な気泡が存在し,相互作用を及ぼし合いながら流れる気泡流に対する,解析方法,シミュレーションプログラム,記憶媒体およびシミュレーション装置を発明した.

  6. 流動情報通信装置

    内山知実

     More details

    Applicant:国立大学法人名古屋大学

    Application no:2018-129481  Date applied:2018.7

  7. 小型水力発電装置

    内山知実

     More details

    Applicant:名古屋大学

    Application no:2017-043135  Date applied:2017.3

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Teaching Experience (On-campus) 1

  1. Information Literacy

    2011

Teaching Experience (Off-campus) 2

  1. 計算流体工学

    2008.4 - 2009.3 名城大学)

  2. 計算流体工学

    2007.4 - 2008.3 名城大学)