Faculty Profiles - NAKAMURA Tomoaki

Presentations -

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Numerical simulation of local scouring around inland structure due to run-up tsunami using three-dimensional coupled fluid-structure-sediment interaction model

Nakamura, T. and Mizutani, N.

24th CFD Symposium, JSFM

Three-dimensional numerical simulation on stability of superficial sediments of artificial shallow and wave-induced pressure fluctuation in shallow

Nakamura, T., Shinoda, Y., and Mizutani, N.

65th JSCE Annual Meeting, JSCE

Study on development of three-dimensional coupled fluid-structure-sediment interaction model and its application to local scour around submerged movable object

Nakamura, T. and Mizutani, N.

JSMF Annual Meeting 2010, JSMF

Event date： 2010.7

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan

The purpose of this paper is to develop a three-dimensional coupled fluid-structure-sediment interaction model (FSSM), which is composed of an extended Navier-Stokes solver with a volume of fluid module for air-water interface tracking, an immersed boundary module for structure motion tracking, and a sediment transport module for sediment surface tracking. FSSM is applied to wave-induced local scour around a submerged movable object. The computational capability of FSSM is demonstrated against experimental data.

Three-dimensional numerical analysis on deformation of run-up tsunami and tsunami force acting on square structures International conference

Nakamura, T., Mizutani, N., and Fujima, K.

International Conference on Coastal Engineering, ASCE

Event date： 2010.7

Language：English Presentation type：Oral presentation (general)

Country：China

A three-dimensional two-way coupled fluid-sediment interaction model (FSM) is applied to investigate run-up tsunami deformation and tsunami force acting on square structures on land. The FSM consists of a generalized Navier-Stokes solver (GNS) for multi-phase flow including porous flow, a volume of fluid module (VFM) for air-water interface tracking, and a sediment transport module (STM) for fluid-sediment interface tracking. In the FSM, a two-way coupling procedure is implemented at each time step to connect the GNS with the VFM and the STM. The predictive capability of the FSM is demonstrated through comparison between numerical results and experimental data in terms of water surface elevation, inundation depth, and tsunami force. The process of tsunami run-up in the presence of square structures is investigated in terms of vortex structures. The result shows that the FSM is a useful tool providing detailed information in discussing run-up tsunami deformation and tsunami force.

Reflection and run-up of tsunami on quay wall and behavior of drifted vessels due to tsunami International conference

Mizutani, N., Nakamura, T., and Koike, T.

International Conference on Coastal Engineering, ASCE

Three-dimensional numerical analysis on stability of artificial mound and pressure fluctuation in mound

Shinoda, Y., Nakamura, T., and Mizutani, N.

JSCE Chubu Branch Annual Meeting 2009, JSCE Chubu Branch

Discussion on development of three-dimensional numerical model for advection-diffusion phenomena of suspended sediment and its application

Nakamura, T. and Mizutani, N.

JSCE Chubu Branch Annual Meeting 2009, JSCE Chubu Branch

Discussion on flow velocity and pressure fluctuation on surface of shallow

Ishihara, R., Nakamura, T., and Mizutani, N.

JSCE Chubu Branch Annual Meeting 2009, JSCE Chubu Branch

Three-dimensional numerical simulation on deformation of run-up tsunami and tsunami force acting on structures

Nakamura, T., Mizutani, N., and Fujima, K.

23th CFD Symposium, JSFM

Event date： 2009.12

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan

A three-dimensional two-way coupled fluid-sediment interaction model (FSM) is applied to tsunami run-up around fixed impermeable square structures on a coastal area. FSM is composed of a generalized Navier-Stokes solver (GNS) to compute incompressible viscous air-water multi-phase flow including porous flow inside porous media, a volume of fluid module (VOF) to track air-water interface motion, and a sediment transport module (STM) to track fluid-sediment interface motion due to bed-load sediment transport. In FSM, STM is incorporated into GNS with VOF using a two-way coupling scheme to ensure the fluid-sediment interaction. To verify the validity of FSM, numerical results computed using FSM are analyzed and compared with experimental data measured in hydraulic tests. The predictive capability of FSM is demonstrated in terms of water surface elevations in the shallow water region, inundation depth on the land, and tsunami force acting on the structures. The vortex structure computed using FSM is visualized based on the λ<sub>2</sub> definition to investigate the process of the tsunami run-up.

Three-dimensional numerical simulation on local scour in front of quay wall due to jet flow

Nakamura, T., Shinoda, Y., and Mizutani, N.

64th JSCE Annual Meeting, JSCE

Study on reflection and run-up of tsunami due to quay wall

Mizutani, N., Nakamura, T., Koyasu, Y., and Yeom, G.-S.

64th JSCE Annual Meeting, JSCE

Local scour in front of quay wall caused by bow thruster and its countermeasure using filter units International conference

Mizutani, N., Nakamura, T., Shinoda, Y., and Koyama, H.

19th International Offshore and Polar Engineering Conference, ISOPE

Event date： 2009.6

Language：English Presentation type：Oral presentation (general)

Country：Japan

This study is intended to investigate local scour in front of a quay wall and its generation mechanism. Hydraulic model experiments have been conducted to investigate the local scour in front of quay wall. Also, countermeasures against local scour using armor stones and filter units are investigated based on the experiment. To consider the mechanism of local scour, numerical simulation has been conducted. The numerical computation method employed in this study includes a flow simulation insi

バウスラスターによる岸壁直下の局所洗掘とその対策工に関する研究

篠田陽介，中村友昭，水谷法美

平成20年度土木学会中部支部

体積力型埋め込み境界法に基づく流体・構造連成数値シミュレーションに関する一考察

中村友昭，水谷法美，小池　竜

土木学会第63回年次学術講演会

Tsunami-induced local scour around a square structure International conference

Nakamura, T., Kuramitsu, Y., and Mizutani, N.

Solutions to Coastal Disasters 2008, ASCE

Event date： 2008.4

Language：English Presentation type：Oral presentation (general)

Country：United States

Tsunami-induced local scour around a land-based structure with a square cross-section on a sand foundation was investigated with both laboratory experiments and numerical simulations. An isolated long wave was adopted as an incident tsunami wave. In the hydraulic model experiments, it was found that the maximum scour depth at the seaward corner of the structure was sensitive to the relative overtopping height of the tsunami wave. In the numerical simulations, it was revealed that the local sc

陸上津波によるコンテナの漂流と漂流衝突力に関する研究

水谷法美，廉　慶善，宇佐美敦浩，中村友昭，白石和睦

第20回海洋工学シンポジウム

応力変動の影響を考慮した遡上津波による地形変化シミュレーションに関する一考察

中村友昭，水谷法美

平成19年度土木学会中部支部

Effects of pore water pressure on scour - in case of local scour due to runup tsunami - International conference

Nakamura, T., Mizutani, N., and Kuramitsu, Y.

Geomorphological Comparative Research on Natural Disaster Mitigation in the Coastal Regions of Tropical Asia

Event date： 2007.11

Language：English Presentation type：Oral presentation (general)

Country：Thailand

Large-scale sediment transport due to the 2004 Indian Ocean Tsunami resulted in substantial erosion and scour around many structures. In this paper, we investigated tsunami-induced local scour around a land-based structure with a square cross-section on a sand foundation with both hydraulic model experiments and numerical simulations capable of computing interactions between tsunami waves and sand beds composed of nonlinear materials. In the hydraulic model experiments, we found that local sco

Three-dimensional numerical analysis on runup tsunami deformation around containers on an apron and tsunami-induced wave pressure acting on the containers International conference

Nakamura, T., Shiraishi, K., Usami, A., Mizutani, N., Miyajima, S., and Tomita, T.

Asian and Pacific Coasts 2007

Event date： 2007.9

Language：English Presentation type：Oral presentation (general)

Country：China

Many drifting debris resulted from a series of devastating tsunamis triggered by the Sumatra-Andaman earthquake. In recent years, a huge demand for container ships leads to the increase in containers piled up on an apron. Once such a huge tsunami strikes a port area, it is possible that drifting containers cause severe destructions of port facilities. In this study, runup tsunami deformation around containers fixed on an apron is investigated with a three-dimensional numerical simulation. It

陸上遡上津波による矩形構造物周辺の局所洗掘と砂地盤内部の応力変動に関する一考察

中村友昭，倉光泰樹，水谷法美

土木学会第62回年次学術講演会

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