Faculty Profiles - TAKAHASHI Toru

Papers - TAKAHASHI Toru

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Framework of acoustic analysis and shape optimization for three-dimensional doubly periodic multilayered structures

Jiang, FH; Takahashi, T; Zheng, CJ; Matsumoto, T; Chen, HB

JOURNAL OF COMPUTATIONAL PHYSICS Vol. 520 2025.1

Topology optimization of anisotropic structure for arbitrary objective functionals with exact free boundary representation

Cui, Y; Yang, WZ; Takahashi, T; Matsumoto, T

COMPUTERS & STRUCTURES Vol. 300 2024.8

Designing gradient coils with the shape derivative and the closed B-spline curves

Takahashi, T

MAGNETIC RESONANCE IMAGING Vol. 110 page： 112 - 127 2024.7

An electromagnetic shape optimisation for perfectly electric conductors by the time-domain boundary integral equations

Takahashi, T

ENGINEERING WITH COMPUTERS 2024.5

A time-domain boundary element method for the 3D dissipative wave equation: Case of Neumann problems Reviewed

Takahashi, T

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING Vol. 124 ( 23 ) page： 5263 - 5292 2023.12

A fast time-domain boundary element method for three-dimensional electromagnetic scattering problems Reviewed

Takahashi, T

JOURNAL OF COMPUTATIONAL PHYSICS Vol. 482 2023.6

An exact volume constraint method for topology optimization via reaction-diffusion equation

Cui, Y; Takahashi, T; Matsumoto, T

COMPUTERS & STRUCTURES Vol. 280 2023.5

A three-dimensional shape optimization for transient acoustic scattering problems using the time-domain boundary element method

Takahashi, T; Miyazawa, N; Tanigawa, M

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING Vol. 124 ( 2 ) page： 482 - 512 2023.1

A topology optimization of open acoustic waveguides based on a scattering matrix method

Matsushima, K; Isakari, H; Takahashi, T; Matsumoto, T

WAVE MOTION Vol. 113 2022.8

A robust topology optimisation for wideband structures in acoustic-elastodynamic coupled fields

Qin, JC; Isakari, H; Takahashi, T; Matsumoto, T

ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS Vol. 140 page： 544 - 561 2022.7

An isogeometric boundary element method for three-dimensional doubly-periodic layered structures in electromagnetics

Takahashi, T; Hirai, T; Isakari, H; Matsumoto, T

ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS Vol. 136 page： 37 - 54 2022.3

An enhancement of the fast time-domain boundary element method for the three-dimensional wave equation

Takahashi, T; Tanigawa, M; Miyazawa, N

COMPUTER PHYSICS COMMUNICATIONS Vol. 271 2022.2

A Shape Optimisation with the Isogeometric Boundary Element Method and Adjoint Variable Method for the Three-Dimensional Helmholtz Equation

Takahashi, T; Sato, D; Isakari, H; Matsumoto, T

COMPUTER-AIDED DESIGN Vol. 142 2022.1

A time-saving FEM-based approach for structural topology optimization with exact boundary representation

Cui, Y; Takahashi, T; Matsumoto, T

MECHANICAL ENGINEERING JOURNAL Vol. 9 ( 6 ) 2022

Topology optimization for incompressible viscous fluid flow using the lattice kinetic scheme

Xie, SQ; Yaji, K; Takahashi, T; Isakari, H; Yoshino, M; Matsumoto, T

COMPUTERS & MATHEMATICS WITH APPLICATIONS Vol. 97 page： 251 - 266 2021.9

A robust topology optimization for enlarging working bandwidth of acoustic devices

Qin, JC; Isakari, H; Taji, K; Takahashi, T; Matsumoto, T

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING Vol. 122 ( 11 ) page： 2694 - 2711 2021.6

A topology optimisation of composite elastic metamaterial slabs based on the manipulation of far-field behaviours

Matsushima Kei, Isakari Hiroshi, Takahashi Toru, Matsumoto Toshiro

STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION Vol. 63 ( 1 ) page： 231 - 243 2021.1

A numerical method for elastic wave scattering in multi-layered periodic media based on the scattering matrix and BEM

Matsushima, K; Isakari, H; Takahashi, T; Matsumoto, T

MECHANICAL ENGINEERING JOURNAL Vol. 8 ( 1 ) 2021

Level-set based topology optimization of transient flow using lattice Boltzmann method considering an oscillating flow condition

Nguyen Truong, Isakari Hiroshi, Takahashi Toru, Yaji Kentaro, Yoshino Masato, Matsumoto Toshiro

COMPUTERS & MATHEMATICS WITH APPLICATIONS Vol. 80 ( 1 ) page： 82 - 108 2020.7

Parallelization of the inverse fast multipole method with an application to boundary element method Reviewed

Toru Takahashi, Chao Chen, Eric Darve

Computer Physics Communications Vol. 247 2020.2

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

We present an algorithm to parallelize the inverse fast multipole method (IFMM), which is an approximate direct solver for dense linear systems. The parallel scheme is based on a greedy coloring algorithm, where two nodes in the hierarchy with the same color are separated by at least σ nodes. We proved that when σ ≥ 6, the workload associated with one color is embarrassingly parallel. However, the number of nodes in a group (color) may be small when σ = 6. Therefore, we also explored σ = 3, where a small fraction of the algorithm needs to be serialized, and the overall parallel efficiency was improved. We implemented the parallel IFMM using OpenMP for shared-memory machines. Successively, we applied it to a fast-multipole accelerated boundary element method (FMBEM) as a preconditioner, and compared its efficiency with (a) the original IFMM parallelized by linking a multi-threaded linear algebra library and (b) the commonly used parallel block-diagonal preconditioner. Our results showed that our parallel IFMM achieved at most 4 × and 11 × speedups over the reference method (a) and (b), respectively, in realistic examples involving more than one million variables.

DOI： 10.1016/j.cpc.2019.106975

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