Welcome to Matsumoto Lab

Computer simulation is indispensable in the design and development process of advanced devices, machineries and structures. Matsumoto Lab is dedicated to developments of advanced numerical methods of computer-aided engineering. We mainly focus on finite element method and boundary element method as the numerical methods, and develop sophisticated computation techniques and softwares, and apply them to various engineering applications as

energy harvesting simulations
thermo-piezoelectric harmonic vibration analyses of MEMS devices
eigenvalue analysis of vibrations of periodic structures
fast boundary element computation with graphic processor GPU
designs of phononic structures for preventing transmissions of noise
shape and topology optimizations of acoustic field
electromagnetic field using the fast-multipole boundary element method and level-set method
topology optimizations related to flow and fluid-structure interaction problems
developments of mechanical devices by using topology optimization techniques

etc.

Topology optimization of a maximum stiffness problem using BEM and level set-method.

Electric amplitude distributions of lasing states with spatial extension obtained by FEM.

Design sensitivity analysis for a spherical scatterer calculated by fast-multipole boundary element design sensitivity method.

Distribution of level set function and generated BEM mesh.

An eigenmode calculated by BEM nonlinear eigenvalue analysis.

Vibration analysis of concrete molding frame by FEM.

Announcement and News We are presenting papers at a number of domestic and international meetings. Also, we are releasing some useful softwares related to boundary element method and finite element method. The detailed list of publications are found in the research page.

A finite element software for time-harmonic vibration problem will be released soon.
Mar 26, 2013: Prof. T. Yamada (Kyoto Univ.) presented "Topological derivatives for stress related problems and their application to level set-based topology optimization" co-authored by T. Yamada (Kyoto Univ.), T. Matsumoto, K. Izui (Kyoto Univ.), S. Nishiwaki (Kyoto Univ.) at International Conference on Computational Mechanics (CM13) 25-27 March 2013, Durham, UK.
A new version of BEM software BEMAD for large-scale shape design sensitivity analyses of acoustic problems based on fast-multipole method was released in March 2011.
Mar 22, 2013: Haifeng Gao was awarded NCTAM2013 Presentation Award for his talk entitled "Analysis of band structure for 2D elastic phononic crystals by BEM" co-authored by H.F. Gao, T. Matsumoto, T. Takahashi, H. Isakari, and T. Takahashi at NCTAM2013: 62nd National Congress of Theoretical and Applied Mechanics, Tokyo, Japan.
Mar 4, 2013: Prof. T. Matsumoto presented "Level set-based topology optimizations with boundary element method" at The 1st NU-UM Faculty Workshop on Engineering, Nagoya University, Japan.
Mar 9, 2013: Haifeng Gao presented "Analysis of band structure for 2D elastic phononic crystals by BEM" co-authored by T. Matsumoto, T. Takahashi, and H. Isakari at the 62nd National Congress of Theoretical and Applied Mechanics, Tokyo Institute of Technology, Tokyo, Japan.
Feb 20, 2013: Presentations of graduation theses.
Feb 14-15, 2013: Presentations of master theses.
Dec 17, 2012: Haifeng Gao was awarded JASCOME Presentation Award for his talk entitled "Analysis of acoustic transmission for one directional periodic bounded structure in 2D by BEM" co-authored by H.F. Gao, T. Matsumoto, T. Takahashi, H. Isakari, and T. Takahashi at ICOME2012, Kyoto, Japan.
Dec 17, 2012: Prof. T. Yamada (Kyoto Univ.) presented "Topology optimization of elastic solid subjected to time-harmonic loads based on level-set method and BEM" coauthored by S. Shichi, T. Yamada, T. Matsumoto, and T. Takahashi at ICOME2012, Kyoto, Japan.
Dec 17, 2012: Prof. H. Isakari presented "On the Calderon preconditioning for periodic FMMs in acoustic-elastodynamic coupled problems" co-authored by Hiroshi Isakari and Naoshi Nishimura (Kyoto Univ.) at ICOME2012, Kyoto, Japan.
Dec 17, 2012: Haifeng Gao presented "Analysis of acoustic transmission for one directional periodic bounded structure in 2D by BEM" co-authored by H.F. Gao, T. Matsumoto, T. Takahashi, H. Isakari, and T. Takahashi at ICOME2012, Kyoto, Japan.
Oct 8-11, 2012: Haifeng Gao presented "Free vibration analysis of 3D elastic solids by BEM and SS method" co-authored by Haifeng Gao, Toshiro Matsumoto, and Toru Takahashi at the JSME 25th Computational Mechanics Conference (CMD2012), Kobe, Japan.
Oct 8-11, 2012: Haifeng Gao presented "Bandgap anlaysis for 2D acoustic phononic crystals based on BEM" co-authored by Haifeng Gao, Toshiro Matsumoto, Toru Takahashi, and Takayuki Yamada at the JSME 25th Computational Mechanics Conference (CMD2012), Kobe, Japan.
Oct 8-11, 2012: Kentaro Yaji (Kyoto Univ.) presented "A study of structural optimization using lattice Boltzmann Method" co-authored by Kentaro Yaji (Kyoto Univ.), Takayuki Yamada (Kyoto Univ.), Masato Yoshino (Shinshu Univ.), Toshiro Matsumoto, Kazuhiro Izui (Kyoto Univ.), and Shinji Nishiwaki (Kyoto Univ.) at the JSME 25th Computational Mechanics Conference (CMD2012), Kobe, Japan.
Sep 26-28, 2012: Kentaro Yaji (Kyoto Univ.) presented "A study of level set-based structural optimization using lattice Boltzmann method" co-authored by Kentaro Yaji, Takayuki Yamada (Kyoto Univ.), Masato Yoshino (Shinshu Univ.), Toshiro Matsumoto, Kazuhiro Izui (Kyoto Univ.), and Shinji Nishiwaki (Kyoto Univ.) at the JSME 22nd Design & Systems Devision Conference, Hiroshima, Japan.
Sep 10-14, 2012: Haifeng Gao presented "Determination of eigenfrequency for 3D acoustic cavity using BEM and contour integral method" co-authored by H.F. Gao, T. Matsumoto, T. Takahashi, T. Yamada at ECCOMAS2012, Vienna, Austria.
Sep 9-12, 2012: Prof. Takayuki Yamada (Kyoto Univ.) presented "A study of the optimum design of the locally resonant sonic materials using the level set based-topology optimization method" co-authored by Takayuki Yamada and Toshiro Matsumoto at the JSME Annual Conference 2012, Kanazawa, Japan.
Sept 4-7, 2012: Prof. Takayuki Yamada (Kyoto Univ.) presented "Generating structural configurations having a number of specified eigenfrequencies using a level set-based topology optimization method" co-authored by T. Yamada (Kyoto Univ.), T. Matsumoto, and S. Nishiwaki at the Eighth International Conference on Engineering Computational Technology, Dubrovnik, Croatia.
Sep 3-5, 2012: Haifeng Gao presented "Vibration analysis of vehicle cab by BEM with block SS method" co-authored by H.F. Gao, T. Matsumoto, T. Takahashi, T. Yamada at Beteq2012, Prague, Czech.
Aug 12-15, 2012: Prof. Takayuki Yamada (Kyoto Univ.) presented "Design of mechanical structures considering harmonic loads using level set-based topology optimization" co-authored by Takayuki Yamada, Toshiro Matsumoto, and Shinji Nishiwaki at the ASME 2012 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE 2012, Chicago, Illinois, USA.
Jul 9-12, 2012: Prof. Toshiro Matsumoto presented "BEM-based eigenfrequency analysis for plane acoustic problems using a path integral method" co-authored by Haifeng Gao, Toshiro Matsumoto, Toru Takahashi, and Takayuki Yamada at WCCM2012, Sao Paulo, Brazil.
Jul 9-12, 2012: Prof. Takayuki Yamada (Kyoto Univ.) presented "Sensitivity analysis and design of locally resonant phononic crystals" co-authored by Takayuki Yamada and Toshiro Matsumoto at WCCM2012, Sao Paulo, Brazil.
Jun 25-27, 2012: Prof. Toshiro Matsumoto presented "A study on topology optimization using level-set function and BEM" co-authored by T. Matsumoto, T. Yamada (Kyoto Univ.), S. Shichi1, and T. Takahashi1 at BEM/MRM 2012, Split, Croatia.
May 29-31, 2012: Prof. Toru Takahashi presented "An FMM for isogeometric BEM for potential problems in 2D" co-authored by Toru Takayashi, Yuya Nakai, and Toshiro Matsumoto at the 17th JSCES Conference, Kyoto, Japan.
May 29-31, 2012: Prof. Takayuki Yamada (Kyoto Univ.) presented "Topology optimization of elastic solids under time-harmonic loads based on level-set method and BEM" co-authored by Shinichiro Shichi, Takayuki Yamada, Toshiro Matsumoto, and Toru Takayashi at the 17th JSCES Conference, Kyoto, Japan.

FEM system for learners We have a finite element software FERITAS for learners. It can solve two-dimensional potential problems, linear elastostatic problems, and linear thermo-elastic problems. Linear triangular and quadrilateral elements can be used and the results are output also in graphic files of mesh, contour, and deformation diagrams in EPS format. The source code of FERITAS is fully commented so the learners can understand easily how to develop an FEM software. FERITAS for leaners can be offered upon personal request to Prof. Matsumoto. We also have a more advance version of FERITAS for 3D time-harmonic elastodynamic problems.
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Advanced fast BEM system BEMAD is a collection of boundary element solvers. It can solve Potential problems governed by Laplace's equation (steady-state heat conduction, electrostatics and magnetostatics, etc.), acoustic problems, elastostatic problems, time-harmonic elastodynamic problems, time-harmonic linear piezoelectric vibration, thermoelastic problems with temperature dependent material properties. The solver for the Helmholtz equation is written based on the wide-band fast-multipole boundary element method. The solver can be used in topology optimization problems.
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Viewer for FEM and BEM AKIMESH is a post-processing software that can be used for FERITAS, BEM, and a topology optimization solver that is developed in our group. It can display a finite element mesh, boundary element mesh, contour image of a scalar function distribution on the boundary, deformation of the model, and cross section image of entire mesh model. It can also display the distribution of the values of the level-set function, which is define in a fixed design domain, together with the embedded boundary element mesh. Original version of AKIMESH has been written by Akihisa Suzuki, who is one of alumni of our group.
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Journal papers

"Analysis of band structure for 2D acoustic phononic structure by BEM and the block SS method", Haifeng Gao, Toshiro Matsumoto, Toru Takahashi, Hiroshi Isakari, CMES, (2013), (accepted for publication).
"Detect damages in conical shells using curvature mode shape and wavelet finite element method", Jiawei Xiang, Toshiro Matsumoto, Yanxue Wang, Zhansi Jiang, International Journal of Mechanical Sciences, Vol.66, pp.83–93, (2013).
"A level set-based topology optimization method using the boundary element method in three dimension", Shinichiro Shichi, Takayuki Yamada, Akihisa Suzuki, Toshiro Matsumoto, Toru Takahashi, Transactions of JSME, Ser.C, Vol.78, No.785, pp.228-239, (2012-1).
"Study on electric intensity dependency of laser action in randomly distributed dielectric rod", Garuda Fujii, Toshiro Matsumoto, Toru Takahashi, Takayuki Yamada, Takeshi Ueta, The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and Systems Society, Vol.132(1), pp.89-95, (2012-01-01).
"Topology optimization of elastic solid subjected to time-harmonic loads based on level-set method and BEM", Shinichiro Shichi, Takayuki Yamada, Toshiro Matsumoto, Toru Takahashi, Transactions of the Japan Society for Computational Methods in Engineering, Vol.12, pp.1-6, (2012).
"Finite element analysis of laser modes within photonic random media", G. Fujii, T. Matsumoto, T. Takahashi, T. Ueta, Journal of Physics B: Atomic, Molecular and Optical Physics, Vol.45, 085404, doi:10.1088/0953-4075/45/8/085404, (2012).
"Study on transition from photonic-crystal laser to random laser", G. Fujii, T. Matsumoto, T. Takahashi, T. Ueta, Optics Express, Vol.20, Issue 7, pp.7300-7315, (2012).
"A study on the effect of filling factor for laser action in dielectric random media", G. Fujii, T. Matsumoto, T. Takahashi, T. Ueta, Applied Physics A, Vol.107, Issue 1, pp.35-42, (2012).
"3D acoustic shape sensitivity analysis using fast multipole boundary element method", C.J. Zheng, H.B. Chen, T. Matsumoto, T. Takahashi, International Journal of Computational Methods, Vol.9, No.1, pp.1240004-1-1240004-11, (2012).
"An application of fast multipole method to isogeometric boundary element method for Laplace equation in two dimensions", Toru Takahashi, Toshiro Matsumoto, Engineering Analysis with Boundary Elements, Vol.36, pp.1766-1775, (2012).
"An immersed boundary element method for level-set based topology optimization", Shintaro Yamasaki, Takayuki Yamada, Toshiro Matsumoto, International Journal for Numerical Methods in Engineering, Vol.36, pp.960-988, DOI: 10.1002/nme.4417, (2012).
"Topology optimization of elastic solid subjected to time-harmonic loads based on level-set method and BEM", Shinichiro Shichi, Takayuki Yamada, Toshiro Matsumoto, Toru Takahashi, Transactions of the Japan Society for Computational Methods in Engineering, Vol.12, No.01-121212, pp1-6, (2012).
"Analysis of acoustic transmission for one directional periodic bounded structure in 2D by BEM", Haifeng Gao, Toshiro Matsumoto, Toru Takahashi, Hiroshi IsakariTransactions of the Japan Society for Computational Methods in Engineering, Vol.12, No.01-121212, pp67-72, (2012).

Graduation ceremony (Mar.24, 2013)
Farewell party (Feb. 20, 2013)
Presentations of graduation theses (Feb. 20, 2013)
Presentations of master theses (Feb. 14-15, 2013)

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