※苗字と名前の間にスペースをあけ、入力してください

Yasushi Nakabayashi

Faculty
Department of Information Sciences and Arts
Research Institute of Industrial Technology
Center for Computational Mechanics Research
Course of Information Sciences and Arts
PositionProfessor
Mailnakabayashi[at]toyo.jp In case of sending E-mail, please alternate [at] to @
HomepageURL
Birthday
Last Updated :2019/05/16

Researcher Profile and Settings

Education

  •  - 1999 , The University of Tokyo, Graduate School, Division of Engineering, Information Engineering
  •  - 1994 , The University of Tokyo, Faculty of Engineering, Quantum Engineering and Systems Science

Degree

  • Ph.D. in Engineering, The University of Tokyo

Association Memberships

  • THE JAPAN SOCIETY OF MECHANICAL ENGINEERS
  • JAPAN SOCIETY FOR COMPUTATIONAL ENGINEERING AND SCIENCE
  • JAPAN SOCIETY FOR SIMULATION TECHNOLOGY

Academic & Professional Experience

  •   1999  - 2002 , Research Associate, Institute of Frontier
  •   2002 , - Lecturer, Toyo University
  •   1996  - 1999 , JSPS Research Fellow
  • Science, Univ. Tokyo

Research Activities

Research Areas

  • Informatics, Fundamental theory of informatics
  • Applied physics, Engineering fundamentals
  • Mechanical engineering, Fluid engineering

Research Interests

    Computational Fluid Dynamics, Network Computing, CAE System

Published Papers

  • Parallelization of Enriched Free Mesh Method for Large Scale Fluid-structure Coupled Analysis, Shinsuke Nagaoka, Yasushi Nakabayashi, Genki Yagawa, Procedia Engineering, 90, 288 - 293, Refereed
  • Radius Parallel Self-Organizing Map (RPSOM), M. MASUDA, Y. NAKABAYASHI and G. YAGAWA, Journal of Computational Science and Technology, 6, (1) 16 - 27, Refereed
  • Accurate fluid-structure interaction computations using elements without mid-side nodes, S. NAGAOKA, Y. NAKABAYASHI, G. YAGAWA and Y. J. KIM, Computational Mechanics, 48, (3) 269 - 276, Refereed
  • Fluid-Structure Coupled Analysis using Enriched Free Mesh Method, S. NAGAOKA, Y. NAKABAYASHI and G. YAGAWA, Key Engineering Materials, 462, 1238 - 1243, Refereed
  • Application of Crack Propagation Simulation to Crack Arrester, H. OSAKI, Y. NAKABAYASHI, G. YAGAWA and Y. J. KIM, Theoretical and Applied Mechanics Japan, 58, 3 - 8, Refereed
  • Efficient Computational Method for Ultra Large Scale Flow Analysis, The University of Tokyo, Refereed
  • Efficient Computational Strategy for the Large Scale Fluid Analysis, Yasushi Nakabayashi, Genki Yagawa and Shinobu Yoshimura, Structural Mechanics in Reactor Technology, 15, (2) 117 - 124, Refereed
  • Large-Scale Finite Element Fluid Analysis by Massively Parallel Processors, Genki Yagawa, Yasushi Nakabayashi and Hiroshi Okuda, Parallel Computing, 23, (9) 1365 - 1377, Refereed
  • Parallel finite element fluid analysis on an element-by-element basis, Yasushi Nakabayashi, Genki Yagawa and Hiroshi Okuda, Computational Mechanics, 18, (5) 377 - 382, Refereed
  • Large scale finite element fluid analysis by massively parallel processors, Yasushi Nakabayashi, Special Issue of EUROSIM, 559 - 569, Refereed

Misc

  • Introduction to Developing Applications for Smartphone-iOS vs. Android (3), SHIOYA Ryuji, NAKABAYASHI Yasushi, MIYACHI Hideo, 計算工学, 17,   2012 04 30
  • Introduction to Developing Applications for Smartphone : iOS vs. Android (4), SHIOYA Ryuji, NAKABAYASHI Yasushi, 計算工学, 17,   2012 07 31
  • Introduction to Developing Applications for Smartphone : iOS vs. Android (2), SHIOYA Ryuji, NAKABAYASHI Yasushi, 計算工学, 17,   2012 01 31
  • Introduction to Developing Applications for Smartphone : iOS vs. Android (1), SHIOYA Ryuji, NAKABAYASHI Yasushi, 計算工学, 16,   2011 10 31
  • SC2004 Attendee Report, NAKABAYASHI Yasushi, 計算工学 = Journal of The Japan Society for Computational Engineering and Science (JSCES), 10, (2) 1148 - 1149,   2005 04 30
  • Netowork Computing, NAKABAYASHI Yasushi, 計算工学, 7, (4) 580 - 583,   2002 10 31
  • ECCOMAS 2000, NAKABAYSHI Yasushi, 計算工学, 6, (1) 243 - 244,   2001 01 31
  • AHPCRC, University of Minnesota, NAKABAYASHI Yasushi, 計算工学 = Journal of The Japan Society for Computational Engineering and Science (JSCES), 2, (2) 127 - 130,   1997 06 30

Conference Activities & Talks

  • Comparison Between Experimental Result and Fluid-Structure Interaction Analysis using the Enriched Free Mesh Method, NAGAOKA Shinsuke, NAKABAYASHI Yasushi, TAMURA Yoshiaki, YAGAWA Genki, The Computational Mechanics Conference,   2014 11 22 , Fluid-structure interaction problem is becoming a very important issue in numerical analysis field. A lot of methods to solve this phenomenon are proposed by many researchers. Our proposed new method to solve fluid-structure interaction problem is combined the Enriched Free Mesh Method and the SUPG/PSPG stabilized Finite Element Method. This method is using only linear element but it can be obtained fine analysis result. On the other hand, no crucial benchmark test for fluid structure interaction problems is also available. Therefore, we also proposed new experiment for fluid structure interaction problem to establish a new benchmark test. In this paper, we described comparison between experimental result and analysis result to prove effectiveness of our proposed method.
  • Prediction of Analysis Result using Self-Organizing Map, Masuda Masato, Nakabayashi Yasushi, Tamura Yoshiaki, The Computational Mechanics Conference,   2014 11 22
  • 1304 Coupled Analysis of Vibration Phenomena and Classification by Self-Organizing Map, MASUDA Masato, NAKABAYASHI Yasushi, TAMURA Yoshiaki, The Computational Mechanics Conference,   2013 11 02
  • G011023 Parallel Fluid-Structure Coupled Analysis Method by EFMM, NAGAOKA Shinsuke, NAKABAYASHI Yasushi, YAGAWA Genki, Mechanical Engineering Congress, Japan,   2013 09 08 , We have been already proposed a new analysis method for fluid-structure coupled problem, which has nodal consistency at the fluid-structure interface and its calculation efficiency and accuracy are high. Our proposed method is using Enriched Free Mesh Method and SUPG/PSPG stabilized FEM. Enriched Free Mesh Method and SUPG/PSPG stabilized EFM have a very good chemistry because both methods are using linear tetrahedral element. However, Enriched Free Mesh Method has a shortcoming that is difficult to apply adaptive parallel analysis. So, in this paper, we describe a new treatment to apply Enriched Free Mesh Method into parallel analysis. Finally, verification result of our new treatment is also described.
  • Development of Free-Kick Support System using mnSOM, MASUDA Masato, NAKABAYASHI Yasushi, YAGAWA Genki, Transactions of the Japan Society for Computational Engineering and Science,   2013 , In this paper, the authors propose the Free-Kick Support System, which solves the inverse problem of the free-kick simulator. The free-kick simulator is the system which physically computes the motion of soccer ball by the information of ball position, velocity, rotating angle, rotating speed and the aerodynamic properties of soccer ball. Using the Neural Network (NN) and the Self-Organizing Map (SOM), the Free-Kick Support System solves the inverse problem of the free-kick simulator and the output is available for the practice of the free-kick and making a strategic plan of real soccer games. Furthermore, the authors propose the evaluation method of the modular network SOM (mnSOM) for quantitatively evaluating the learning effects, and show that the mnSOM is useful for the Free-Kick Support System.
  • Application of the EFMM to Parallel Fluie-Structure Coupled Analysis, NAGAOKA Shinsuke, NAKABAYASHI Yasushi, YAGAWA Genki, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan,   2013 ,  This paper proposes a new analysis method for fluid-structure coupled problem, which has nodal consistency at the fluid-structure interface and its calculation efficiency and accuracy are high.   Our proposed method is using a EFMM as a structure analysis method and SUPG/PSPG stabilized FEM as a fluid analysis method.These method have a very good chemistry in coupled analysis field. However our proposed method is difficult to introduce into parallel method. This is a problem due to the characteristics of the EFMM. In this paper, we also describe special handling for the introduction to parallel analysis of our proposed method.
  • 401 Fluid-Structure Coupled Analysis Using EFMM, NAGAOKA Shinsuke, NAKABAYASHI Yasushi, YAGAWA Genki, The Computational Mechanics Conference,   2011 10 08 , Since majority of phenomena which occur around us are coupled ones, the necessity for coupled analysis is well-known. In many computational mechanics studies, however, the coupled effect is disregarded because of the difficulty to consider it in a numerical computation. In other words, the coupled analyses are much complicated as compared with the non-coupled ones. We have employed the EFMM for this class of problems as this method has various advantages, for example, analysis accuracy improves sharply as compared with the FEM. In the present paper, we aim at conducting efficient coupled analysis, which does not use a middle-point node by using the present method.
  • 405 Speeding up of Incompressible Fluid Analysis System and its Application to the Environmental Problems, Nakabayashi Yasushi, TOMIYAMA Jun, The Computational Mechanics Conference,   2010 09 23
  • Application of Enriched Free Mesh Method to fluid-structure coupled analysis, 長岡 慎介, 中林 靖, 矢川 元基, 計算工学講演会論文集 = Proceedings of the Conference on Computational Engineering and Science,   2010 05
  • 2425 Validity of Coupled Analysis using EFMM, NAGAOKA Shinsuke, NAKABAYASHI Yasushi, YAGAWA Genki, The Computational Mechanics Conference,   2009 10 10 , Since majority of phenomena which occur around us are coupled ones, the necessity for coupled analysis is well-known. In many computational mechanics studies, however, the coupled effect is disregarded because of the difficulty to consider it in a numerical computation. In other words, the coupled analyses are much complicated as compared with the non-coupled ones. We have employed the EFMM for this class of problems as this method has various advantages, for example, analysis accuracy improves sharply as compared with the FEM. In the present paper, we aim at conducting efficient coupled analysis, which does not use a middle-point node by using the present method.
  • 1308 Simulation of crack propagation arrestability by a circular hole using neural network in an internal crack, OSAKI Hiroaki, NAKABAYASHI Yasushi, YAGAWA Genki, KIM Young Jin, The Computational Mechanics Conference,   2009 10 10
  • 403 Efficient fluid analysis code using GPU, Ochiai Kazuaki, Nakabayashi Yasusi, The Computational Mechanics Conference,   2009 10 10 , Recently, the computational performance of GPU is improving rapidly. The technology which uses the GPU for not visualization but general purpose calculation is called GPGPU, and the research using it are performed actively. In this paper, the authors use GPU for the CFD code for improving computational performance. The bottleneck point of CFD code is the calculation of matrix-vector products. Therefore, the authors use CUDA for improving the bottleneck. After some numerical tests, the performance of the CUDA based code is compared with the original CPU based code.
  • 818 Adaptation of the Self-Organizing Map to the Free-kick Support System, MASUDA Masato, NAKABAYASHI Yasushi, The Computational Mechanics Conference,   2009 10 10
  • OS0207 Evaluation of the crack arrester using the neural network in three point bending analysis, OSAKI Hiroaki, NAKABAYASHI Yasushi, YAGAWA Genki, KIM Yong Jin, M&M材料力学カンファレンス,   2009 07 24 , It is well known that the crack propagation in a structure is a serious problem from the structural integrity point of view. In order to prevent serious crack propagation, a circular hole is using as a crack arrester. This paper describes the application of a hierarchical neural network to the estimation of a crack arrester position in a solid with the FEM. We solve the 2D crack propagation problem in three point bending model. NN is used as a method of asking for a crack arrester position. It was shown that NN is very effective in prediction of crack arrester position.
  • Fluid-Structure Coupled Analysis Using EFMM, NAGAOKA Shinsuke, NAKABAYASHI Yasushi, YAGAWA Genki, 日本シミュレーション学会大会発表論文集 : シミュレーション・テクノロジー・コンファレンス・計算電気・電子工学シンポジウム,   2009 06 11
  • Examination of the crack arrester in a crack propagation simulation, Osaki Hiroaki, Nakabayashi Yasushi, Yagawa Genki, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan,   2009 , The crack propagation arrestability by circular hole is clarified using the Free Mesh Method analysis. In three point bending analysis, the case where a crack stops is clarified and a crack and circular hole relationship are examined.
  • Coupled Analysis Using Enriched Free Mesh Method, Nagaoka Shinsuke, Nakabayashi Yasushi, Yagawa Genki, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan,   2009 , Many of Phenomena which occur around us are Coupled ones. The necessity for Coupled analysis is very important, but in many cases, the Coupled effect is disregarded because of the difficulty in the numerical computation. In other words, the coupled analysis is much complicated as compared with the conventional analysis. In this research, we introduce the EFMM for this class of problems as this method has various advantages. For example, analysis accuracy improves sharply as compared with the FEM. We aim at conducting efficient coupled analysis which does not use a middle-point node by using the present method.
  • 856 Evaluation of Aerodynamic Properties of Soccer Ball using LES model, Nakabayashi Yasushi, Masuda Masato, Yoshimura Shinobu, The Computational Mechanics Conference,   2008 11 01
  • 739 Simulation of crack propagation arrestability by a circular hole using a neural network, Osaki Hiroaki, NAKABAYASHI Yasushi, YAGAWA Genki, The Computational Mechanics Conference,   2008 11 01
  • 625 A study of speed-up technique for matrix-vector products using CUDA, Ochiai Kazuaki, Nakabayashi Yasusi, The Computational Mechanics Conference,   2008 11 01
  • 533 Development of High Accuracy Free-Kick Support System using Self-Organization Map, MASUDA Masato, NAKABAYASHI Yasushi, The Computational Mechanics Conference,   2008 11 01
  • GS1001 Evaluation of the crack propagation in 2D plate with a hole using neural network, Osaki Hiroaki, NAKABAYASHI Yasushi, YAGAWA Genki, M&M材料力学カンファレンス,   2008 09 16 , 本研究では,き裂が進展する事により起こる破壊防止の為に,円孔によりき裂進展を阻止できるかどうか調べる事を目的としている。き裂進展解析としては円孔無し2次元試験片と円孔付き2次元試験片の3点曲げ解析を行った。き裂進展位置をニューラルネットワークで学習し,き裂進展位置の予測において、ニューラルネットワークが有効かどうか評価・検討した。
  • 21202 Prediction of the crack propagation direction with neural network, OSAKI Hiroaki, NAKABAYASHI Yasushi, YAGAWA Genki, 日本機械学会関東支部総会講演会講演論文集,   2008 03 13 , The purpose of this study is to prevent the destruction by crack propagation. The computational fracture mechanics requires frequent re-meshing as the crack propagating. In order to show the effectiveness of the Free Mesh Method (FMM) in crack propagation analysis, we solve the 2D crack propagation problems with the FMM. The method to predict the crack propagation direction will be proposed using Neural Network.
  • Evaluation of the crack propagation direction in the three point bending specimen using a neural network, Osaki Hiroaki, Nakabayashi Yasushi, Yagawa Genki, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan,   2008 , The purpose of this study is to prevent the destruction of a structure by the crack propagation. The computational fracture mechanics requires frequent re-meshing as the crack propagating. In order to show the effectiveness of the Free Mesh Method (FMM) in crack propagation analysis, we solve the 2D crack propagation problems with the FMM. The method to predict the crack propagation direction will be proposed using Neural Network.
  • 1022 Control of crack propagation using free mesh method and neural network, OSAKI Hiroaki, NAKABAYASHI Yasushi, YAGAWA Genki, The Computational Mechanics Conference,   2007 11 25 , This paper describes the 2D crack propagation analysis using the Free Mesh Method (FMM). The computational fracture mechanics involves frequent re-meshing as the crack propagating. In order to show the effectiveness of the FMM in crack propagation analysis, we solve the 2D crack propagation problems with the FMM. The method controlling the crack propagation will be proposed using Neural Network.
  • 1903 Development of High Accuracy Free-Kick Support System using Large Scale Fluid Analysis, MASUDA Masato, NAKABAYASHI Yasushi, The Computational Mechanics Conference,   2007 11 25 , The Free-kick Support System is the system that raises the score efficiency at the free kick. However, this system treated the aerodynamic properties as the constant so far. In this study, large scale fluid analysis around soccer ball are performed for evaluating aerodynamic properties of soccer ball. As a result, the Free-kick Support System will become more accurate for evaluating trajectory of soccer ball.
  • 626 Control of crack propagation with neural network, OSAKI Hiroaki, NAKABAYASHI Yasushi, YAGAWA Genki, M&M材料力学カンファレンス,   2007 10 24 , This paper describes the 2D complicated crack propagation analysis using the Free Mesh Method(FMM). The computational fracture mechanics involves frequent re-meshing as the crack propagates. In order to show the effectiveness of the FMM in crack propagation analysis, we study the 2D complicated crack propagation problems with the FMM. In order to show the effectiveness of the neural network in control of crack propagation analysis result.
  • Development of stress camera using cellular phone, 中林 靖, 布施 一穂, Proceedings of the conference on computational engineering and science,   2007 05
  • Research and development of free-kick support system, 増田 正人, 中林 靖, Proceedings of the conference on computational engineering and science,   2007 05
  • 2415 The diffusion simulation of particle contaminated material around human body, YAMAMOTO Masaaki, YOSHIMURA Shinobu, NAKABAYASHI Yasushi, The Computational Mechanics Conference,   2005 11 17
  • 2412 Environmental fluid simulation of Lake Inawashiro based on shallow water equations, MIYAMURA Tomoshi, Bunya Shintaro, Nakabayashi Yasushi, Yoshimura Shinobu, The Computational Mechanics Conference,   2005 11 17
  • 708 Evaluation of Aerodynamic Properties of Soccer Ball and its Application to Free Kick Support System, NAKABAYASHI Yasushi, MASUDA Masato, YOSHIMURA Shinobu, The Computational Mechanics Conference,   2005 11 17
  • 2703 Self-Learning of Walk Style of AIBO using Genetic Algorithm, NAKABAYASHI Yasushi, ASANO Masahiro, The Computational Mechanics Conference,   2005 11 17
  • 634 Multilevel Simulation of Diffusion Process of Particle Matter in the Air, YAMAMOTO Masaaki, YOSHIMURA Shinobu, NAKABAYASHI Yasushi, 年次大会講演論文集 : JSME annual meeting,   2005 09 18 , Aggravation of air pollution containing suspended particle matter (SPM) discharged from various sources is one of serious environmental problems. The simulation of diffusion behavior of SPM is performed, using the multilevel simulation of combining random walk of particles and parallel finite element air flow analysis.
  • A Coupled Analysis of Incompressible Fluid and Hard Sphere using ALE method, NAKABAYASHI Yasushi, The Computational Mechanics Conference,   2003 11 22 , The author is developing an incompressible viscous fluid analysis system (ADVENTURE_Fluid) which contains the Q1-P0 hexahedral element solver with the BTD method and matrix storage free technique and the P1-P1 tetrahedral element solver with the SUPG/PSPG stabilization method. In this paper, the author demonstrates a coupled analysis of incompressible fluid and hard sphere using the ALE method. Three mesh control strategies are compared for evaluating the efficiency and the suitability for parallel processing.
  • An Investigation of Efficient Parallelization Methods on SMP Clusters, NAKABAYASHI Yasushi, The Computational Mechanics Conference,   2002 10 30 , In this paper, the author investigates efficient parallelizeation methods on SMP clu7ster. At first, the author compares the performance of three communication libraries, MPICH, LAM and MPICH-GM. Then, the efficiency of OpenMP is tested using some numerical examples. Finally, the author shows the best approach for the parallelization of the finite element flow analysis. code.
  • 522 Numerical Simulation of Atmospheric Diffusion for Small Amount of Air Pollutants, IMAI Yoichi, YOSHIMURA Shinobu, NAKABAYASHI Yasushi, The Computational Mechanics Conference,   2001 11 27 , Diffusion of dioxin class into the environment has become one of serious social problems. More than 80% of such dioxin class is estimated to be discharged from trash incinerators and factories. There are several ways to solve the problems, In this study, we focus on the quantitative understanding of dioxin class diffusing from trash incinerators and factories into the atmosphere. Here incompressible fluid flow in the atmosphere is first calculated using the 3D finite element method. Then the diffusing process of contaminant particles with different weight is traced within the time dependent finite element solutions, and visualized.
  • LARGE SCALE PARALLEL FLUID ANALYSIS SYSTEM IN ADVENTURE PROJECT, NAKABAYASHI Yasushi, YOSHIMURA Shinobu, YAGAWA Genki, 計算工学講演会論文集,   2001 05 30
  • Ultra Large Scale Finite Element Fluid Analysis on PC Clusters, NAKABAYASHI Yasushi, YAGAWA Genki, YOSHIMURA Shinobu, The Computational Mechanics Conference,   2000 11 27 , In the paper, an efficient computational strategy for ultra large scale finite element fluid analysis on PC clusters was shown. The authors have developed the incompressible viscous fluid analysis system, which is suitable for Massively Parallel Processors and apply it to the PC cluster system. using the efficient parallel domain decomposition tool based on METIS and ParMETIS and the efficient parallel I/O method, high parallel performance was achieved on PC cluster environment. Some numerical examples were shown for estimating the parallel efficiency of the developed analysis system.
  • Structure-Fluid Coupled Analysis Using PC Cluster : Validation of Adventure Framework, NAKABAYASHI Yasushi, TANAKA Shinya, MIYAMURA Tomoshi, YOSHIMURA Shinobu, YAGAWA Genki, 年次大会講演論文集 : JSME annual meeting,   2000 07 31 , The authors are developing an advanced general-purpose computational mechanics system (ADVENTURE System) which can analyze a model of arbitrary shape with 10 to 100 million DOFs within 1 hour to 1 day using the fastest computer. In this project, the authors developed the framework of distributed CAE system for large scale problems and heterogeneous network topology (ADVENTURE Framework). To demonstrate fundamental performance of the framework, structure-fluid coupled analysis was performed.
  • Framework for Weak Coupling Analysis of Micromachine Behavior Using Blackboard Architecture, ISHIHARA Daisuke, YOSHIMURA Shinobu, NAKABAYASHI Yasushi, YAGAWA Genki, 年次大会講演論文集 : JSME annual meeting,   2000 07 31 , This paper describes a flamework for coupling analysis of micromachine behavior using blackboard airchitecture. To estimate micromachine's dynamic behaviors, its is required to simulate coupling phenomena among deformation, fluid flow, electromagnetics and heat conduction. The proposed flamework is designed to treate all of them. To prove its fundamental performance, the flamewark is applied to a simple structure-fluid coupling problem.
  • DEVELOPMENT OF ADVENTURE FRAMEWORK FOR PARALLEL AND DISTRIBUTED CAE SYSTEM, YOSHIMURA S., TANAKA S., WADA Y., MIYAMURA T., NAKABAYASHI Y., YAGAWA G., 計算工学講演会論文集,   2000 05 24
  • APPLICATION OF FINITE ELEMENT FLUID ANALYSIS TO ONE HUNDRED MILLION DEGREES OF FREEDOM PROBLEMS, NAKABAYASHI Yasushi, YAGAWA Genki, YOSHIMURA Sinobu, Proceedings of the conference on computational engineering and science,   1999 05 26

Works

  • ADVENTYURE Project

Research Grants & Projects

  • ADVENTYURE-ITBL Project, Cooperative Research
  • Development of Stress/Stream Camera using Real Time Simulation Technique, Grant-in-Aid for Scientific Research