研究者詳細 - 赤穗　良輔

論文 - 赤穗　良輔

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非構造三角形格子に基づく津波数値解析のGPGPUによる高速化査読

曾新翔, 赤穗良輔, 石川忠晴, 中村恭志

土木学会論文集B1(水工学) 69 ( 4 ) I_619 - I_624 2013年2月

中国の双台湿地葦原における灌漑期後の土壌水分変化査読

林倩, 石川忠晴, 赤穗良輔, 楊鳳林, 張樹深

土木学会論文集B1(水工学) 69 ( 4 ) I_529 - I_534 2013年2月

Rapid Tsunami Simulator on GPU using Unstructured Mesh System 査読

Xinxiang Zeng, Takashi Nakamura, Ryosuke Akoh, Tadaharu Ishikawa

PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS III AND IV 2013年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：TSINGHUA UNIV

The powerful Tsunami triggered by 2011 Tohoku earthquake (also known as the Great East Japan Earthquake) have attacked Japan's northeast Pacific coast and caused tremendous devastation there. The run-up Tsunami were observed in rivers connecting with Pacific Ocean and even intruded into inland of northeast Japan which was expanded the extent of the damages indeed. In that context, it is necessary to give accurate early warning to safeguard the populations from Tsunami. Meanwhile, detailed numerical analysis of run-up Tsunami in rivers using finer mesh is also a topic should be studied immediately. However, on account of the huge spatial scale, the computational load of Tsunami simulation tends to be too large to afford. Furthermore, it is essential to use finer mesh to reproduce the complex topography of coastline and rivers accurately. In order to overcome these difficulties, a rapid numerical simulator has been constructed by applying the GPGPU technology in solving the 2-dimensional shallow water equations. An explicit finite volume scheme is used to discrete the shallow water equations on unstructured triangular mesh system. Owing to the use of unstructured triangle mesh, the complex boundary such as coastline and river banks is represented well. With the power of GPGPU, real-time simulation of Tsunami movement is achieved, even though using finer meshes, which are small to 15 meters in rivers. Specifically, compared with a CPU, about 50-times speed-up is enabled even using a single GPU. For the sake of validating this simulator, a simulation of run-up Tsunami in Tone River caused by 2011 Tohoku earthquake is performed. Both of the arriving time of first wave and the wave height fit observation data very well.

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平成23年東北地方太平洋沖地震津波における利根川下流の津波遡上再現計算査読

赤穗良輔, 石川忠晴

土木学会論文集B1(水工学) 68 ( 4 ) I_1543 - I_1548 2012年2月

三角形格子におけるCIP有限体積法を用いた準三次元浅水乱流計算モデルの開発査読

赤穗良輔, 石川忠晴

水工学論文集 55 1207 - 1212 2011年2月

A multi-moment finite volume formulation for shallow water equations on unstructured mesh 査読

Ryosuke Akoh, Satoshi Ii, Feng Xiao

Journal of Computational Physics 229 ( 12 ) 4567 - 4590 2010年6月

非構造格子に基づく浅水流計算モデルの開発と数値実験査読

赤穗良輔, 肖鋒

水工学論文集 54 1153 - 1158 2010年2月

三角形非構造格子におけるCIP/Multi-Moment有限体積法による浅水波方程式の数値モデル査読

赤穂良輔, 伊井仁志, 肖鋒

日本計算工学会論文集 2008 20080013 2008年5月

A CIP/multi-moment finite volume method for shallow water equations with source terms 査読

R. Akoh, S. Ii, F. Xiao

International Journal for Numerical Methods in Fluids 56 ( 12 ) 2245 - 2270 2008年4月

Development of high performance simulator for tsunami 査読

Ryosuke Akoh, Satoshi II, Feng Xiao

SYSTEMS MODELING AND SIMULATION: THEORY AND APPLICATIONS, ASIA SIMULATION CONFERENCE 2006 29 - + 2007年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：SPRINGER-VERLAG TOKYO

Most of the existing numerical models for the simulation of Tsunami are based on the 2D shallow water equations. However, for many situations, it is necessary to use the 3D model in addition to the shallow water models to evaluate the damage in the coast region with a reliable accuracy. So, we propose the multi-scale warning system for Tsunami by coupling the 2D shallow water model and the 3D Navier-Stokes model that solves explicitly the free water surface to cover the physical phenomena that have diverse scales in both time and space. As a part of such a system, we, in this paper, present the essential numerics of the models based on the CIP/MM FVM (CIP/Multi-Moment Finite Volume Method) and some simulation results with the real geographical data for the 2D large-scale cases.

DOI： 10.1007/978-4-431-49022-7_6

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Unified formulation for compressible and incompressible flows by using multi-integrated moments II: Multi-dimensional version for compressible and incompressible flows 査読

Feng Xiao, Ryosuke Akoh, Satoshi Ii

Journal of Computational Physics 213 ( 1 ) 31 - 56 2006年3月

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