2023 Fiscal Year Final Research Report

Innovation of particle method for solid-liquid multiphase flow model by introducing SPS mass transport model

Research Project

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Project/Area Number	21H01433
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 22040:Hydroengineering-related
Research Institution	Kyoto University
Principal Investigator	Gotoh Hitoshi 京都大学, 工学研究科, 教授 (40243068)
Co-Investigator(Kenkyū-buntansha)	原田英治京都大学, 工学研究科, 教授 (00362450) Khayyer Abbas 京都大学, 工学研究科, 准教授 (80534263) 五十里洋行京都大学, 工学研究科, 准教授 (80554196) 清水裕真京都大学, 工学研究科, 助教 (20869705)
Project Period (FY)	2021-04-01 – 2024-03-31
Keywords	固液混相流 / 粒子法 / SPS質量輸送モデル / 拡散方程式 / 激甚土砂災害
Outline of Final Research Achievements	Computational mechanics based on multiphase flow and granular mechanics is the key to break through the limitations of movable-bed hydraulic experiments due to similarity constraints, and is also the key to a deeper understanding of the mechanisms of disasters. In recent years, it has become possible to perform coupled analyses in which the continuous phase is treated by the particle method and the dispersed phase by the distinct element method, but the actual dispersed phase covers a wide range of scales from large gravels to fine sediment, and the effect of fine sediment must still be neglected due to limitations in computer capability. In this study, accurate particle methods were developed to investigate the mechanism of damage to structures caused by violent flows, based on the SPS mass transport model, which can reasonably incorporate the effects of fine sediment into mechanical models even under the limitations of the current computer capability.
Free Research Field	海岸工学，数値流体力学
Academic Significance and Societal Importance of the Research Achievements	激甚災害の多くは土砂災害を伴うので，防災には土砂災害のメカニズムの解明が焦眉である．土砂災害で問題となるのは土塊の移動開始や停止の過程であり，固相と液相を個別に扱える混相流解析が必須である．本研究で主軸とする粒子法は，土塊モデルとしての粒状体モデルとの馴染もよく，土砂災害のメカニズムに関する難題解決の切り札と言える手法で，本研究の学術的意義・社会的意義はともに大きい．