A VERIFICATION OF THE 2D-3D HYBRID TSUNAMI SIMULATION MODEL CONSIDERING THE WEAK-COMPRESSIBILITY OF THE MRT-LBM
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- SATO Kenta
- 東北大学大学院 工学研究科
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- KOSHIMURA Shunichi
- 東北大学 災害科学国際研究所
Bibliographic Information
- Other Title
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- MRT-LBMの弱圧縮を考慮した2D-3Dハイブリッド津波解析手法に関する数値的検討
- MRT-LBM ノ ジャク アッシュク オ コウリョ シタ 2D-3Dハイブリッド ツナミ カイセキ シュホウ ニ カンスル スウチテキ ケントウ
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Abstract
Free surface flow problems occur in numerous disaster simulations, such as tsunami inland penetration in urban area. Simulation models for these problems require non-hydrostatic, three-dimensional and highly resolved because of the higher-order physical phenomena. The lattice Boltzmann method (LBM) is an alternative simulation tool that is attracting as a fully explicit and efficient approach.In this regard, the LBM is considered to have an advantage over other methods when executing high-performance three-dimensional tsunami simulations. On the other hand, 2D-3D hybrid tsunami simulation method is required in a huge area. In the current study, we verified the weak-compressibility of the MRT-LBM for three-dimensional free surface models in classical benchmark problems. Moreover, we developed the 2D-3D hybrid tsunami simulation method considering the compressibility. Through the experiments, we substantiated that the weak-compressibility can be controlled with in the order of the Mach number squared. Besides, we demonstrated the proposal model can calculate 3D phenomena efficiently and accurately such as flows around obstacles by the classical dam-break benchmark.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 74 (2), I_175-I_180, 2018
Japan Society of Civil Engineers