09:20 〜 09:35
[AHW20-03] Developement of a 2D Eulerian SPH shallow water model for dam break flows
キーワード：smoothed particle hydrodynamics, meshless, shallow water equations, dam break flow
In the study, we propose a two-dimensional (2D) Eulerian meshless shallow water model (SWM) using smoothed particle hydrodynamics (SPH) to simulate various dam break flows. The proposed Eulerian SPH-SWM can significantly improve the efficiency of the existing Lagrangian SPH-SWMs for handling real-world cases. To ensure the stability of the proposed model, an HLLC approximate Riemann solver and a hydrostatic reconstruction scheme are introduced to satisfy the well-balanced and positivity-preserving properties. Two study cases such as dam-break flows respectively on a dry flat bed and through a dry 45-degree bend channel are used to validate the proposed model against the exact and measured solutions. Finally, a scenario of the Shihmen dam in Taiwan broken is investigated to predict 3-hour-ahead flood extent to show the ability of the proposed model dealing with large-scale problems.