2018 年 5 巻 1 号 p. 1-16
A 3-dimensional large-scale Fluid-Structure Interaction (FSI) framework is developed for the simulation of strength of the coastal structures to withstand tsunami. One-way coupling is used in this framework. Moving Particle Simulation (MPS) is adopted for fluid computations involving free surface flow and Finite Element Method (FEM) is adopted for structural computations. To achieve high parallel efficiency and reduce development costs, the open parallel source named ADVENTURE_Solid is used as the structural analysis solver and LexADV_EMPS is used as fluid analysis solver. Since our proposed framework combines two different numerical methods: FEM and MPS, and distribution of physical values in their methods are differently expressed; therefore interpolation related to fluid forces on fluid-structure interface is required. Accuracy of the interpolation directly affects reliability of result obtained by the FSI simulation. In this study we propose three interpolation methods and quantitatively evaluate their accuracies by solving a benchmark test case. In addition, using an interpolation method that achieves highest accuracy among the three methods, we perform a large-scale parallel FSI simulation of a nuclear power station subjected to a tsunami wave to demonstrate applicability of our proposed framework.
