Numerical Study of Fluid-Structure Interaction Dynamics under High-explosive Detonation on Massively Parallel Computers

Fluid-structure interaction dynamics under high-explosie detonation is widely used in engineering application, and its numerical simulation is also challenging due to the violent reaction of the blast. Based on the open source software and coupling library, we developed a solver to support the numerical simulation of fluid-structure interaction dynamics under high-explosie detonation, and carried out a case analysis. In the test case, the motion process of perpendicular elastic flap under high-explosive detonation is selected and the simulation time is 5ms. The transient results of the whole simulation process are given. We also tested the case in parallel, using two fluid meshes, that is, 972,000 cells (Mesh I) and 2,405,000 cells (Mesh II), and the scale of structure mesh is 2,000 cells. The results show that in the case of Mesh I, the maximum speedup ratio is 5.47 and the efficiency is 15.71% when the number of processes is 32. In the case of Mesh II, the maximum speedup ratio is 10.91 and the efficiency is 17.05% when the number of processes is 64.