爆風による破片飛散の大規模シミュレーション

抄録

In an accident such as gas explosion, the flying debris is most harmful to human body compare to the blast wave. Fluid-structure interaction is indispensable in analysis the dynamics of explosions, which is important in life-saving and disaster prevention. In this paper, a large-scale fluid-structure interaction simulation of debris driven by blast wave using an improved immersed boundary method is presented. Our method couples a grid-based compressible fluid simulation and Distinct Element Method with immersed boundary method. Improvement of the existing immersed boundary method is proposed to provide much accurate calculation for the simulation with high velocity. Multiple GPUs is utilized in the implementation of our simulation code to achieve high efficiency. Simulation results using 750 x 750 x 600 grid points of an explosion with several kinds of objects is provided to show the usability of our method.