4:00 PM - 4:15 PM
[STT51-03] Multi–physics tsunami disaster simulation for fluid-structure-soil interaction based on a particle method
Keywords:particle method, fluid-structure interaction, fluid-soil interaction, High viscus fluild simulation
In our study, a multi–physics tsunami simulator based on the Smoothed Particle Hydrodynamics (SPH) Method has been developed. The SPH is widely used in field of fluid and solid dynamics, and a stabilized ISPH has been developing to treat the coupling behavior among fluid-structure-soil mechanics. A coupling method of ISPH method and DEM is utilized in our multi-physics simulations, and the coupling method is divided into two methods. One is the “Direct pressure model”. In general, a structure in fluid moves by receiving a pressure from fluid. In this method, the structure, which is modeled as a rigid body dynamics with particles, moves in same way. This coupling method requires that the diameter of fluid particles need to be much smaller than the structure size to calculate a fluid force acting on the structure surface accurately. Therefore, the analysis cost is high to analyze a large scale model such as a breakwater collapse with this method. Then, the other method “Interaction force model” is necessary to simulate fluid-soil interaction. In the interaction force model, a fluid particle can overlap with solid particles, and fluid pressure don’t acts on a solid particle. Instead of pressure, an interaction force acts on each particles, a resistance force on fluid and a drag force on solid. Furthermore, the diameter of fluid particle can be almost the same size with a solid particle. This method can reduce the analysis cost compared than “Direct pressure model”, therefore “Interaction force model” becomes efficient techniques in fluid-soil interaction simulations. The performance and efficiency of our developed multi–physics tsunami disaster simulation tool is given through a couple of verification and validation examples.