A Simulation of Landslide-Generated Waves Using a Fully Implicit ISPH

Sammanfattning: Smoothed Particle Hydrodynamics (SPH) is used to study the mechanisms of landslide-generated waves. As the landslide dynamics and the evaluation of impact forces acting on water are most important, landslide is modelled as a highly viscous fluid. Incompressible SPH (ISPH) is used for fluid simulation. Since the landslide is assumed as highly viscous fluid, it needs to satisfy the condition for the viscous term with respect to time step in addition to CFL condition. To use moderate time step, we adopt an ISPH with a fully implicit time integration. The rheology of the soil is characterized by Bingham fluid model. The yield stress is determined by Mohr-Coulomb failure criterion. At the interface of multiphase flows, a conventional SPH framework applies the material properties from neighboring particles for the target particle even though some of them are belonging to a different material. Therefore, we modify the approach to adopt the material properties of the same phase on the target particle. Three validations are made to study the accuracy of the proposed method. It is concluded that the present method is capable of describing the wave generation and propagation phenomena and capturing the soil behavior based on the Mohr-Coulomb parameters.