Two-Phase SPH Simulations of Wedge Water Entry

摘要

A two-dimensional wedge entering water is studied based on two-phasernSPH (Smoothed Particle Hydrodynamics) method. We have designedrnwedges with different deadrise angle to study the cavity evolution andrngas flow in the cavity. The liquid phase and gas phase are used by weakrncompressible model and are all dispersed with SPH particles. Arnmodified coupling boundary method is used here. To remove reflectionrnof pressure wave against the solid boundaries of computational domain,rna non-reflection boundary treatment for SPH method is used here. Withrnhigh spatial resolution of fine particle distribution, deformation of thernfree surface, evolution of the cavity, gas flow in the cavity and the jetsrnare captured. The simulation results show that, the gas jet attains veryrnhigh speed when the cavity is getting to be closed and the smaller thernangle is, the more the gas is involved.