A two-dimensional wedge entering water is studied based on two-phase SPH (Smoothed Particle Hydrodynamics) method. We have designed wedges with different deadrise angle to study the cavity evolution and gas flow in the cavity. The liquid phase and gas phase are used by weak compressible model and are all dispersed with SPH particles. A modified coupling boundary method is used here. To remove reflection of pressure wave against the solid boundaries of computational domain, a non-reflection boundary treatment for SPH method is used here. With high spatial resolution of fine particle distribution, deformation of the free surface, evolution of the cavity, gas flow in the cavity and the jets are captured. The simulation results show that, the gas jet attains very high speed when the cavity is getting to be closed and the smaller the angle is, the more the gas is involved.

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