Capture of Air Cushion Effects in a Wedge Water Entry SPH Simulation

摘要

A wide range of free surface impact studies can be achieved without taking air effects into account. But depending on the shape and dimensions of the solid involved in the impact, these effects may have some non negligible influences on the impact features at beginning of the entry, as it would be observed in the occurrence of air-cushioning. A two-dimensional numerical simulation of a body in free motion with coupled interactions with air and water is presented in this paper, using Smoothed Particles Hydrodynamics (SPH) method. The multi-phase flow study presented here deals with fluids having a high density difference, implying a need for some special care on the SPH formulation to adopt. Successive effects of air and water on the body are emphasized, and numerical results are validated through some comparisons with experimental data, showing good agreements.