Numerical Simulation of Supercavitation

Abstract

Numerical simulation of supercavitaton has been carried out for high speed underwater projectile with two different projectile models. MUSCL scheme is implemented in the simulation. With contrast of two one-fluid cavitation models, isentropic model is proved to be more consistent than other models. To validate the isentropic model, two-dimensional underwater cavitating flow is tested. Two different underwater projectile models are simulated, one is a forward-facing step, and the other is a hemisphere head projectile. Single phase flow is firstly simulated to check the boundary conditions. To specially treat the corner point of the step which is a singular point, two methods are employed which are entropy and enthalpy corrections and the restriction of pressure at the corner point. The results showed the restriction of pressure at the corner point when there is phase change there is reasonable and physical according to the experimental results. To treat the structure interface of a hemisphere head projectile, level set technique is extensively applied. Isentropic model is implemented in both of two models at high velocity flow to simulate the attached supercavitation.