Abstract
When underwater vehicle moves at high speed, the local cavity is formed due to the drop of pressure. While the vehicle crossing the water free surface, the local cavity will collapse, and the water around the cavity will impact the hull of vehicle severely, causing dramatically change of pressure and posing a great challenge to the vehicle structure. Considering the interaction of water, water vapor and air, the simulation of the cavity collapse procedure during the vehicle crossing water free surface has been studied by a viscous flow solver with homogeneous multiphase flow model and modified Rayleigh-Plesset equations. And the structure response under the fluid load has been also calculated, considering the interaction between fluid and structure.
