Numerical simulation of high-speed water-entry cavity of cone cylinder

Numerical simulation for modeling the cavity formation induced by the high-speed water-entry of a cylinder body with a cone head was performed. Volume of fluid (VOF) model and dynamic mesh were introduced for the multiphase flow and the movement of the body. The velocity attenuation and induced cavity shape were obtained with an initial velocity of 500 m/s. Good agreements were obtained compared with the theoretical results. During the early period of the water entry, the penetrating velocity decreased rapidly because of the high impact load affected on the cone which can be thousand times atmospheric pressure. The maximum cavity diameters of the water-entry cavity get larger when the initial velocity is higher. As the rigid body moves deeper, there is more vapor than air; the multiphase affects the stability of the cavity markedly.