Effects of operating pressure on high-speed projectile's water-entry flow

In order to research the effects of operating pressure on the projectile's water-entry flow, numerical simulation for process of the high-speed water-entry induced by the cylinder body with a cone head was performed in the way of volume of fluid (VOF) model. Results of the velocity, depth and cavity shape of projectile were achieved and contrasted with the theoretical results obtained by Newton's second law of motion and the literature to verify the correctness of the numerical simulation method. Based on the method, processes with a series of operating pressure were analyzed. Results show that the effects of operating pressure on the phenomena, such as the spatter above the free liquid surface, the cavity surface closure time and the cavitation inside the cavity are great. With the operating pressure being higher, the cavity diameter near the free surface becomes smaller; the cavitation inside is more marked; the time for surface closure happens earlier.