Numerical investigations on the oblique water entry of high-speed projectiles

摘要

In this paper, we investigate the main characteristics of oblique water entry of high-speed cylindrical projectiles, which involves multiphase flows due to cavitation. Numerical simulations are performed by solving Reynolds-averaged Navier–Stokes (RANS) equations coupled with 6-degree of freedom (DOF) rigid-body motion equations. The model is validated firstly by comparing with previous results. Then the studies of different entry conditions are performed, and we find that the velocity attenuation during the entry process is mainly affected by the projectile geometric parameters such as its head shape and length, rather than the entry angles and velocities. The drag coefficient is also dominated by the head shape. Furthermore, the time of surface closure of cavity is linear with the entry velocity of the projectile.