Analysis of the effect of mass center position on tailslap of supercavitating projectile

The numerical simulation of the cavity morphology in supercavitating projectile tailslap was studied and the rigid body motion parameters and tail-slapping forces variations were comparatively analyzed under different mass centre positions of the supercavitating projectile, based on the theory of homogeneous equilibrium flows, by solving the Reynolds-averaged Navier-Stokes equations (RANS) of mixture fluid, shear stress transport (SST) turbulence transport equations and the mass transport equations between each phase, combined with rigid body motion equations and mesh deformation method. The result shows that the tail-slapping of the supercavitating projectile destroys the symmetry of cavity morphology, the cavity wall of the impact position develops along the direction of the projectile motion; the rotation angle, angular velocity, angular acceleration and tailslap force change periodically, and with the centroid position away from the head of the projectile, the larger the moment of inertia, the greater the period.