The simulation of cavitating flows induced by underwater shock and free surface interaction

An underwater explosion near a free surface constitutes an explosive gas-water-air system with a shock and free surface interaction and the presence of bulk cavitation region. This paper applies a simplified modified ghost fluid method [T. G. Liu, et al., Comm. Comput. Phys. 1 (2006) 898] to simulate the explosive gas-water and water-air interfaces and an isentropic one-fluid cavitation model [TG. Liu, et al., J. Comput. Phys. 201 (2004) 80] to describe and capture the unsteady cavitation just below the free surface. It is found that the proposed ghost fluid method can accurately simulate the gas-water/water-air compressible flows with the wave interaction at the interfaces and the deformation of the free surface. The isentropic one-fluid cavitation model, on the other hand, is capable of simulating the dynamic creation and evolution of the bulk cavitation below the free surface. (c) 2006 IMACS. Published by Elsevier B.V. All rights reserved.