Numerical simulation of the influence of atmospheric pressure on water-cavity formed by cylinder with vertical water-entry

Abstract:

The dynamics of the water-entry cavity created by vertical water entry of cylinder with 1500 cone nose is simulated based on the Reynolds-Averaged-Navier-Stokes ( RANS) equations, in which the Finite-Vol- ume Method is used in the discretization of the control equations, and the Volume of Fluid Method with the sources of mass transfer due to the natural cavitation is adopted for the multiphase flows of water-entry cavity. The dynamic mesh method is used to control the constant speed of the cylinder. The results show that the non- dimensional time of cavity closure is a function of the atmospheric pressure and the atmospheric density. The cavity closure types depend on the atmospheric pressure and the water-entry velocity greatly. The non-dimen- sional diameter of the cavity created by the cylinder with cone nose at the time of closure is a function of the atmospheric pressure