Abstract:In this paper,the numerical method for the two-pressure and two-velocity seven-equation model presented by Saurel and Abgrall is improved and applied to numerical simulation of compressible multicomponent flows.Based on the operator splitting method given by Saurel et al.and the idea proposed by Abgrall that "for a two phase system,uniformity in velocity and pressure at t=0 will be kept on the same variable during its temporal evolution",discretization for the non-conservative terms and upwind scheme for the volume fraction evolution equation are derived in terms of the underlying HLLC approximate Riemann solver used for the conservation equations.Moreover,the third-order TVD Runge-Kutta method is implemented in conjunction with the operator splitting to obtain a robust procedure by reordering the sequence of operators.Numerical tests with several 1d and 2d compressible gas-liquid multicomponent flow problems with high density and high pressure ratios demonstrate that the present method is more accurate and robust than previous methods.