LAUSR

We construct a numerical scheme for a model of two-phase flows. The keystone is the treatment of nonconservative terms using stationary contact discontinuities. The nonconservative terms are absorbed into left-hand and right-hand states of the local stationary contact discontinuity at each grid node. The numerical scheme is built by taking into accounts the states on both sides of local contact discontinuities as supplemented facts of a standard numerical approximation for the conservative part of the system. The scheme is shown to possess interesting properties: it preserves the positivity of the volume fractions in both phases and the positivity of the gas density, it is well-balanced and satisfying the numerical minimum entropy principle in the gas phase.