A unified framework for particulate two-phase flow is presented with a wide range of solid particle concentration from dilute to dense limit. The simulated by two coupled solvers, that is, the gas-kinetic scheme (GKS) gas phase and wave–particle method (UGKWP) phase. GKS second-order Navier–Stokes solver. UGKWP multiscale all regimes. wave decomposition in depends on cell's Knudsen number (Kn)....