Development of Rayleigh-Taylor instability (RTI) on the interface between two immiscible fluids is studied by numerical simulations of Navier-Stokes and volume-fraction equations. Comparisons of the computation results with the measurement data for the water-air interface show that implementation of the modified continuous surface force model yields correct behavior for both linear-stability and non-linear RTI evolution stages. Moreover, RTI in the single-phase stably stratified flow above an obstacle (where the internal wave breaking occurs) is compared with the two-fluid case.
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