numerical method for simulating rarefied two phase flow

A numerical simulation approach is presented to simulate rarefied two phase flow by applying two-way coupling technical in DSMC method. The interaction between rarefied gas and solid particles is dealt with decoupled approximation to compute momentum and energy exchange between phases. Results of simulation examples validate the methods and the models by the comparison of the present results with that of typical confirmed results from references, and indicate that it can ensure momentum and energy conservation between phases even in case of large sample number. A two-phase plume flow field from solid rocket engine is simulated using this present method. Away from the engine nozzle, gas and solid particles have a greater impact caused by temperature drop and increases of the speed of particles. The particles temperature away from the nozzle exit tends to be balanced. Simulation shows that the particle size and gas rarefaction would affect the interaction evidently.