Abstract
A parallel 3-D hybrid DSMC-NS method using the unstructured grid topology has been proposed and developed such that near continuum flows or a region consisting of continuum, slip, and free-molecular flows can be simulated efficiently. A continuum breakdown parameter proposed by Wang and Boyd is used in the present work for determining the choice of solver in spatial domain. A hypersonic flow over a 2-D wedge and other test cases are employed to evaluate and validate the present hybrid method. Preliminary results show the simulation data of the present hybrid method is in good agreement with those of the pure DSMC method. In general, computational time using the hybrid method is lower than that using the pure DSMC method. In addition, the region with strong thermal non-equilibrium cannot be precisely identified by the continuum break down parameter proposed by Wang and Boyd. Future study is needed to develop an appropriate method to identify the thermal non-equilibrium region.
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