近空间稀薄与连续流混合网格耦合方法研究

continue/rarefied coupling algorithm based on the structured-unstructured grid has been presented for simulating the continue/rarefied flow field. The whole flow field is divided into rarefied zone and continue zone, unstructured grid and structured grid are used in each other, and the DSMC and CFD methods are used to compute the rarefied/continue flow field. The Chapman-Enskog distribution and statistical average methods are used to transform the information between different zones of the flow field, and then the transition zone is used to transfer these information. This algorithm not only can simulate the continue-discontinue flow field in the rarefied gas zone, but also can make the structured grid and the unstructured grid take their own advantages when computing the flow field with complex shape. Get the solution of the hybrid algorithm, and compare it with the solution got by the DSMC and CFD methods, then prove the correctness of this hybrid algorithm in simulating the rarefied gas zone.