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研究了二维热化学非平衡流动非结构网格DSMC方法实现的过程。提出了一种新型的高效搜索算法,该算法不仅可以跟踪模拟分子在网格之间的迁移,而且在搜索过程中可以准确判别分子与物面是否相互作用,避免了原有算法中分子表面反射非确定论判据。为加快流场的时间发展历程,设计了适合DSMC方法的动态局部时间步长技术,使其可以应用到定常和非定常流场的计算。利用Fortran90的动态分配内存技术编制了计算程序。最后对过渡流域高超声速圆柱绕流进行了数值试验,计算结果初步验证了该算法的可行性。
The realization of two-dimensional thermochemical non-equilibrium flow unstructured grid DSMC method is studied. A new efficient search algorithm is proposed, which can not only track the migration of analog molecules between grids, but also accurately identify whether the molecules interact with the object surface during the search process and avoid the molecular surface reflection Non-deterministic criterion. In order to speed up the development of the flow field, a dynamic local time-step technique suitable for the DSMC method is designed so that it can be applied to the calculation of steady and unsteady flow fields. Using Fortran90 dynamic allocation of memory technology compiled a calculation program. Finally, the numerical experiment of the supersonic circular flow in the transitional watershed is carried out. The calculation results preliminarily verify the feasibility of the algorithm.