Two-level virtual mesh refinement algorithm in a parallelized DSMC Code using unstructured grids

C.C. Su, K.C. Tseng, J.S. Wu, H.M. Cave, M.C. Jermy, Y.Y. Lian
2011 Computers & Fluids  
In this paper, a virtual mesh refinement (VMR) algorithm for unstructured grids is developed and verified in the parallelized direct simulation Monte Carlo code (PDSC). This algorithm is a two-level virtual mesh refinement, in which the background mesh is refined based on an initial DSMC simulation. The refined cells are arranged in a way similar to the structured grid, which makes the particle tracing on them very efficient, unlike unstructured grids. These virtual cells are used for particle
more » ... ollision and sampling. Only those refined cells which contain the centroid of background cells are used for outputting macroscopic data. Two hypersonic flows with purely quadrilateral and mixed triangular-quadrilateral mesh were used to verify this new mesh-refining algorithm. Results show that the case using VMR can faithfully reproduce the benchmark case with a much reduced computational time.
doi:10.1016/j.compfluid.2011.04.002 fatcat:bizp7kegv5ctvgkxd2jnguhrbq