Improved Vertex Weight for Parallelization of DSMC in the Near-continuum Regimes

Linying Li ； Wei Ren ； Bin Zhang

《Journal of Aeronautics, Astronautics and Aviation》 46卷2期 Vol.46 No.2 (2014/06) Pp. 88-94

https://doi.org/10.6125/13-1220-777

並列摘要

In this work, we improve the performance of parallel Direct Simulation Monte Carlo (DSMC) method for near-continuum regimes by adding the local collision number to the traditional vertex weight (simulated molecule number). This work is inspired by the interest that people want to bring the DSMC to the near-continuum regimes and find more flow details beyond the CFD. We analyze the effects of the collision number on the process of DSMC and find its necessity and irreplace ability as the part representation of computing time cost. Two ways to obtain the collision number are considered, and we choose a more stable and accurate one through a designed numerical experiment. With this new method, an apparent decrease of the time cost is achieved for a ramp case because the new vertex weight leads to a better load balance for parallel computation.

並列關鍵字

Vertex weight ； Parallelization ； DSMC ； Load balance ； Near-continuum regime