• 中国计算机学会会刊
  • 中国科技核心期刊
  • 中文核心期刊

Computer Engineering & Science

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Parallel  optimization for coupling N-S/DSMC
algorithm of near-continuum transitional flow region 
on 100P domestic supercomputing system
 

XU Jinxiu1,LI Zhonghua2,SUN Jun1,LI Zhihui3,ZHENG Yan1   

  1. (1.Jiangnan Institute of Computing Technology,Wuxi 214083;
    (2.China Aerodynamics Research and Development Center,Mianyang 621000;
    (3.National Laboratory for Computational Fluid Dynamics,Beijing 100191,China)
  • Received:2018-10-17 Revised:2018-12-20 Online:2019-04-25 Published:2019-04-25

Abstract:

The numerical simulation for near-continuum transitional flow region is a very challenging field of aerodynamics. We first introduce the NavierStokes (NS) resolver and the direct simulation Monte Carlo (DSMC) method, based on which we propose an N-S/DSMC coupling numerical algorithm by developing the modular particle-continuum (MPC) technique. This extends the application range of the DSMC method and the N-S method to the transitional flow region. Then, we explain fully the multi-level parallel optimization techniques of the coupling algorithm  on the 100P supercomputers in the National Supercomputing Center in Wuxi, and the many-core parallelization is realized for the first time. The tests show that the process-level optimization can obtain super-linear speedup. Though the many-core level optimization does not obtain the expected effect due to the features of the original algorithm and the computer architecture, we make in-depth discussion and analysis. Our research and analysis provide a reference for many-core parallelization of the coupling N-S/DSMC algorithm, and provide an effective approach for the numerical simulations of hypersonic aerodynamics.
 

Key words: hypersonic transitional flow, modular particle-continuum (MPC) technique, coupling algorithm, OpenACC