Improved parallelized hybrid DSMC-NS method

Yu Yung Lian, Yen Sen Chen, K. C. Tseng, Jong-Shinn Wu*, Bill Wu, Luke Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


In this paper, an improved parallelized hybrid DSMC-NS (Navier-Stokes method) algorithm, as compared to the previous work [1], is presented. A detailed kinetic velocity sampling study is conducted with a two-dimensional supersonic flow (M=4) past a 25° finite wedge. It shows most of the boundary layer region is in nearly thermal equilibrium, even with very high continuum breakdown parameter based on velocity, velocity gradient and local mean free path. A new continuum breakdown parameter based on pressure is designed to effectively " exclude" the " false" breakdown region such as the boundary layer. An improved hybrid DSMC-NS algorithm is verified using the same wedge flow case. Results show that the improved algorithm can greatly reduce the computational cost while maintaining essentially the same accuracy. A hypersonic flow (M=12) past a square cylinder is also employed to exhibit the capability of the improved hybrid DSMC-NS method.

Original languageEnglish
Pages (from-to)254-260
Number of pages7
JournalComputers and Fluids
Issue number1
StatePublished - Jun 2011


  • Boundary layer
  • Continuum breakdown parameter
  • Direct simulation Monte Carlo (DSMC)
  • Hybrid DSMC-NS algorithm


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