An improved parallelized hybrid DSMC-NS algorithm

Y. Y. Lian*, K. C. Tseng, Y. S. Chen, M. Z. Wu, Jong-Shinn Wu, Gary Cheng

*Corresponding author for this work

Research output: Contribution to journalConference article

2 Scopus citations

Abstract

An improved parallelized hybrid DSMC-NS algorithm presented and verified. In previous work [1], it showed the slow convergence of coupling between two numerical solvers if the normal velocities across the breakdown interfaces are very low. By detailed kinetic velocity sampling study from the pure DSMC simulation of a twodimensional supersonic nitrogen flow (M=4) past a 25° finite wedge, we have found most of boundary layer region is in nearly thermal equilibrium, even with very high continuum breakdown Kn max [10]. Thus, a new continuum breakdown parameter based on pressure gradient, pressure and local mean free path, which can be used to effectively "exclude" the "false" breakdown region like the boundary layer, is proposed in this paper. Results show that the improved algorithm can greatly reduce the computational cost while maintaining essentially the same accuracy.

Original languageEnglish
Pages (from-to)341-346
Number of pages6
JournalAIP Conference Proceedings
Volume1084
DOIs
StatePublished - 13 Apr 2009
Event26th International Symposium on Rarefied Gas Dynamics, RGD26 - Kyoto, Japan
Duration: 20 Jul 200825 Jul 2008

Keywords

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

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    Lian, Y. Y., Tseng, K. C., Chen, Y. S., Wu, M. Z., Wu, J-S., & Cheng, G. (2009). An improved parallelized hybrid DSMC-NS algorithm. AIP Conference Proceedings, 1084, 341-346. https://doi.org/10.1063/1.3076499