An improved parallelized hybrid DSMC-NS algorithm

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

doi:10.1063/1.3076499

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

Department of Mechanical Engineering

Research output: Contribution to journal › Conference article › peer-review

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 language	American English
Pages (from-to)	341-346
Number of pages	6
Journal	AIP Conference Proceedings
Volume	1084
DOIs	https://doi.org/10.1063/1.3076499
State	Published - 2009
Event	26th International Symposium on Rarefied Gas Dynamics, RGD26 - Kyoto, Japan Duration: 20 Jul 2008 → 25 Jul 2008

Keywords

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

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10.1063/1.3076499

Cite this

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author = "Lian, {Y. Y.} and Tseng, {K. C.} and Chen, {Y. S.} and Wu, {M. Z.} and Jong-Shinn Wu and Gary Cheng",

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journal = "AIP Conference Proceedings",

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T1 - An improved parallelized hybrid DSMC-NS algorithm

AU - Lian, Y. Y.

AU - Tseng, K. C.

AU - Chen, Y. S.

AU - Wu, M. Z.

AU - Wu, Jong-Shinn

AU - Cheng, Gary

PY - 2009

Y1 - 2009

N2 - 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.

AB - 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.

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An improved parallelized hybrid DSMC-NS algorithm

Abstract

Keywords

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