標題: Improved parallelized hybrid DSMC-NS method
作者: Lian, Yu-Yung
Chen, Yen-Sen
Tseng, K. -C.
Wu, J. -S.
Wu, Bill
Yang, Luke
機械工程學系
Department of Mechanical Engineering
關鍵字: Continuum breakdown parameter;Direct simulation Monte Carlo (DSMC);Hybrid DSMC-NS algorithm;Boundary layer
公開日期: 1-Jun-2011
摘要: 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(infinity) = 4) past a 25 degrees 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(infinity) = 12) past a square cylinder is also employed to exhibit the capability of the improved hybrid DSMC-NS method. (C) 2010 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.compfluid.2010.12.015
http://hdl.handle.net/11536/22879
ISSN: 0045-7930
DOI: 10.1016/j.compfluid.2010.12.015
期刊: COMPUTERS & FLUIDS
Volume: 45
Issue: 1
起始頁: 254
結束頁: 260
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