標題: An Improved Parallelized Hybrid DSMC-NS Algorithm
作者: Lian, Y-Y.
Tseng, K-C.
Chen, Y. -S.
Wu, M. -Z.
Wu, J. -S.
Cheng, Gary
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
公開日期: 2009
摘要: An improved parallelized hybrid DSMC-NS algorithm presented and verified. In previous work [11, 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 two-dimensional supersonic nitrogen flow (M-infinity=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.
URI: http://hdl.handle.net/11536/135017
ISBN: 978-0-7354-0615-5
ISSN: 0094-243X
期刊: RAREFIED GAS DYNAMICS
Volume: 1084
起始頁: 341
結束頁: +
Appears in Collections:Conferences Paper