DIRECT NUMERICAL TEST OF THE B-G-K MODEL EQUATION BY THE DSMC METHOD

作     者：沈青 易志强 

作者机构：Institute of Mechanics Chinese Academy of Sciences Beijing China 100080 

出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)

年 卷 期：2000年第16卷第2期

页      面：133-140页

核心收录：

学科分类：07[理学] 070104[理学-应用数学] 0701[理学-数学] 

基　　金：The project supported by the National Natural Science Foundation of China (19772059  19889209) 

主　　题：BGK model equation DSMC method rarefied gas flow Rayleigh problem 

摘      要：In the present paper the rarefied gas how caused by the sudden change of the wall temperature and the Rayleigh problem are simulated by the DSMC method which has been validated by experiments both in global flour field and velocity distribution function level. The comparison of the simulated results with the accurate numerical solutions of the B-G-K model equation shows that near equilibrium the BG-K equation with corrected collision frequency can give accurate result but as farther away from equilibrium the B-G-K equation is not accurate. This is for the first time that the error caused by the B-G-K model equation has been revealed.