Multiscale simulation of rarefied gas dynamics via direct intermittent GSIS‑DSMC coupling  

作　　者：Liyan Luo Lei Wu 

机构地区：[1]Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Advances in Aerodynamics》2024年第1期144-159,共16页空气动力学进展(英文)

基　　金：This work is supported by the National Natural Science Foundation of China(No.12172162);the Stable Support Plan(No.80000900019910072348).

摘　　要：The general synthetic iterative scheme(GSIS)has proven its efficacy in modeling rare-fied gas dynamics,where the steady-state solutions are obtained after dozens of itera-tions of the Boltzmann equation,with minimal numerical dissipation even using large spatial cells.In this paper,the fast convergence and asymptotic-preserving properties of the GSIS are harnessed to remove the limitations of the direct simulation Monte Carlo(DSMC)method.The GSIS,which leverages high-order constitutive relations derived from DSMC,is applied intermittently,which not only rapidly steers the DSMC towards steady state,but also eliminates the requirement that the cell size must be smaller than the molecular mean free path.Several numerical tests have been con-ducted to validate the accuracy and efficiency of this hybrid GSIS-DSMC approach.

关 键 词：Direct simulation Monte Carlo General synthetic iterative scheme Fast convergence Asymptotic-preserving 

分 类 号：O17[理学—数学]