二维三温辐射(磁)流体力学拉氏计算中的人工粘性分裂技术  

Artificial Viscosity Splitting Strategy in Lagrangian Algorithm for Two-dimensional Three-temperature Radiation Magnetohydrodynamics

作　　者：戴自换[1] 邬吉明[1] 丁宁[1] 

机构地区：[1]北京应用物理与计算数学研究所磁驱动聚变研究中心,北京100088

出　　处：《计算物理》2015年第4期379-385,共7页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(91330107;11271053);国防基础科研计划(B1520133015)资助项目

摘　　要：针对使用边粘性和张量粘性进行二维三温辐射(磁)流体力学拉氏计算时激波处离子温度出现非物理尖峰的问题,提出一种人工粘性分裂技术,将人工粘性耗散能量按照电子压和离子压的比分成两部分,并分别加在电子内能和离子内能上.在二维三温辐射磁流体力学程序MARED上实现该技术,并对Z-pinch的内爆动力学过程进行数值模拟.消除了模拟结果中激波处离子温度的尖峰.An artificial viscosity splitting strategy for Lagrangian algorithm of two-dimensional three-temperature radiation magnetohydrodynamics is proposed to solves unphysical pinnacle problem in ion temperature around shock wave as edge viscosity and tensor viscosity are used. The strategy divides kinetic ernergy dissipated by artificial viscosity between electron interior energy and ion interior energy according to ratio of electron pressure and ion pressure. It is realized in two-dimensional three-temperature radiation magnetohydrodynamics code MARED and is used to simulate imploding process of Z-pinch. Unphysical pinnacle in ion temperature around shock wave is removed.

关 键 词：二维三温辐射磁流体力学 边粘性 张量粘性 人工粘性分裂技术 

分 类 号：O241[理学—计算数学]