黏性各向异性等离子体对Kelvin-Helmholtz不稳定性的影响  

Effect of viscous anisotropic plasma on Kelvin-Helmholtz instability

作　　者：杨阳[1] 曹玉脉 王向丽[1] 王佳琪 YANG Yang;CAO Yu-mai;WANG Xiang-li;WANG Jia-qi(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,Gansu,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃兰州730070

出　　处：《西北师范大学学报（自然科学版）》2022年第1期51-57,共7页Journal of Northwest Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(11565022)。

摘　　要：基于磁流体力学方程组,采用计算机数值模拟,研究了等离子体中黏性各向异性对Kelvin-Helmholtz不稳定性的影响.分别从密度和磁场分布、涡流结构演化、熵的空间分布和能量转化的角度讨论了黏性各向异性对Kelvin-Helmholtz不稳定性的影响,并且与黏性各项同性的结果进行对比.数值模拟结果表明,在Kelvin-Helmholtz不稳定性演化过程中,黏性各向同性和各向异性等离子体剪切界面密度越低的位置,涡量越大,熵值也越大.相比黏性各向同性,黏性各向异性等离子体对Kelvin-Helmholtz不稳定性有抑制作用.The influence of viscosity anisotropy on Kelvin-Helmholtz instability(KHI)in plasma is studied by means of magnetohydrodynamic equations.The effects of viscosity anisotropy on the KHI were discussed from the perspectives of density and magnetic field distribution,eddy current structure evolution,entropy spatial distribution and energy transformation,respectively,and they were compared with the results of viscosity isotropy.The numerical simulation results show that during the evolution of the KHI,the shear interface of the viscous isotropic and anisotropic plasma have a higher vorticity and entropy at a lower density position.Compared with viscous isotropy,viscous anisotropy plasma has an inhibitory effect on the KHI.

关 键 词：磁流体 开尔文-亥姆霍兹不稳定性 黏性各向异性 

分 类 号：O442[理学—电磁学]