2-D viscous magnetohydrodynamics simulation of plasma armatures with the CE/SE method  

作　　者：LI Xin WENG ChunSheng 

机构地区：[1]National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China

出　　处：《Chinese Science Bulletin》2009年第10期1641-1647,共7页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 10672080)

摘　　要：A possible two-dimensional viscous magnetohydrodynamics (MHD) model is applied to investigating the plasma armature in a railgun. The space-time conservation element and solution element (CE/SE) method for solving the coupled Navier-Stokes equations and Maxwell equations was devised. The distributions of physical parameters of the plasma may thus be evaluated. The results show that extremely high pressure can always be observed ahead of the projectile, and the Lorentz force is the main propulsion. The distribution of temperature is in a good agreement with the results predicted by the law of radiation at the boundaries. Due to convection, the circulation patterns of velocity are evident in both the cases considering inviscid and viscous effect. Furthermore, the velocity and acceleration oscillate over time until a new steady state is achieved. This model efficiently captures the salient features of the physical phenomena, and contributes to further studies of MHD problems in plasma armature.A possible two-dimensional viscous magnetohydrodynamics （MHD） model is applied to investigating the plasma armature in a railgun. The space-time conservation element and solution element （CE/SE） method for solving the coupled Navier-Stokes equations and Maxwell equations was devised. The distributions of physical parameters of the plasma may thus be evaluated. The results show that extremely high pressure can always be observed ahead of the projectile, and the Lorentz force is the main propulsion. The distribution of temperature is in a good agreement with the results predicted by the law of radiation at the boundaries. Due to convection, the circulation patterns of velocity are evident in both the cases considering inviscid and viscous effect. Furthermore, the velocity and acceleration oscillate over time until a new steady state is achieved. This model efficiently captures the salient features of the physical phenomena, and contributes to further studies of MHD problems in plasma armature.

关 键 词：等离子体 三维粘性 流体仿真 电枢 STOKES方程 麦克斯韦方程组 行政 时空守恒元 

分 类 号：O53[理学—等离子体物理] TK730.1[理学—物理]