激光支持等离子体流场的2维动态数值模拟  

2-D dynamical simulation of laser-supported plasma flow field

作　　者：童慧峰[1] 唐志平[1] 张凌[1] 

机构地区：[1]中国科学技术大学力学和机械工程系中国科学院材料力学行为与设计重点实验室

出　　处：《强激光与粒子束》2006年第12期1996-2000,共5页High Power Laser and Particle Beams

基　　金：中国科学院资助课题(42201.02.02)

摘　　要：采用高温气体(等离子体)电离度的一种近似计算方法,以及具有五阶精度的广义Godunov差分格式-加权本质无振荡格式,给出了高温气体状态方程的简便描述,并考虑激光与等离子体的相互作用和能量耦合模拟了强激光与固体靶相互作用时激光支持靶面等离子体流场的动态物理过程,并同理论模型结果进行了比较。结果表明:不考虑2维膨胀效应的理论模型结果比2维数值计算结果偏大,但两者只有接近一倍的差距,并无数量级的差别。考虑了膨胀效应的2维数值计算结果是可信的。A general Godunov finite difference schemes-WENO（weighted essentially non-oscillatory）Schemes which have fifth-order accuracy is used to make a numerical calculation of 2-dimensional axis symmetrical laser-supported plasma flow field under laser ablated solid target. The models of the calculation of ionization degree of plasma and the interaction between laser beam and plasma and the simplified EOS（equation of state） of plasma are considered in the simulation. Variation of plasma field parameters during and after laser interaction is also obtained. The comparison of simulation results and theoretical model shows that the results of theoretical model which has no consideration of 2-D expansion effect greater than the results of 2-D simulation, and there is no order difference in magnitude. The results of simulation are creditable.

关 键 词：有限差分 数值模拟 激光支持等离子体 膨胀效应 

分 类 号：O439[机械工程—光学工程] TN249[理学—光学]