由强激光产生的烧蚀等离子体随时间演化的数值模拟  

Numerical Simulation on Evolution of Ablation Plasma Generated by Strong Laser

作　　者：童慧峰[1] 唐志平[2] 张凌[2] 

机构地区：[1]中国工程物理研究院流体物理研究所,四川绵阳621900 [2]中国科学技术大学力学和机械工程系中科院材料力学行为与设计重点实验室,安徽合肥230026

出　　处：《计算物理》2007年第6期667-672,共6页Chinese Journal of Computational Physics

基　　金：中科院(42201.02.02)资助项目

摘　　要：采用单流体模型描述由强激光产生的烧蚀等离子体,并用具有五阶精度的广义Godunov差分格式——加权本质无振荡格式对该模型进行离散化,考虑激光与等离子体相互作用和能量耦合,数值模拟强激光与固体靶相互作用时产生的烧蚀等离子体随时间演化的物理过程,给出数值模拟结果,并对其进行分析和讨论.数值模拟结果表明,激光能量在靶面等离子体中被强烈吸收,激光支持LSD(Laser Supported Detonation)波速度约为理想LSD波速度的一半.A general Godunov finite difference scheme--WENO（Weighted Essentially Non-Oscillatory） scheme with fifth-order accuracy is used to calculate 2-dimensional axis symmetrical laser-supported plasma flow field under laser ablated solid target, considering ionization degree of plasma and the interaction and coupling between laser beam and plasma. Evolution of the ablation plasma due to the interaction between laser and solid target is obtained. The simulation shows that the laser beam is strong absorbed by plasma on target surface, and the velocity of LSD（Laser Supported Detonation） wave is half of the ideal LSD derived with C-J detonation theory.

关 键 词：有限差分 数值模拟 激光支持等离子体 

分 类 号：O381[理学—流体力学] O432.12[理学—力学]