激光辐照柱体铝靶的三维光滑粒子流体动力学仿真

摘要

在现有光滑粒子流体动力学方法基础上,提出了结合差分方法处理激光辐照边界条件的方法,并利用此方法自编程序模拟计算了功率密度为5.0×109 W/cm2的强连续激光辐照铝靶时的热-力学效应,准确给出了与激光作用的边界粒子的分布和飞散情况,同时给出了不同时刻靶体的温度场,得到了温度分布规律,并对结果进行了分析.%Smoothed particle hydrodynamics (SPH) is a typical meshless particle method. However, the heat flux boundary of laser radiation in SPH method is a big problem which dues to the difficulty of determining particles which receive the laser's energy in a time-step. In this paper, the problem is solved by the difference method, and a three-dimensional program LAMP (laser ablation material program) is compiled with FORTRAN language to numerical simulate the interaction between 5.0×109 W/cm2 continuous wave laser and a columnar aluminum target. The boundary particles which receive the laser's energy are accurately determined, and temperature distributions at different time in the target are obtained.