激光辐照热效应混合模拟方法

Hybrid simulation method for thermal effects of laser irradiation

针对激光辐照热效应模拟中传统的有限元法对复杂几何结构和多次散射光处理能力较差的问题,在三维多物理场流-固耦合问题并行计算程序CFS中实现射线追踪-有限元模拟方法.与传统有限元法相比,该方法在有限元网格划分的基础上,采用射线追踪技术将各网格单元所吸收的辐照激光能量加入方程求解系统.对2A12硬铝材料腔体结构件激光辐照热效应的计算表明,该方法提高程序对计算模型几何结构复杂性的适应能力,解决多次散射光存在时传统方法难以准确描述辐照激光能量在求解区域中分布的问题,从而有效扩展CFS程序的使用范围.

As to the problem that the handling capacity on complex geometrical structure and repetitious scattering rays is poor in the simulation on thermal effects of laser irradiation using traditional finite element method, ray tracing vs finite element simulation method is implemented in the parallel computing program CFS which is for solving fluid-solid coupling problem in 3D multi-physical fields. Compared with the traditional finite element method, based on the finite element meshing and ray tracing technology, the system is solved by adding laser irradiation energy absorbed by elements in equations. The calculation of thermal effects of laser irradiation on cavity structure which is made of hard Aluminum 2A12 shows that the method improves the capacity of computational model program in adopting for geometrical structure complexity, and also can solve the problem that it is difficult to describe the laser irradiation energy distribution accurately in the solving area using traditional method while repetitious scattering rays exist. Then the use of program CFS can be extended efficiently.