用区域分解算法结合蒙特卡罗法求坦克温度场和红外辐射出射度

COMBINING DOMAIN DECOMPOSITION METHOD WITH MONTE CARLO METHOD TO DETERMINE THE TEMPERATURE PROFILE AND INFRARED RADIANCE OF TANK

本文将区域分解算法和蒙特卡罗法相结合，求坦克温度场和红外辐射出射度．采用蒙特卡罗法计算辐射传递系数，可以考虑界面的复杂辐射特性，如：镜反射、各向异性发射、各向异性反射等；可直接考虑界面的复杂几何特性，如:相互遮挡、太阳入射方向上的投影面积等．引入辐射传递系数，分离了计算的难点，使得在时间域（计算步骤）上能把整个问题分解为若干个子问题并行处理、在空间域（计算区域）上将坦克分解为若干个子区域，缩小计算规模，并可使用多个处理器并行计算；同时减轻了蒙特卡罗法编程的难度，缩短了计算时间．

The temperature profile and infrared radiance of a tank were calculated by combiningDomain Decomposition Method wih Monte Carlo method in this paper. When the radiativeenergy transfer coefficient (RETC) was calculated by means of Monte Carlo method, thecomplication of surface radiative characteristic, for example, specular reflecting, anisotropyemitting, anisotropy reflecting, ect., could be taken into account, and the influence of complexshapes, such as geometry barrier and the projecting area of the sun radiation, could also beconsidered directly. By application of the RETC, a complicated calculation has been dividedinto several relatively easy sub-calculations in time-z0ne (computing steps) so that it can besolved in parallel. In space-zone (computing zones), the tank was divided into a number ofdomains, then several computer processors were used simultaneously- At the same time, theMollte Carlo procedures were able to be compiled eaJsily in some extent, and the computingtime was reduced as well.