蒙特卡洛模拟漫辐射时两种确定表面发射方向方法的比较

Determination of Emissive Direction from a Diffusing Surface in Monte Carlo Simulations

介绍一种有效的确定能束发射方向的方法———切球法.分析传统方法和切球法确定发射方向的原理及实施过程,说明切球法更为方便.采用2种方法对一简单的几何模型的角系数进行蒙特卡洛计算,所得结果与文献中积分结果进行比较,说明了切球法的可行性,计算精度能满足工程要求.同时对2种方法的计算耗时进行比较,切球法可以节省计算时间.将切球法应用到复杂系统中其优越性将会得到更加充分体现.

We introduce an effective method to determine the emissive direction of energy bundles from a diffusing surface, which is called a tangent sphere method. The principle and implement process of the conventional method, and the tangent sphere method are analysed, h shows that the tangent sphere method is more convenient. A Monte Carlo simulation is applied to a simple model. A comparison of numerical results and integral results shows that the tangent sphere method is feasible and its precision meets engineering reqnirment. A comparison of computing shows that the computational speed of the tangent sphere method is superior to that of the conventional method.