数值散射是辐射传递方程近似算法中最常见的离散误差.本文主要讨论空间差分格式对有限体积法数值散射的影响.构造激光平行及倾斜入射的物理模型,验证和比较阶梯格式、中心差分格式及指数格式下温度场的计算精度及数值散射特性.计算结果表明,在激光平行入射与倾斜入射两种情况下,阶梯格式引起的的数值散射比菱形格式及指数格式要多,但其计算精度高于菱形及指数格式.不同激光入射条件下,各种差分格式表现出的数值散射分布有明显的差异.
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