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A parallel first-order spherical harmonics (P-1) matrix-free method for radiative transport

机译:辐射传输的并行一阶球谐(P-1)无矩阵方法

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Radiative transfer in participating media is modeled using a first-order spherical harmonics (P-1), or its degenerate form, diffusion. The equations are discretized on an unstructured grid. The method uses a matrix-free algorithm employing an iterative solver from the Preconditioned Conjugate Gradient (PCG) solver package developed by Joubert and Carey [1]. The algorithm couples radiation transport and conduction, by casting them into a Picard iteration. Compared are solutions for two participating media problems indicating the method to be first-order accurate in time. Parallel scaling of the matrix-free method with use of in-situ preconditioners, symmetric successive overrelaxation (SSOR) and block Jacobi, are reported.
机译:使用一阶球谐函数(P-1)或简并形式的扩散来模拟参与介质中的辐射传递。方程在非结构化网格上离散化。该方法使用无矩阵算法,该算法采用Joubert和Carey [1]开发的预条件共轭梯度(PCG)求解程序包中的迭代求解器。该算法通过将辐射传输和传导转换为Picard迭代来进行耦合。比较了两个参与媒体问题的解决方案,这些问题表明该方法在时间上是一阶准确的。报告了使用原位预处理器,对称连续超松弛(SSOR)和块Jacobi进行无矩阵方法的并行缩放。

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