arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2010.04559math.NAcs.NA
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前向峰散射辐射输运方程的角向多重网格预条件子

An Angular Multigrid Preconditioner for the Radiation Transport Equation with Forward-Peaked Scatter

Danny Lathouwers, Zoltan Perko

摘要:

在之前的一篇论文(Lathouwers和Perkó,2019)中,我们为玻尔兹曼输运方程开发了一个有效的角度多重网格预处理器,该方程具有由福克-普朗克近似建模的前向峰值散射。离散是基于一个完全不连续的伽辽金有限元计划的空间和角度。该方案被发现是非常有效的各向同性和各向异性细化角网格。本文的目的是将该方法推广到非Fokker-Planck模型,通过广义Legendre展开描述前向散射。作为平滑的标准源迭代使用,而粗角网格上的解决方案是通过一个特殊的扫描程序,能够解决这个问题,高度各向异性散射,只使用少量的迭代。通过降低多重网格预处理器中的散射阶数,得到了一种有效的格式。一组测试问题,以说明该方法的有效性,即在较少的迭代比单网格的情况下,更重要的是减少计算工作量。

英文摘要:

In a previous paper (Lathouwers and Perkó, 2019) we have developed an efficient angular multigrid preconditioner for the Boltzmann transport equation with forward-peaked scatter modeled by the Fokker-Planck approximation. The discretization was based on a completely discontinuous Galerkin finite element scheme both for space and angle. The scheme was found to be highly effective on isotropically and anisotropically refined angular meshes. The purpose of this paper is to extend the method to non-Fokker-Planck models describing the forward scatter by general Legendre expansions. As smoother the standard source iteration is used whereas solution on the coarsest angular mesh is effected by a special sweep procedure that is able to solve this problem with highly anisotropic scatter using only a small number of iterations. An efficient scheme is obtained by lowering the scatter order in the multigrid preconditioner. A set of test problems is presented to illustrate the effectivity of the method, i.e. in less iterations than the single-mesh case and more importantly with reduced computational effort.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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