KP1-Scheme for Acceleration of Upscatter Iterations over the Neutron Thermalization Region and the Fission Source in Solving a Subcritical Boundary Value Problem

IF 0.7 4区 数学 Q3 MATHEMATICS, APPLIED Computational Mathematics and Mathematical Physics Pub Date : 2024-09-01 DOI:10.1134/s0965542524700672
A. M. Voloshchenko
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Abstract

For the transport equation in three-dimensional \(r,\;\vartheta ,\;z\) geometry, a \(K{{P}_{1}}\)-scheme is constructed for accelerating the convergence of upscatter iterations over the neutron thermalization region and the fission source in solving a subcritical boundary value problem, consistent with the Weighted Diamond Differencing (WDD) scheme, and its generalization to the case of nodal Linear Discontinues (LD) and Linear Best (LB) schemes of the 3rd and 4th order of accuracy in spatial variables is considered. To solve the system for accelerating corrections, an algorithm based on the use of the cyclic splitting method was used, similar to that used earlier when constructing the \(K{{P}_{1}}\)-scheme for accelerating the convergence of inner iterations. An algorithm for determining the energy dependence for accelerating corrections of the \(K{{P}_{1}}\)-scheme for accelerating the convergence of upscatter iterations is considered. The choice of a criterion for the convergence of upscatter iterations is considered, and a criterion integral over up-scattered thermal neutrons for the convergence of upscatter iterations over the region of neutron thermalization is proposed. A modification of the algorithm for the case of three-dimensional \(x,\;y,\;z\) geometry is considered. Numerical examples of using the \(K{{P}_{1}}\)-scheme for accelerating the convergence of upscatter iterations to solve typical problems of neutron transport in three-dimensional geometry are given.

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KP1-在解决亚临界边界值问题时加速中子热化区和裂变源上散射迭代的方案
AbstractFor the transport equation in three-dimensional \(r,\;\vartheta ,\. z\) geometry;z)几何中的输运方程,构建了一种与加权菱形微分(WDD)方案相一致的用于加速中子热化区和裂变源上散射迭代收敛的(K{{P}_{1}}\)方案,并考虑了将其推广到空间变量精度为3阶和4阶的节点线性不连续(LD)和线性最佳(LB)方案的情况。为了求解加速修正系统,使用了一种基于循环分裂法的算法,类似于之前构建 \(K{{P}_{1}}\) 方案以加速内部迭代收敛时使用的算法。研究考虑了一种算法,用于确定加速上散射迭代收敛的\(K{{P}_{1}}\)方案加速修正的能量依赖性。考虑了上散射迭代收敛标准的选择,并提出了中子热化区域上散射热中子迭代收敛的标准积分。考虑了针对三维 \(x,\;y,\;z\) 几何形状的算法修改。给出了使用 \(K{{P}_{1}}\) 方案加速上散射迭代收敛以解决三维几何中子输运典型问题的数值示例。
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来源期刊
Computational Mathematics and Mathematical Physics
Computational Mathematics and Mathematical Physics MATHEMATICS, APPLIED-PHYSICS, MATHEMATICAL
CiteScore
1.50
自引率
14.30%
发文量
125
审稿时长
4-8 weeks
期刊介绍: Computational Mathematics and Mathematical Physics is a monthly journal published in collaboration with the Russian Academy of Sciences. The journal includes reviews and original papers on computational mathematics, computational methods of mathematical physics, informatics, and other mathematical sciences. The journal welcomes reviews and original articles from all countries in the English or Russian language.
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