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Stability enhancement of planar transport solution based whole-core calculation employing augmented axial method of characteristics
Annals of Nuclear Energy ( IF 1.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.anucene.2020.107440
Namjae Choi , Han Gyu Joo

Abstract The planar Method of Characteristic (MOC) solution based direct whole core calculation method is stabilized and extended by employing an axial one-dimensional (1D) MOC solver with several augmentations. In order to resolve the inherent instabilities involved in the coarse mesh finite difference formulation employing a nodal simplified P3 (SP3) axial solver, the factors causing negative fluxes are identified and eliminated. The augmentations consist of (1) a subgrid scheme, (2) transverse leakage splitting, and (3) PL scattering and limited transport correction that are selectively applied depending on regional characteristics. Axial domain decomposition is employed for parallel solution of 1D MOC. Various core calculation results demonstrate that the augmented 1D MOC solver considerably enhances stability while retaining comparable accuracy with the SP3 nodal kernel and not causing significant computational overhead.

中文翻译:

基于平面输运解的整体核心计算稳定性增强,采用增强轴向特征法

摘要 通过使用具有多个增强的轴向一维 (1D) MOC 求解器,稳定并扩展了基于平面特征法 (MOC) 解决方案的直接整体核心计算方法。为了解决采用节点简化 P3 (SP3) 轴向求解器的粗网格有限差分公式所涉及的固有不稳定性,确定并消除了导致负通量的因素。增强包括 (1) 子网格方案,(2) 横向泄漏分裂,以及 (3) PL 散射和有限传输校正,根据区域特征选择性应用。轴向域分解用于一维 MOC 的并行求解。
更新日期:2020-08-01
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