Utilization of Region-wise Even-Parity Discontinuity Factor to Reduce Discretization Error of MOC
Utilization of Region-wise Even-Parity Discontinuity Factor to Reduce Discretization Error of MOC
复制标题
利用区域偶奇偶校验不连续因子减少 MOC 离散化误差
DOI：
10.1080/00295639.2018.1516961
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
T. Endo
中科院分区：
文献类型：
--
作者：
A. Yamamoto;A. Giho;T. Endo
为了减小特征线法在粗计算条件下的角向和空间离散误差，通过仅使用区域标量通量的迭代过程来计算输运计算的区域偶宇称不连续因子（EPDF），没有奇宇称角通量、部分电流或区域边界处的净电流。区域EPDF的评价在一个单一的组件几何反射边界条件。评估EPDF应用于2 × 2色组组件和核心配置，并与传统的超均匀化（SPH）方法的性能进行了比较。计算结果表明：（1）在迭代过程中没有发现收敛问题;（2）分区EPDF的性能优于传统的SPH方法;（3）对EPDF进行归一化处理是必要的，以考虑不同类型燃料组件之间不同的表面标量通量水平。
To reduce angular and spatial discretization error of the method of characteristics with a coarse calculation condition, the regionwise even-parity discontinuity factor (EPDF) for transport calculations is evaluated through an iterative procedure using only the regionwise scalar flux, i.e., without the odd-parity angular flux, the partial current, or the net current at the region boundary. The regionwise EPDF is evaluated in a single-assembly geometry with the reflective boundary condition. The evaluated EPDF is applied to a 2 × 2 colorset assembly and core configurations, and the performance is compared to that of the conventional superhomogenization (SPH) method. The calculation results indicate that (1) no convergence issue is observed during the iteration process to estimate the EPDF, (2) the performance of the regionwise EPDF is better than that of the conventional SPH method, and (3) the normalization of the EPDF is necessary to incorporate different surface scalar flux levels among different types of fuel assemblies.