Monte Carlo fission matrix acceleration method with adaptive mesh  

作　　者：潘流俊 王瑞宏 江松 

机构地区：[1]Institute of Applied Physics and Computational Mathematics of Beijing

出　　处：《Nuclear Science and Techniques》2015年第5期118-122,F0003,共6页核技术（英文）

基　　金：Supported by National Basic Research Program(973) of China(No.2011CB309705)

摘　　要：In large-scale, loosely coupled systems, Monte Carlo criticality calculation always suffers from slow fission source convergence resulting from the high dominance ratio. The fission matrix acceleration method has shown its potential to accelerate the convergence of the fission source in many numerical simulations. In practice,however, instability of this method may be caused by imbalanced precisions of elements of the fission matrix.Hence, an improved method, in which the space mesh used to compute the fission matrix is defined adaptively based on the fission bank in each cycle, is introduced. The proposed method ensures balanced precisions of elements of the fission matrix, so is more stable than the existing fission matrix method.In large-scale, loosely coupled systems, Monte Carlo criticality calculation always suffers from slow fission source convergence resulting from the high dominance ratio. The fission matrix acceleration method has shown its potential to accelerate the convergence of the fission source in many numerical simulations. In practice,however, instability of this method may be caused by imbalanced precisions of elements of the fission matrix.Hence, an improved method, in which the space mesh used to compute the fission matrix is defined adaptively based on the fission bank in each cycle, is introduced. The proposed method ensures balanced precisions of elements of the fission matrix, so is more stable than the existing fission matrix method.

关 键 词：裂变元素 矩阵元素 蒙特卡罗 自适应网格 加速方法 临界计算 平衡精度 松散耦合 

分 类 号：TL329.2[核科学技术—核技术及应用]