三维中子输运分流再平衡加速及其并行算法  

Parallel partial current rebalance algorithm for neutron transport simulation

作　　者：程汤培[1,2] 张广春[1,2] 魏军侠[1] 邓力[1] 

机构地区：[1]北京应用物理与计算数学研究所,北京100088 [2]中物院高性能数值模拟软件中心,北京100088

出　　处：《强激光与粒子束》2017年第9期146-151,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61602047;91430218);能源局06专项资助项目(2015ZX06002008);国防科工局国防基础科研计划项目(C1520110002)

摘　　要：为加速基于离散纵标方法(SN)的中子输运计算,针对群内迭代进行研究并实现了分流再平衡(PCR)算法及基于区域分解的并行,并在加速方程求解时进一步耦合了算术多重网格算法。并行PCR算法已集成至JSNT软件,并针对临界和外源计算典型算例验证了算法的正确性和有效性。74亿自由度的国内某商业压水堆压力容器屏蔽计算中,JSNT迭代次数减少至原来的1/3以下,总体计算时间减少至原来的1/2以下,1024核并行效率达42.8%。To accelerate neutron transport calculation using discrete ordinates method, this paper presents a parallel partial current rehalance（PCR） algorithm based on domain decomposition, which is coupled with algebraic multigrid solver. The parallel PCR algorithm has been integrated in JSNT software and its correctness and effectiveness have been verified by typical critical and extraneous source calculation. In the pressure vessel shielding calculation of the pressurized water reactor in China, the iteration number and total computing time are decreased by more than 3 and 2 times respectively, the parallel efficiency on 1024 cores is 42.8%.

关 键 词：源迭代加速 分流再平衡算法 并行算法 离散纵标 屏蔽计算 

分 类 号：TL329[核科学技术—核技术及应用] TL328