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 rebalance(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%.