基于OpenMP的中子输运方程特征线法并行计算研究

特征线法是目前求解反应堆中子输运方程的主要计算方法之一。本文开发了基于OpenMP的中子输运方程特征线法并行计算程序,以提高特征线法的计算效率。OpenMP是共享存储体系结构上的一个并行编程模型,采用Fork-Join并行执行方式,适合于SMP共享内存多处理系统和多核处理器体系结构。通过相关基准题测试验证,表明所开发的程序在有效增殖因数以及相对中子通量(归一化栅元功率)分布等参数上都能取得良好的精度,且使用OpenMP能取得良好的加速效果,使计算时间显著减少。

Research on Parallel Computing of Method of Characteristics of Neutron Transport Equation Based on OpenMP

The method of characteristics (MOC) is one of the main methods for solving reactor neutron transport equation currently. A transport theory code based on the method of characteristics and an OpenMP parallel version of the method of characteristics calculation code were developed. OpenMP is a parallel programming model with shared memory architectures, using Fork-Join parallel execution mode, which is suitable for SMP shared memory multi-processor systems and multi-core processors architecture. The code was verified and validated by different benchmarks. The numerical results demonstrate that the code can give excellent accuracy for both the neutron effective multiplication factor and relative neutron flux (normalized cell power) distribution for neutron transport problem. The use of OpenMP can obtain good acceleration effect, making the calculation time significantly reduced.