一种全堆芯精确到每个通道的子通道并行模拟方法

为实现全堆芯精确到每个通道的并行子通道模拟，本文提出一种基于子通道的并行任务划分和进程映射方法，可对全堆芯或单个组件进行计算任务划分，计算任务和进程的映射可灵活进行。该方法可根据计算机（群）的核数确定恰当的全堆芯子通道的任务划分方式，从而使全堆芯热工水力模拟可在单机、小型集群到超级计算机等不同环境运行。在天河二号超级计算机上进行全堆芯157组件、精确到每个真实流道、轴向划分为125层的稳态模拟，可使用4～6 280核实现。使用4核时需约22 h，使用6 280核时需470 s。引入混合编程实现方式后，使用6 280核完成模拟需397 s。

Parallel Strategy for Full-core and Real-channel-resolved Thermal-hydraulic Subchannel Simulation

In order to implement full-core and real-channel-resolved parallel subchannel simulations, a subchannel-based parallel partitioning and mapping method was presented. The method is able to partition either a full-core or a single assembly, and it maps the computation tasks and processes flexibly. The method chooses the appropriate partitioning method according to the core number of the computers/clusters used, which enables the full-core thermal-hydraulic simulation to be carried out on various computing environments ranging from personal computers to supercomputers. A full-core and real-channel-resolved steady simulation, which analyzes 157 assemblies with each subchannel divided into 125 layers axially, is carried out on the Tianhe Ⅱ supercomputer using 4-6 280 cores. The running time is about 22 h using 4 cores and the running time is 470 s using 6 280 cores. By utilizing hybrid parallel computing, the running time on 6 280 cores is reduced to 397 s.