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球床式氟盐冷却高温堆(Pebble Bed Fluoride-salt Cooled High Temperature Reactor,PB-FHR)是一种先进的第四代反应堆。三维堆芯热工水力程序能够模拟具有复杂空间效应的工况,但计算耗时较高。图形处理器(Graphics Processing Unit,GPU)具有大量计算单元,可有效提高程序的计算速度。本文研发了GPU加速的PB-FHR堆芯热工水力程序(GPU-accelerated Thermal Hydraulic Code,GATH),采用非热平衡多孔介质模型建立堆芯物理模型,研究并实现了GPU高速求解算法。对PB-FHR的堆芯模型进行了热工水力分析,与商用计算流体力学软件ANSYS CFX的计算结果进行了对比,验证了程序的正确性。GPU加速性能分析的结果表明,程序整体的加速比率可达8.39倍,证明所研发的GPU求解算法能有效提升堆芯热工水力分析的计算效率。
Pebble Bed Fluoride-salt Cooled High Temperature Reactor (PB-FHR) is an advanced fourth-generation reactor. Three-dimensional core thermal hydraulic program can simulate complex space effect conditions, but the calculation time-consuming. Graphics Processing Unit (GPU) has a large number of computing units, which can effectively improve the calculation speed of the program. GPU-accelerated Thermal Hydraulic Code (GPU) was developed in this paper. Non-thermal equilibrium porous media model was used to establish the physical model of the core, and the GPU high-speed algorithm was researched and implemented. The thermodynamic and hydraulic analysis of the core model of PB-FHR was carried out, and compared with the calculation results of commercial computational fluid dynamics software ANSYS CFX, the correctness of the program was verified. GPU acceleration performance analysis results show that the overall program accelerates up to 8.39 times, proving that the developed GPU solution algorithm can effectively improve the computational efficiency of core thermal hydraulic analysis.