蒙特卡罗粒子输运软件JMCT非结构网格计算功能开发及检验  

Development and Test of Unstructured Mesh Simulation Function Based on JMCT Monte Carlo Particle Transport Code

作　　者：谭笑 邓力[2] 王鑫 李瑞 付元光 史敦福 刘鹏 杨超 TAN Xiao;DENG Li;WANG Xin;LI Rui;FU Yuanguang;SHI Dunfu;LIU Peng;YANG Chao(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Institute of Applied Physics and Computational Mathematics,Beijing 100094,China;CAEP Software Centre for High Performance Numerical Simulation,Beijing 100088,China)

机构地区：[1]南华大学核科学技术学院,湖南衡阳421001 [2]北京应用物理与计算数学研究所,北京100094 [3]中物院高性能数值模拟软件中心,北京100088

出　　处：《原子能科学技术》2024年第12期2540-2545,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金(12275030)。

摘　　要：为开展蒙特卡罗方法及程序与确定论方法及程序之间的耦合计算,针对三维通用型多粒子输运蒙特卡罗软件JMCT,新近开发了支持非结构网格输运计算功能,使JMCT软件具备计算任意三维实体组合几何、结构和非结构网格下的粒子输运问题。选取秦山一期反应堆焊缝段屏蔽模型,分别采用3种几何离散处理,通过大规模并行计算取得了相近的结果,与实验测量值最大相对偏差小于14.29%,满足屏蔽对计算精度(20%)的要求,从而验证了算法的正确有效性。For coupled calculation of Monte Carlo method and codes with deterministic method and codes,the simulated functions of unstructured mesh have been developed in the 3D general purpose Nparticle transport Monte Carlo code JMCT.At present,the JMCT code supports not only the real combinatorial geometry(CSG)but also the structured/unstructured mesh.In this paper,the shielding model of Qinshan-I reactor core was chosen as testing the new function.Supermesh,a pre-processing software for automatic mesh generation of JMCT software,was used to divide the Qinshan-I model into structured mesh and unstructured mesh model based on the CSG model.The simulated results of three geometry processes were given,respectively.It can be seen from the calculation results that the error of the unstructured mesh under the three geometric descriptions of JMCT is slightly larger than that of the solid combined geometry and the structured mesh.The results of the three geometric treatments are convergent,and the maximum relative deviation from the experimental measured value is less than 14.29%,which meets the requirement of shielding for calculation accuracy(20%).The parallel efficiency of the three geometric models on the Chinese computer with 4000 cores is more than 65%.The calculation time of solid combination geometry is the least,and time of unstructured grid is the longest.

关 键 词：蒙特卡罗 确定论 耦合计算 结构/非结构网格 秦山一期反应堆 

分 类 号：TL329[核科学技术—核技术及应用]