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针对金属燃料的显著辐照肿胀变形,开发基于紧密多物理耦合计算的数值燃料棒模型及相应程序YUAN。YUAN是一个通用的燃料棒多物理数值模拟平台,可在燃耗过程中基于独特的浮动网格耦合地求解中子学、热工水力、机械力学问题,模拟燃料棒在反应堆内极端环境下的热传导、机械变形、中子输运、核素燃耗等行为。利用YUAN对典型金属燃料进行模拟,分析金属燃料由于变形产生的多物理效应对传热、中子学的影响。
Aiming at the significant irradiation and swelling deformation of metal fuel, a numerical fuel rod model based on close multiphysics coupling calculation and its corresponding program were developed. YUAN is a universal fuel rod multiphysics numerical simulation platform that solves neutron, thermal, hydraulic and mechanical problems based on a unique floating grid during burnup, simulates the fuel rods in an extreme environment in the reactor Heat conduction, mechanical deformation, neutron transport, nuclear fuel burn behavior. YUAN was used to simulate typical metal fuels, and the influence of multi-physics effects of metal fuels on heat transfer and neutronics was analyzed.