In order to ensure the successful implementation of in-vessel retention strategy to terminate molten corium pool evolution, it is necessary to evaluate the heat flux distribution on the lower head wall of reactor pressure vessel. In the present study, the models of internal heating and natural convention buoyancy, as well as the models of WMLES turbulence and phase changing, were applied in the open source CFD software OpenFOAM to perform numerical simulations for the COPRA single-layer molten pool experiment. The distributions of temperature, heat flux, and crust thickness were obtained. The simulation results were in good comparison with COPRA experimental data, proving the validity of the developed model for corium pool heat transfer characteristics. The simulation method and results could be applied to further in-depth study of thermal behavior in the corium pool.

为了确保成功实施容器内滞留策略以终止熔融的皮质液池析出，有必要评估反应堆压力容器下端壁的热通量分布。在本研究中，将内部加热和自然常规浮力模型以及WMLES湍流和相变模型应用于开源CFD软件OpenFOAM中，以对COPRA单层熔池实验进行数值模拟。得到了温度，热通量和地壳厚度的分布。仿真结果与COPRA实验数据进行了很好的比较，证明了所建立模型对皮质池传热特性的有效性。