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本文提出了核电站冷却水远区热、核污染数值计算的一种新方法。其主要特点是在不规则的三角形网格上,对核电站水环境的潮流和热、核污染采用分步杂交方法进行计算。在前半分步,对于对流算子采用迎风离散格式或改型特征线方法进行处理;在后半分步,对于扩散算子,采用集中质量的有限元方法进行计算。计算潮流时,采用有限体积元方法求解水位方程。本方法算法简单,稳定性好,能适应不规则的几何形状和各种边界条件,并已实际应用于拟建核电站冷却水远区热污染的预测。
This paper presents a new method for the numerical calculation of thermal and nuclear contamination in the far-field cooling water of nuclear power plants. Its main feature is the irregular triangle grid, the flow of nuclear power plant water environment and thermal, nuclear contamination using step-by-step hybrid method to calculate. In the first half step, the convection operator is treated by the upwind discrete scheme or the modified characteristic line method. In the latter half step, the diffusion operator is calculated by using the finite element method with concentrated mass. When calculating the trend, the finite volume element method is used to solve the water level equation. The proposed method has the advantages of simple algorithm, good stability, adaptability to irregular geometric shapes and various boundary conditions, and has been actually applied to predict the thermal pollution in the far area of the cooling water of a nuclear power station.