基于SIMPLE方法的熔融物凝固模型研究

Research of Solidification Model for the Melt Based on SIMPLE Algorithm

熔融物的冷却特性对熔融物堆内持留过程有着重要的影响,本文使用基于固定网格技术的焓方程方法建立熔融物液相与固相之间的相变数值分析模型,利用SIMPLE算法求解N-S方程和焓方程,通过相变模型分析存在一个两相区的对流-扩散型的熔融物凝固相变过程。利用相变模型可以有效地模拟固液共存的两相区,并利用解析解和基准题验证相变模型的准确性。

The cooling characteristics of the melt have important influence on the process of IVR in a severe accident.An enthalpy formulation based on fixed grid methodology was developed for the numerical solution of convection-diffusion controlled mushy zone phase-change solidification of the melt.The process of the solidification was simulated by solving the N-S equations and the enthalpy formulation equation using the SIMPLE algorithm.The phase-change model could simulate the solidification and mushy zone well,and it was verified by the use of analytical solutions and benchmark problems.