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基于金属凝固理论和欧拉多相流体方法,深入分析了连续介质模型和体积平均模型之间的差异与联系,并对铸锭凝固过程中的固-液界面形态和组织演化规律进行理论预测和模拟计算。就达到相同的宏观描述目的而言,连续介质模型仅可以模糊的描述凝固状态的转变规律,而体积平均模型却可以清晰地显示柱状晶-等轴晶转变和晶粒特征;体积平均模型的数值计算工作量过大且十分繁琐,因此,其计算速度要远慢于连续介质模型;模拟结果与实验铸锭吻合良好,证明了本文算法的可行性。
Based on metal solidification theory and Eulerian multiphase fluid method, the differences and relations between continuous medium model and volume average model are deeply analyzed, and the theory and prediction of solid-liquid interface morphology and microstructure evolution in ingot solidification process are theoretically predicted. Simulation calculation. In order to achieve the same macroscopic description purpose, the continuous medium model can only vaguely describe the transformation rule of the solidification state, while the volume average model can clearly show the columnar crystal - equiaxed crystal transformation and grain characteristics; the value of the volume average model Therefore, the computational speed is much slower than that of the continuous medium model. The simulation results are in good agreement with the experimental ingot, which proves the feasibility of the proposed algorithm.