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.
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