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在二元合金相场模型研究的基础上,建立了耦合溶质场和流场的相场模型。采用有限差分法对相场模型进行数值求解,模拟了流场作用下Al-4.5wt%Cu合金凝固过程中的枝晶演化。质量和动量守恒方程采用Simple算法进行求解,解决了因压力带来的求解难题。通过数值模拟研究了强迫对流流速对枝晶生长形貌和溶质场分布情况的影响,并分析了对流速度对上游、下游和法向枝晶主干尖端生长速率和曲率半径的影响。
Based on the study of binary alloy phase field model, a phase field model of coupled solute field and flow field was established. The phase difference model was solved numerically by finite difference method to simulate the dendrite evolution of Al-4.5wt% Cu alloy during the solidification process. The mass and momentum conservation equations are solved using the Simple algorithm, solving the problem of solving problems caused by pressure. The effect of forced convection flow velocity on the dendritic growth morphology and solute field distribution was investigated by numerical simulation. The effects of convection velocity on the growth rate and radius of curvature of the upstream, downstream and normal dendrite core tips were analyzed.