强迫对流影响二元合金非等温凝固枝晶生长的相场法模拟

在二元合金相场模型的研究基础上，建立了耦合溶质场、温度场和流场的相场模型，采用Simple算法求解质量和动量守恒方程，用交替隐式有限差分法求解温度控制方程，模拟了流场作用下二元合金等温和非等温凝固过程中枝晶的生长过程，研究了流场对枝晶生长形貌、溶质场和温度场分布情况的影响，将流场作用下二元合金等温和非等温凝固枝晶生长过程进行比较，分析了由于凝固潜热的释放对流场作用下凝固枝晶生长的影响． 关键词： 相场法 对流 非等温凝固 枝晶生长

Phase-field simulation of non-isothermal solidification dendrite growth of binary alloy under the force flow

Based on the binary phase-field model, the phase-field model coupling with solute field, temperature field and flow field was developed. The mass and momentum conservation equations are solved by using the Simple algorithm, and the thermal governing equation is numerically solved using an alternating implicit finite difference method. The dendrite growth processes during isothermal and non-isothermal solidification of the binary alloy under convection was simulated. The difference in dendrite growth, solute distribute and temperature distribution were investigated. The result of dendrite growth during isothermal and non-isothermal solidification were compared. The effect of latent heat on the dendrite growth under convection was analyzed.