基于VOF-CA-LB耦合模型的枝晶运动行为研究

Dendrite Motion Behavior Based on VOF-CA-LB Coupling Model

将计算流体力学中的流体体积函数法与模拟枝晶生长的元胞自动机模型耦合,研究凝固过程的晶粒运动行为。结果表明,流体体积函数法具有良好的界面保真性,可准确追踪固-液界面,不会对后续的枝晶生长计算产生影响;枝晶的运动行为会影响熔体中的溶质分布,从而影响枝晶的生长形态。该耦合模型可准确模拟枝晶运动过程,解决了元胞自动机方法研究晶粒运动行为无法同时满足高形状保真性和高计算效率的问题。

The fluid volume function method was coupled with cellular automata model to investigate the motion behavior of grain during solidification process.The simulation results indicate that the fluid volume function method exhibits desirable interface fidelity,and can track the solid-liquid interface with a small error,which has little effects on the subsequent calculation of dendritic growth.The motion behavior of dendrites can affect the solute distribution in the melt,thus affecting the growth morphology of dendrites.The coupled model can simulate the dendrite motion process with a small error,solving the difficulty in satisfying the high shape fidelity and high computational efficiency of cellular automata method.