捕获溶质扩散层边界法优化二维枝晶生长的相场法模拟  

Optimized Simulation of Two Dimensional Dendritic Growth by Capturing the Solute Diffusion Layer's Boundary

作　　者：龙文元[1] 王刚[1] 尧军平[1] 王伟[1] 

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2014年第4期378-380,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51165036)

摘　　要：在枝晶生长相场法模拟中,提出了捕获溶质扩散层边界法进行算法的优化。即不必每一步对计算区域内所有网格进行计算,以通过减少计算循环次数来节省模拟计算时间。在二维网格x和y方向上捕获离晶体中心最远溶质扩散层边界,计算时只对边界范围以内的网格进行计算。通过该方法可减少相场模型的计算时间,模拟二维枝晶生长的形貌和溶质场分布与优化前基本一致。The method of capturing the solute diffusion layer＇s boundary was proposed in the process of dendritic growth simulating by the phase-field method. It not necessary to calculate all grid of calculation area, and the computational time can be saved by the reduction of computation＇s loop. The solute diffu- sion layer＇s boundary is captured in the direction of two-dimensional grid x and y. The calculations are performed only in the grid within the boundary, therefore the calculation time of phase-field model is de- creased greatly. The simulation results of dendrite morphology and the solute field in two-dimensional dendritic growth are agreement well with that before algorithm optimization.

关 键 词：相场法 微观组织 枝晶生长 溶质扩散层边界 

分 类 号：O78[理学—晶体学]