相场参数对强制流动下枝晶生长影响的模拟研究

Effect of Phase Field Parameters on the Dendritic Growth in a Forced Convection

摘要:

基于相场方法对强制流动下的纯物质凝固过程进行数值模拟，研究流速、过冷度、耦合参数、各向异性参数对枝晶生长的影响。结果表明：强制流动下的晶核生长为非对称的枝晶，迎流方向的枝晶臂尖端生长得到促进、逆流方向的受到抑制、垂直流方向则影响很小；随着过冷度、耦合参数、各向异性值的增大，3个方向的枝晶臂生长速度均增加

Abstract:

Numerical simulation based on the phase field method is developed to describe the solidification process of pure material in a forced convection. The effects of forced convection, undercooling, coupling parameter and anisotropy on the dendritic growth are investigated. These results indicate that the crystal grow exhibits an asymmetrical dendritic in a forced convection. The upstream arm tip growth is promoted and inhibited on the downstream arm, while restrained for the perpendicular arm. With the increase of undercooling, coupling parameter and anisotropy, the dendritic arm growth velocities increase in the three different directions