摘要
应用三维元胞自动机模型,耦合求解三维流场控制方程,模拟了来流对Al-Cu合金三维树枝晶生长的影响。结果表明,在来流作用下,背流侧二次枝晶受到抑制,迎流侧二次枝晶发达,枝晶尖端生长速度随来流速度增大而增大,枝晶尖端半径随来流速度增大而减小;与来流方向垂直的枝晶向迎流方向偏转,枝晶尖端来流与背流两侧呈不对称性,随着来流速度增大枝晶尖端不对称性增强。迎流侧枝晶尖端Péclet数随着来流速度的增大而增大。
The three-dimensional (3-D) cellular automaton model is coupled with the numerical solution of momentum to simulate the dendrite growth of Al-Cu alloy in the presence of melt flow. The results show that growth of primary and secondary arm in the upstream direction is much greater than that in the downstream direction. With the increase of the flow velocity, the growth velocity of the upstream dendrite tip is increased, and the radius of upstream dendrite tip is decreased. The growth direction of the primary arm perpendicular to the flow direction tilts into the upstream direction. The dendrite tip of the primary arm perpendicular to the flow direction shows an asymmetric morphology in downstream sides. The degree of tilt and the asymmetry of the tip become stronger with the increase of the forced flow velocity. The Péclet number of the upstream dendrite tip is increased with the increase of the forced flow velocity.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2013年第4期323-327,共5页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51071159
u0837601)
关键词
树枝晶
三维元胞自动机
流动
Dendrite, Three-dimensional Cellular Automaton, Flow
