Z. Chen
,
C.L.Chen
,
L.M. Hao
金属学报(英文版)
Numerical simulation based on phase field method
is performed to describe solidification process of pure material in
a free or forced flow. The evolution of the interface is showed, and
the effects of mesh grid and flow velocity on succinonitrite shape
are studied. These results indicate that crystal grows into an
equiaxial dendrite in a free flow and into an asymmetrical dendritic
in a forced flow. With increasing flow velocity, the
upstream dendritic arm tip grows faster and the downstream arm grows
slower. However, the evolution of the perpendicular tip has no
significant change. In addition, mesh grid has no influence on
dendritic growth shape when mesh grid is above 300x300.
关键词:
Phase field method
,
null
Yutian DING
金属学报(英文版)
The phase-field model coupled with a flow field was used to simulate the solidification of pure materials by the finite difference method. The effects of initial crystal radius, the space step and the interface thickness on the dendrite growth were studied. Results indicate that the grain grows into an equiaxial dendrite during free flow and into a typical branched structure under forced flow. The radius of an initial crystal can affect the growth of side-branches but not the stability of the dendrite's tip when an appropriate value is assigned to it. With an increase in space steps, side-branches appear at the upstream of the longitudinal principal branch and they grow rapidly. With an increase in the interface thickness, the trunk of the longitudinal upstream and lateral principal branches grow longer and become more slender while the number of secondary branches increases.
关键词:
Phase field method
,
强制对流
,
枝晶生长
,
模拟
