Dendritic Growth Under Natural and Forced Convection in Al-Cu Alloys: From Equiaxed to Columnar Dendrites and from 2D to 3D Phase-Field Simulations
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The interaction between convection and solute transport during solidification has significant influence on the dendritic evolution. By employing the phase-field lattice-Boltzmann approach together with the parallel and adaptive-mesh-refinement algorithm, the dendritic evolution under convection is simulated in both 2D and 3D cases. The flow-induced redistribution of the solute alters both tip velocity and the development of dendritic arms. The effect of both convection and undercooling is quantified and compared using the length ratio of the dendritic arms. The effect of convection behavior (i.e., natural and forced) and domain dimension (i.e., 2D and 3D) on dendritic growth is discussed. Results show that the convection effect is mainly dominated by the convection mode, and the melt flow in 2D can produce biased results comparing with those in 3D.
This work was financially supported by the Joint Funds of the National Natural Science Foundation of China (Grant Number U1537202), the Tsinghua-General Motors International Collaboration Project (Grant Number 20153000354), the Tsinghua University Initiative Scientific Research Program (Grant Number 20151080370), and the Tsinghua Qingfeng Scholarship (THQF-2015). The authors would also like to thank the National Laboratory for Information Science and Technology in Tsinghua University for access to supercomputing facilities.
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