Lattice Boltzmann modeling of dendritic growth in a forced melt convection

被引：138

作者：

Sun, Dongke ^{[1
]}

Zhu, Mingfang ^{[1
]}

Pan, Shiyan ^{[1
]}

Raabe, Dierk ^{[2
]}

机构：

[1] Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Adv Met Mat, Nanjing 211189, Jiangsu, Peoples R China

[2] Max Planck Inst Eisenforsch GmbH, D-4000 Dusseldorf, Germany

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Modeling; Dendritic growth; Lattice Boltzmann method; Convection; Diffusion; CELLULAR-AUTOMATON MODEL; LEVEL SET SIMULATION; BOUNDARY-CONDITIONS; PHASE-TRANSITION; FRONT-TRACKING; SOLIDIFICATION; FLOW; ALLOYS; EQUATION;

D O I：

10.1016/j.actamat.2008.12.019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A two-dimensional (2D) lattice Boltzmann-based model is developed to simulate solutal dendritic growth of binary alloys in the presence of forced flow. The model adopts the lattice Boltzmann method (LBM) that describes transport phenomena by the evolution of distribution functions of Moving pseudoparticles to numerically solve fluid flow and Solute transport governed by both convection and diffusion. Based on the LBM-calculated solutal field, the dynamics of dendritic growth is determined according to a previously proposed local solutal equilibrium approach. After detailed model analysis and validation, the model is applied to simulate single and equiaxed multidendritic growth of Al-Cu alloys with forced convection. The results demonstrate the quantitative, numerically stable and computationally efficient capabilities of the proposed model. It is found that the solute distribution and dendritic growth are strongly influenced by convection. producing asymmetrical dendrites that row faster in the upstream direction. but mostly slower in the downstream direction. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1755 / 1767

页数：13

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