期刊
JOURNAL OF COMPUTATIONAL PHYSICS
卷 257, 期 -, 页码 278-297出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcp.2013.10.004
关键词
Dendrite formation; Phase field method; Solidification microstructure; Parallel computing
资金
- Natural Science Foundation of China [51205229]
- UK Royal Academy of Engineering/Royal Society through the Newton International Fellowship Scheme
- EPSRC Centre for Innovative Manufacture: Liquid Metal Engineering [EP/H026177/1]
- innovation platform for through process modeling and simulation of advanced materials processing technologies project in China
- EPSRC [EP/H026177/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H026177/1] Funding Source: researchfish
Alloy dendrite growth during solidification with coupled thermal-solute-convection fields has been studied by phase field modeling and simulation. The coupled transport equations were solved using a novel parallel-multigrid numerical approach with high computational efficiency that has enabled the investigation of dendrite growth with realistic alloy values of Lewis number similar to 10(4) and Prandtl number similar to 10(-2). The detailed dendrite tip shape and character were compared with widely recognized analytical approaches to show validity, and shown to be highly dependent on undercooling, solute concentration and Lewis number. In a relatively low flow velocity regime, variations in the ratio of growth selection parameter with and without convection agreed well with theory. (C) 2013 Elsevier Inc. All rights reserved.
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