Phase field study of the tip operating state of a freely growing dendrite against convection using a novel parallel multigrid approach

Authors:
Z. Guo;J. Mi;S. Xiong;P. S. Grant
Affiliations:
School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;Department of Engineering, University of Hull, East Yorkshire, HU6 7RX, UK;School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK
Venue:
Journal of Computational Physics
Year:
2014

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Abstract

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 ~10^4 and Prandtl number ~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.