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Macrosegregation simulation model based on Lattice-Boltzmann method with high computational efficiency

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Title: Macrosegregation simulation model based on Lattice-Boltzmann method with high computational efficiency
Authors: Ohno, Munekazu Browse this author →KAKEN DB
Sato, Hayato Browse this author
Keywords: Macrosegregation
Lattice-Boltzmann method
Continuous casting
Ingot casting
Issue Date: Dec-2018
Publisher: Elsevier
Journal Title: International journal of heat and mass transfer
Volume: 127
Start Page: 561
End Page: 570
Publisher DOI: 10.1016/j.ijheatmasstransfer.2018.07.076
Abstract: A macrosegregation simulation model is developed by coupling solute and energy conservation equations with Lattice-Boltzmann Method (LBM), newly developing technique of computational fluid dynamics. Effect of the solidification shrinkage is taken into account in the present LBM as well as effects of the Darcy's flow and thermos-solutal convection. The present LBM-coupled model is based on modified lattice Bhadnager-Gross-Krook method, the numerical stability of which is better than that of the standard LBM. Accordingly, the present LBM-coupled model can be applied to simulations of macrosegregation behaviors in metallic alloy systems that cannot be handled by the previous LBM-coupled model. The validity of the model was demonstrated by comparing the results for steady-state flows with those of analytical solutions and a conventional model based on the Navier-Stokes equation. In addition, the computational speed of the present model is compared with the one of conventional model in cases of lateral directional solidification of Sn-Bi alloy and continuous casting of a steel slab. It is shown that the present LBM-coupled model enables remarkably faster computation than the conventional model especially in the latter case. (C) 2018 Elsevier Ltd. All rights reserved.
Rights: ©2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大野 宗一

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