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On Fully Decoupled, Convergent Schemes for Diffuse Interface Models for Two-Phase Flow with General Mass Densities

Published online by Cambridge University Press:  17 May 2016

Günther Grün*
Affiliation:
Friedrich-Alexander-Universität Erlangen-Nürnberg, Department Mathematik, Cauerstr. 11, 91058 Erlangen, Germany
Francisco Guillén-González*
Affiliation:
Universidad Sevilla, Dpto. Ecuaciones Diferenciales y Análisis Numérico, Instituto de Matemáticas, Aptdo. 1160, 41080, Sevilla, Spain
Stefan Metzger*
Affiliation:
Friedrich-Alexander-Universität Erlangen-Nürnberg, Department Mathematik, Cauerstr. 11, 91058 Erlangen, Germany
*
*Corresponding author. Email addresses:gruen@am.uni-erlangen.de (G. Grün), guillen@us.es (F. Guillén-Gonzalez), stefan.metzger@fau.de (S. Metzger)
*Corresponding author. Email addresses:gruen@am.uni-erlangen.de (G. Grün), guillen@us.es (F. Guillén-Gonzalez), stefan.metzger@fau.de (S. Metzger)
*Corresponding author. Email addresses:gruen@am.uni-erlangen.de (G. Grün), guillen@us.es (F. Guillén-Gonzalez), stefan.metzger@fau.de (S. Metzger)

Abstract

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In the first part, we study the convergence of discrete solutions to splitting schemes for two-phase flow with different mass densities suggested in [Guillen-Gonzalez, Tierra, J.Comput.Math. (6)2014]. They have been formulated for the diffuse interface model in [Abels, Garcke, Grün, M3AS, 2012, DOI:10.1142/S0218202511500138] which is consistent with thermodynamics. Our technique covers various discretization methods for phase-field energies, ranging from convex-concave splitting to difference quotient approaches for the double-well potential. In the second part of the paper, numerical experiments are presented in two space dimensions to identify discretizations of Cahn-Hilliard energies which are ϕ-stable and which do not reduce the acceleration of falling droplets. Finally, 3d simulations in axial symmetric geometries are shown to underline even more the full practicality of the approach.

Information

Type
Research Article
Copyright
Copyright © Global-Science Press 2016