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Simulation of two-phase flow with moving immersed boundaries
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
2011 (English)In: International Journal for Numerical Methods in Fluids, ISSN 0271-2091, E-ISSN 1097-0363, Vol. 67, no 12, 2062-2080 p.Article in journal (Refereed) Published
Abstract [en]

A two-dimensional multi-phase model for immiscible binary fluid flow including moving immersed objects is presented. The fluid motion is described by the incompressible NavierStokes equation coupled with a phase-field model based on van der Waals' free energy density and the CahnHilliard equation. A new phase-field boundary condition was implemented with minimization of the free energy in a direct way, to specifically improve the physical behavior of the contact line dynamics for moving immersed objects. Numerical stability and execution time were significantly improved by the use of the new boundary condition. Convergence toward the analytical solution was demonstrated for equilibrium contact angle, the LucasWashburn theory and Stefan's problem. The proposed model may be used for multi-phase flow problems with moving boundaries of complex geometry, such as the penetration of fluid into a deformable, porous medium.

Place, publisher, year, edition, pages
2011. Vol. 67, no 12, 2062-2080 p.
Keyword [en]
fluid-structure interaction, immersed boundary, moving boundary, two-phase flow
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-55229DOI: 10.1002/fld.2484ISI: 000297736100018Scopus ID: 2-s2.0-83255186838OAI: oai:DiVA.org:kth-55229DiVA: diva2:471667
Funder
EU, European Research Council
Note
QC 20120102Available from: 2012-01-02 Created: 2012-01-02 Last updated: 2017-12-08Bibliographically approved

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