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The sharp-interface limit of the Cahn-Hilliard/Navier-Stokes model for binary fluids
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. (Luca Brandt)
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2013 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 714, 95-126 p.Article in journal (Refereed) Published
Abstract [en]

The Cahn-Hilliard model is increasingly often being used in combination with the incompressible Navier-Stokes equation to describe unsteady binary fluids in a variety of applications ranging from turbulent two-phase flows to microfluidics. The thickness of the interface between the two bulk fluids and the mobility are the main parameters of the model. For real fluids they are usually too small to be directly used in numerical simulations. Several authors proposed criteria for the proper choice of interface thickness and mobility in order to reach the so-called 'sharp-interface limit'. In this paper the problem is approached by a formal asymptotic expansion of the governing equations. It is shown that the mobility is an effective parameter to be chosen proportional to the square of the interface thickness. The theoretical results are confirmed by numerical simulations for two prototypal flows, namely capillary waves riding the interface and droplets coalescence. The numerical analysis of two different physical problems confirms the theoretical findings and establishes an optimal relationship between the effective parameters of the model.

Place, publisher, year, edition, pages
2013. Vol. 714, 95-126 p.
Keyword [en]
capillary flows, diffuse interface methods, drops and bubbles, interfacial flows (free surface)
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-118219DOI: 10.1017/jfm.2012.461ISI: 000313514400005ScopusID: 2-s2.0-84871868948OAI: diva2:605054

QC 20130213

Available from: 2013-02-13 Created: 2013-02-13 Last updated: 2013-02-14Bibliographically approved

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Picano, Francesco
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MechanicsLinné Flow Center, FLOW
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