Stochastic Rotation Dynamics simulations of wetting multi-phase flows

Hiller, Thomas, Sanchez de La Lama, Marta and Brinkmann, Martin (2016) Stochastic Rotation Dynamics simulations of wetting multi-phase flows. Journal of Computational Physics, 315. pp. 554-576. ISSN 0021-9991

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Abstract

Multi-color Stochastic Rotation Dynamics (SRDmc) has been introduced by Inoue et al. as a particle based simulation method to study the flow of emulsion droplets in nonwetting microchannels. In this work, we extend the multi-color method to also account for different wetting conditions. This is achieved by assigning the color information not only to fluid particles but also to virtual wall particles that are required to enforce proper no-slip boundary conditions. To extend the scope of the original SRDmc algorithm to e.g. immiscible two-phase flow with viscosity contrast we implement an angular momentum conserving scheme (SRDmc+). We perform extensive benchmark simulations to show that a mono-phase SRDmc fluid exhibits bulk properties identical to a standard SRD fluid and that SRDmc fluids are applicable to a wide range of immiscible two-phase flows. To quantify the adhesion of a SRDmc+ fluid in contact to the walls we measure the apparent contact angle from sessile droplets in mechanical equilibrium. For a further verification of our wettability implementation we compare the dewetting of a liquid film from a wetting stripe to experimental and numerical studies of interfacial morphologies on chemically structured surfaces.

Item Type:	Article
Uncontrolled Keywords:	Multi-phase fluid flows, Meso-scale simulations, Stochastic Rotation Dynamics, Wettability
Subjects:	F300 Physics
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	Paul Burns
Date Deposited:	23 Oct 2019 15:30
Last Modified:	23 Oct 2019 15:30
URI:	http://nrl.northumbria.ac.uk/id/eprint/41212

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