Modeling ternary fluids in contact with elastic membranes

Marianna Pepona, Alvin C. M. Shek, Ciro Semprebon, Timm Krüger, Halim Kusumaatmaja*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

We present a thermodynamically consistent model of a ternary fluid interacting with elastic membranes. Following a free-energy modeling approach for the fluid phases, we derive the governing equations for the dynamics of the ternary fluid flow and membranes. We also provide the numerical framework for simulating such fluid-structure interaction problems. It is based on the lattice Boltzmann method for the ternary fluid (Eulerian description) and a finite difference representation of the membrane (Lagrangian description). The ternary fluid and membrane solvers are coupled through the immersed boundary method. For validation purposes, we consider the relaxation dynamics of a two-dimensional elastic capsule placed at a fluid-fluid interface. The capsule shapes, resulting from the balance of surface tension and elastic forces, are compared with equilibrium numerical solutions obtained by surface evolver. Furthermore, the Galilean invariance of the proposed model is proven. The proposed approach is versatile, allowing for the simulation of a wide range of geometries. To demonstrate this, we address the problem of a capillary bridge formed between two deformable capsules.

Original languageEnglish
Article number022112
Number of pages18
JournalPhysical review. E
Volume103
Issue number2
DOIs
Publication statusPublished - 8 Feb 2021

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