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Computation of Two-Phase Biomembranes with Phase DependentMaterial Parameters Using Surface Finite Elements

Published online by Cambridge University Press:  03 June 2015

Charles M. Elliott  and
Björn Stinner
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Abstract

The shapes of vesicles formed by lipid bilayers with phase separation are governed by a bending energy with phase dependent material parameters together with a line energy associated with the phase interfaces. We present a numerical method to approximate solutions to the Euler-Lagrange equations featuring triangulated surfaces, isoparametric quadratic surface finite elements and the phase field approach for the phase separation. Furthermore, the method involves an iterative solution scheme that is based on a relaxation dynamics coupling a geometric evolution equation for the membrane surface with a surface Allen-Cahn equation. Remeshing and grid adaptivity are discussed, and in various simulations the influence of several physical parameters is investigated.

Keywords

49Q1065M6074S0574G1574L1582B2692C10Biomembranesurface finite elementsrelaxation dynamics

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Type
Research Article
Information
Communications in Computational Physics , Volume 13 , Issue 2 , February 2013 , pp. 325 - 360
Copyright
Copyright © Global Science Press Limited 2013

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