Regensburg 2016 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 27: Computational Biophysics

BP 27.6: Vortrag

Dienstag, 8. März 2016, 11:15–11:30, H43

Bending algorithms for soft objects: Challenge and bane — •Achim Guckenberger, Marcel Schraml, and Stephan Gekle — Biofluid Simulation and Modeling, Universität Bayreuth, Germany

Vesicles, capsules and red blood cells all share a common property, namely the resistance towards bending of their surface, an important ingredient for quantitative simulations. Unfortunately, accurate computation of these bending forces on typical surface discretizations such as flat triangles is far from being trivial.

Starting from the famous Helfrich model, we present and analyze five substantially different algorithms for the computation of the force density on triangulated meshes. Their quality is evaluated quantitatively by comparing with the analytically obtained values for the typical red blood cell shape. Furthermore, we consider the behavior of an elastic capsule in a linear shear flow using the boundary integral and the Lattice Boltzmann method. Comparisons with the existing literature are provided. We finally make a suggestion for the choice of the appropriate bending algorithm based on the presented results.