Regensburg 2016 – scientific programme
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BP: Fachverband Biologische Physik
BP 19: Posters - Membranes and Vesicles
BP 19.1: Poster
Monday, March 7, 2016, 17:30–19:30, Poster C
Three-dimensional lattice Boltzmann simulations of capsules with viscosity contrast — •Abdallah Daddi-Moussa-Ider1, Badr Kaoui2,3,1, and Stephan Gekle1 — 1Biofluid Simulation and Modeling, University of Bayreuth, 95440 Bayreuth, Germany — 2CNRS - University of Technology of Compiègne, UMR 7338 - Biomechanics and Bioengineering, 60200 Compiègne, France — 3Theoretical Physics I, University of Bayreuth, 95440 Bayreuth, Germany
We study dynamics and deformation of a spherical capsule subjected to shear flow using three-dimensional lattice Boltzmann simulations. The capsule membrane is modeled as a two-dimensional surface exhibiting resistance toward shearing, area dilatation and bending. The two-way coupling, between the fluid and the capsule, is ensured by the immersed boundary method. The viscosity contrast, between the viscosities of the encapsulated and the suspending fluids, is implemented by extending the method proposed in [Kaoui and Harting, Two-dimensional lattice Boltzmann simulations of vesicles with viscosity contrast, Rheologica Acta (2015)] to the three-dimensional case. We benchmarked our method against other previous methods in literature and we got perfect agreement for a wide range of the viscosity contrasts. Afterward we studied shape recovery of a capsule, after cessation of the applied shear flow, and we found that deformation decays exponentially with a characteristic time that depends on the membrane elastic properties and on the viscosity contrast.