Berlin 2015 – scientific programme

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BP: Fachverband Biologische Physik

BP 27: Posters: Complex Fluids and Soft Matter

BP 27.1: Poster

Tuesday, March 17, 2015, 14:00–16:00, Poster A

Flux simulations of anisotropic particles in different geometries using lattice Boltzmann method — •Lukas Schrack and Stephan Gekle — Biofluid Simulation and Modeling, Universität Bayreuth

Experiments by Trebbin et al. [1] have shown that anisotropic particles align perpendicular to the flow direction after passing through constricted parts of narrow microchannels.

In order to gain additional insight into the microscopic orientation distribution of such particles, we simulate the flow of rod-like colloids within a restrictive geometry which contains a narrowing section. We use the lattice Boltzmann method as implemented in the software package ESPResSo [2]. We have expanded this software package by integrating cylinders with variable diameter and bifurcations to the alternatives of possible geometries.

Our simulations are performed at low Reynolds numbers and since the alignment process is likely to be a collective phenomena, a large amount of rods is investigated. Each of them consists of single point particles, bonded to each other by a harmonic potential. Stability of the alignment process is of particular interest.

1. M. Trebbin et al., PNAS 110, 17 (2013)
2. A. Arnold et al., Meshfree Methods for Partial Differential Equations VI, Lecture Notes in Computational Science and Engineering 89, 1 23 (2013), Springer