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DY: Fachverband Dynamik und Statistische Physik

DY 57: Poster - Diffusion

DY 57.13: Poster

Thursday, March 19, 2015, 16:00–18:00, Poster A

Active particles in inhomogeneous environments
— •Kevin Schröer, Martin P. Magiera, and Lothar Brendel — Faculty of Physics and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, D-47047 Duisburg, Germany

Recent molecular dynamics simulations of dense suspensions of self-propelled Brownian spheres show the appearance of self-organized patterns, large-scale collective motion and phase separation via particle agglomeration [1].

In addition to that we follow the idea of an environment-dependent propulsion mechanism by introducing "passivity"-areas in which the propulsion of the particles is suppressed. Accumulation-effects are observed in and around these areas which serve as accumulation-nuclei. The swimmers are modeled in 2D and 3D via Langevin-Dynamics in order to include inertial effects and to reevaluate the latter’s importance for the accumulation process. Further investigations focus on the question to which extent hydrodynamic interactions play a role in the particle interplay and the collective behavior.

References:
A. Wysocki, R.G. Winkler, G. Gompper, EPL 105, 48004 (2014)