Regensburg 2013 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 18: Statistical Physics Far from Thermal Equilibrium

DY 18.8: Talk

Wednesday, March 13, 2013, 11:30–11:45, H48

Vortex arrays as emergent collective phenomena for circle swimmers — •Andreas Kaiser and Hartmut Löwen — Institut für Theoretische Physik II: Weiche Materie, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40225 Düsseldorf, Germany

Collective properties of many rod-like circle swimmers are explored by computer simulations in two spatial dimensions. In the model considered, the center of mass of a single swimmer moves on a circle with radius R. Therefore the model provides an interpolation between an interacting self-propelled-rod model for linear swimmers (R→∞) [1] and that of interacting passive rotors (R=0) [2]. We map out the state diagram for various swimmer densities and radii R. We characterize vortices of single swimmers and vortices of swimmer pairs using structural and dynamical diagnostics. Furthermore, a simple theory is proposed to predict the topology of the state diagram.

[1] H. H. Wensink and H. Löwen, J. Phys.: Condens. Matter 24, 464130 (2012).

[2] R. Kirchhoff and H. Löwen, EPL 69, 291 (2005).