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DY: Fachverband Dynamik und Statistische Physik

DY 30: Poster II

DY 30.22: Poster

Donnerstag, 29. März 2007, 16:00–18:00, Poster D

Vortex formation in Daphnia swarms — •Jürgen Vollmer, Bruno Eckhardt, and Christoph Lange — Fachbereich Physik, Philipps Universität, 35032 Marburg, Germany

We propose a self-propelled particle model for the swarming of Daphnia, which takes into account propulsion of the swimmers, mutual avoidance of close encounters and attraction to a centre. Various key parameters are identified in order to arrive at a phase diagram for qualitatively different steady-state motions. We find that a vertex is formed only in a finite range of propulsions, and analyse its transitions to other states. Hydrodynamic interaction between the swimmers can stabilise the vortex and change its velocity profile.