Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 67: Poster: Active Matter, Microswimmers

DY 67.9: Poster

Thursday, March 15, 2018, 15:30–18:00, Poster A

Bead-spring modelling of the triangular three-sphere swimmer — •Sebastian Ziegler¹, Jens Harting², Alexander Sukhov², and Ana-Sunčana Smith¹ — ¹PULS Group, Department of Physics and Cluster of Excellence: EAM, Friedrich-Alexander University Erlangen-Nürnberg, Nägelsbachstr. 49b, Erlangen, Germany — ²Helmholtz Institute Erlangen-Nürnberg for Renewable Energy, Fürther Straße 248, Nürnberg, Germany

A customary approach to model mechanical micropropulsion is to impose the swimming stroke. However, with this approach, the hydrodynamic features of the motion are in essence smoothed over and the problem becomes a purely geometrical one. The alternative approach, yet significantly more demanding, is to specify not the swimming stroke itself but the forces which drive the swimming motion. The swimming stroke then emerges in response to the various forces acting in the system. We use this latter approach to study the behaviour of a triangular-shaped bead-spring microswimmer under the influence of external magnetic field under the condition of no net external force and torque. This swimmer evolves in a versatile manner in dependence of its own geometry and its parameters (viscosity of the fluid, spring constant, shape) and exhibits a resonant behaviour for varying driving frequency.