Regensburg 2019 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 52: Poster: Active Matter, Microswimmer, Microfluidics

DY 52.7: Poster

Thursday, April 4, 2019, 15:00–18:00, Poster B2

Shape-anisotropic microswimmers: Influence of hydrodynamics — •Arne W. Zantop and Holger Stark — Institute of Theoretical Physics, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany

Active components that constitute active matter, as for example bacteria or active filaments, are often elongated in shape. The shape and the stiffness of the active components clearly influence both their individual as well as their collective dynamics and pattern formation.

On length scales several orders larger than the size of the constituents, active materials exhibit many fascinating phenomena distinct from their passive counterparts such as the formation of vortices or turbulent structures. While these phenomena have already been studied both in experiments and simulations [1,2], identifying the individual role of thermal fluctuations as well as direct steric and hydrodynamic interactions is still subject of current research.

In this context, we numerically model shape-anisotropic microswimmers with rod shape by composing them from overlapping spherical squirmers [3]. We simulate the hydrodynamic flow field initiated by the active rods using the method of multi-particle collision dynamics. We present results for the collective dynamics of the active rods varying their area fraction, Peclet number, and aspect ratio.
[1] Dunkel et al., PRL 110.22 (2013): 228102.

[2] Wensink et al., PNAS 109.36 (2012): 14308-14313.

[3] Downton et al., J. of Ph.: Cond. Mat. 21.20 (2009): 204101.