Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 67: Poster: Active Matter, Microswimmers

DY 67.11: Poster

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

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

Particles that constitute active matter are often elongated in shape, as for instance bacteria or active filaments. The shape and stiffness influence both their individual and collective dynamics and pattern formation. Previous work has already revealed many insights into, for example, the spontaneous formation of dynamical structures such as vortices or active turbulence [1,2]. Though it still remains to completely identify the interactions that lead to the emergence of these fascinating phenomena and, in particular, to identify the role of long-ranged hydrodynamic interactions [2].

Here, we present an approach for simulating hydrodynamically interacting elongated microswimmers in a fluid environment using multi-particle collision dynamics. To form microswimmers rods, we rigidly bind overlapping spherical squirmers to each other. The single squirmers propel themselves with an imposed surface flow at their no-slip boundaries [3]. We present first results of our simulation study on the role of hydrodynamic interactions in phases of active matter with elongated constitutes.

[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.