Berlin 2018 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 21: Microswimmers (joint session BP/CPP/DY)

BP 21.1: Hauptvortrag

Mittwoch, 14. März 2018, 15:00–15:30, H 1028

Emergent Dynamics of Active Particles — •Roland G. Winkler — Institute for Advanced Simulation, Forschungszemtrum Jülich, 52425 Jülich, Germany

The stationary-state structural and dynamical properties of microswimmers are governed by their shape and hydrodynamic interactions, but also the effective dimensionality of the system matters, i.e., three-dimensional bulk versus thin film. As a generic approach for microswimmers, we have developed a model for a spheroidal squirmer, with hydrodynamics implemented by the multiparticle collision dynamics approach [1,2]. We study the swimming behavior, cooperative motion, and motility-induced phase separation (MIPS) of such squirmers in a narrow slit. For two squirmers, surface hydrodynamic interactions strongly influences their cooperative motion [2]. Considering the phase behavior of many squirmers, hydrodynamic interactions suppress MIPS for spherical squirmers. In contrast, hydrodynamic interactions enhance MIPS for elongated squirmers. Moreover, the shape affects the rheological properties of squirmers in shear and Poiseuille flow.

[1] J. Elgeti, R. G. Winkler, G. Gompper, Rep. Prog. Phys. 78, 056601 (2015)

[2] M. Theers, E. Westphal, G. Gompper, R. G. Winkler, Soft Matter 12, 7372 (2016)