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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: Microswimmers (joint session DY/CPP)

CPP 34.1: Hauptvortrag

Montag, 16. März 2020, 15:00–15:30, ZEU 160

Microswimmers in (semi-)dilute suspensions: binary mixtures, trapping, orientational ordering, collective motion, and imposed shear flows — Christian Hoell, Giorgio Pessot, Hartmut Löwen, and •Andreas M. Menzel — Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany

Active microswimmers self-propel while setting the surrounding fluid into motion. This leads to hydrodynamic swimmer interactions and can enable emergent collective behavior. Extending our corresponding statistical characterization of (semi-)dilute microswimmer suspensions, we have derived a dynamical density functional theory to describe binary microswimmer mixtures [1]. First, we address mixtures of pushers and pullers of otherwise identical properties [1]. We find that the majority species hydrodynamically imposes its behavior onto the minority species, both under spherical confinement and for unbounded planar motion [1,2]. Particularly, this concerns emergent polar orientational order. Second, we consider trapped active microswimmers confined by a ring of driven passive particles [1]. Through resulting imposed hydrodynamic fluid flows, the enclosed microswimmers concentrate in a centered spot, mimicking the behavior of active circle swimmers [3]. Since frequently in nature many active species interact with each other under confinement, we consider our extensions essential on the path of statistically characterizing corresponding biological systems.

[1] C. Hoell et al., J. Chem. Phys. 151, 064902 (2019).

[2] G. Pessot et al., Mol. Phys. 116, 3401 (2018).

[3] C. Hoell et al., New J. Phys. 19, 125004 (2017).