Dresden 2020 – wissenschaftliches Programm
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DY 14.1: 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 . First, we address mixtures of pushers and pullers of otherwise identical properties . 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 . Through resulting imposed hydrodynamic fluid flows, the enclosed microswimmers concentrate in a centered spot, mimicking the behavior of active circle swimmers . 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.
 C. Hoell et al., J. Chem. Phys. 151, 064902 (2019).
 G. Pessot et al., Mol. Phys. 116, 3401 (2018).
 C. Hoell et al., New J. Phys. 19, 125004 (2017).