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Issue 28, 2019
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Collective dynamics in a monolayer of squirmers confined to a boundary by gravity

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Abstract

We present a hydrodynamic study of a monolayer of squirmer model microswimmers confined to a boundary by strong gravity using the simulation method of multi-particle collision dynamics. The squirmers interact with each other via their self-generated hydrodynamic flow fields and thereby form a variety of fascinating dynamic states when density and squirmer type are varied. Weak pushers, neutral squirmers, and pullers have an upright orientation. With their flow fields they push neighbors away and thereby form a hydrodynamic Wigner fluid at lower densities. Furthermore, states of fluctuating chains and trimers, of kissing, and at large densities a global cluster exist. Finally, pushers at all densities can tilt against the wall normal and their in-plane velocities align to show swarming. It turns into chaotic swarming for strong pushers at high densities. We characterize all these states quantitatively.

Graphical abstract: Collective dynamics in a monolayer of squirmers confined to a boundary by gravity

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Supplementary files

Article information


Submitted
01 May 2019
Accepted
18 Jun 2019
First published
21 Jun 2019

This article is Open Access

Soft Matter, 2019,15, 5685-5694
Article type
Paper

Collective dynamics in a monolayer of squirmers confined to a boundary by gravity

J. Kuhr, F. Rühle and H. Stark, Soft Matter, 2019, 15, 5685 DOI: 10.1039/C9SM00889F

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