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Main Title: Collective dynamics in a monolayer of squirmers confined to a boundary by gravity
Author(s): Kuhr, Jan-Timm
Rühle, Felix
Stark, Holger
Type: Article
Language Code: en
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.
Issue Date: 21-Jun-2019
Date Available: 15-Aug-2019
DDC Class: 532 Mechanik der Fluide, Mechanik der Flüssigkeiten
Subject(s): squirmer
collision dynamics
hydrodynamic flow field
Wigner fluid
Sponsor/Funder: DFG, 87159868, GRK 1558: Kollektive Dynamik im Nichtgleichgewicht: in kondensierter Materie und biologischen Systemen
DFG, 237143019, SPP 1726: Mikroschwimmer - Von Einzelpartikelbewegung zu kollektivem Verhalten
TU Berlin, Open-Access-Mittel - 2019
Journal Title: Soft Matter
Publisher: Royal Society of Chemistry
Publisher Place: London
Volume: 15
Issue: 28
Publisher DOI: 10.1039/C9SM00889F
Page Start: 5685
Page End: 5694
EISSN: 1744-6848
ISSN: 1744-683X
Appears in Collections:FG Statistische Physik weicher Materie und biologischer Systeme » Publications

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