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Emerging Mesoscale Flows and Chaotic Advection in Dense Active Matter.


Type

Article

Change log

Authors

Keta, Yann-Edwin 
Klamser, Juliane U 
Jack, Robert L 
Berthier, Ludovic 

Abstract

We study two models of overdamped self-propelled disks in two dimensions, with and without aligning interactions. Both models support active mesoscale flows, leading to chaotic advection and transport over large length scales in their homogeneous dense fluid states, away from dynamical arrest. They form streams and vortices reminiscent of multiscale flow patterns in turbulence. We show that the characteristics of these flows do not depend on the specific details of the active fluids, and result from the competition between crowding effects and persistent propulsions. This observation suggests that dense active suspensions of self-propelled particles present a type of "active turbulence" distinct from collective flows reported in other types of active systems.

Description

Keywords

4012 Fluid Mechanics and Thermal Engineering, 40 Engineering, 51 Physical Sciences

Journal Title

Phys Rev Lett

Conference Name

Journal ISSN

0031-9007
1079-7114

Volume Title

132

Publisher

American Physical Society (APS)
Sponsorship
Leverhulme Trust (VP1-2019-029)