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Role of Correlations in the Collective Behavior of Microswimmer Suspensions

Stenhammar, Joakim LU ; Nardini, Cesare; Nash, Rupert W.; Marenduzzo, Davide and Morozov, Alexander (2017) In Physical Review Letters 119(2).
Abstract

In this Letter, we study the collective behavior of a large number of self-propelled microswimmers immersed in a fluid. Using unprecedentedly large-scale lattice Boltzmann simulations, we reproduce the transition to bacterial turbulence. We show that, even well below the transition, swimmers move in a correlated fashion that cannot be described by a mean-field approach. We develop a novel kinetic theory that captures these correlations and is nonperturbative in the swimmer density. To provide an experimentally accessible measure of correlations, we calculate the diffusivity of passive tracers and reveal its nontrivial density dependence. The theory is in quantitative agreement with the lattice Boltzmann simulations and captures the... (More)

In this Letter, we study the collective behavior of a large number of self-propelled microswimmers immersed in a fluid. Using unprecedentedly large-scale lattice Boltzmann simulations, we reproduce the transition to bacterial turbulence. We show that, even well below the transition, swimmers move in a correlated fashion that cannot be described by a mean-field approach. We develop a novel kinetic theory that captures these correlations and is nonperturbative in the swimmer density. To provide an experimentally accessible measure of correlations, we calculate the diffusivity of passive tracers and reveal its nontrivial density dependence. The theory is in quantitative agreement with the lattice Boltzmann simulations and captures the asymmetry between pusher and puller swimmers below the transition to turbulence.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
119
issue
2
publisher
American Physical Society
external identifiers
  • scopus:85025449297
ISSN
0031-9007
DOI
language
English
LU publication?
yes
id
3b736bfa-e921-4614-a775-224b7c82d3eb
alternative location
https://arxiv.org/abs/1703.01892
date added to LUP
2018-01-24 10:46:13
date last changed
2018-06-10 05:26:37
@article{3b736bfa-e921-4614-a775-224b7c82d3eb,
  abstract     = {<p>In this Letter, we study the collective behavior of a large number of self-propelled microswimmers immersed in a fluid. Using unprecedentedly large-scale lattice Boltzmann simulations, we reproduce the transition to bacterial turbulence. We show that, even well below the transition, swimmers move in a correlated fashion that cannot be described by a mean-field approach. We develop a novel kinetic theory that captures these correlations and is nonperturbative in the swimmer density. To provide an experimentally accessible measure of correlations, we calculate the diffusivity of passive tracers and reveal its nontrivial density dependence. The theory is in quantitative agreement with the lattice Boltzmann simulations and captures the asymmetry between pusher and puller swimmers below the transition to turbulence.</p>},
  articleno    = {028005},
  author       = {Stenhammar, Joakim and Nardini, Cesare and Nash, Rupert W. and Marenduzzo, Davide and Morozov, Alexander},
  issn         = {0031-9007},
  language     = {eng},
  month        = {07},
  number       = {2},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Role of Correlations in the Collective Behavior of Microswimmer Suspensions},
  url          = {http://dx.doi.org/},
  volume       = {119},
  year         = {2017},
}