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Journal articles
Role of Correlations in the Collective Behavior of Microswimmer Suspensions
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 asymmetry between pusher and puller swimmers below the transition to turbulence.
Cited literature [51 references]
https://hal-cea.archives-ouvertes.fr/cea-01687396
Contributor : Dominique Girard <>
Submitted on : Thursday, January 18, 2018 - 2:26:11 PM
Last modification on : Monday, February 10, 2020 - 6:14:06 PM
Document(s) archivé(s) le : Wednesday, May 23, 2018 - 10:06:59 PM
Contributor : Dominique Girard <>
Submitted on : Thursday, January 18, 2018 - 2:26:11 PM
Last modification on : Monday, February 10, 2020 - 6:14:06 PM
Document(s) archivé(s) le : Wednesday, May 23, 2018 - 10:06:59 PM
File
PhysRevLett.119.028005.pdf
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