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Particle-resolved lattice Boltzmann simulations of 3-dimensional active turbulence

Bárdfalvy, Dóra LU ; Nordanger, Henrik LU ; Nardini, Cesare ; Morozov, Alexander and Stenhammar, Joakim LU (2019) In Soft Matter 15(39). p.7747-7756
Abstract

Collective behaviour in suspensions of microswimmers is often dominated by the impact of long-ranged hydrodynamic interactions. These phenomena include active turbulence, where suspensions of pusher bacteria at sufficient densities exhibit large-scale, chaotic flows. To study this collective phenomenon, we use large-scale (up to N = 3 × 106) particle-resolved lattice Boltzmann simulations of model microswimmers described by extended stresslets. Such system sizes enable us to obtain quantitative information about both the transition to active turbulence and characteristic features of the turbulent state itself. In the dilute limit, we test analytical predictions for a number of static and dynamic properties against our simulation... (More)

Collective behaviour in suspensions of microswimmers is often dominated by the impact of long-ranged hydrodynamic interactions. These phenomena include active turbulence, where suspensions of pusher bacteria at sufficient densities exhibit large-scale, chaotic flows. To study this collective phenomenon, we use large-scale (up to N = 3 × 106) particle-resolved lattice Boltzmann simulations of model microswimmers described by extended stresslets. Such system sizes enable us to obtain quantitative information about both the transition to active turbulence and characteristic features of the turbulent state itself. In the dilute limit, we test analytical predictions for a number of static and dynamic properties against our simulation results. For higher swimmer densities, where swimmer-swimmer interactions become significant, we numerically show that the length- and timescales of the turbulent flows increase steeply near the predicted finite-system transition density.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
15
issue
39
pages
10 pages
publisher
Royal Society of Chemistry
external identifiers
  • pmid:31393504
  • scopus:85073125093
ISSN
1744-6848
DOI
10.1039/c9sm00774a
language
English
LU publication?
yes
id
6e77d896-c072-4752-aed5-7ea610e5938f
date added to LUP
2019-10-21 15:10:30
date last changed
2019-10-29 05:57:52
@article{6e77d896-c072-4752-aed5-7ea610e5938f,
  abstract     = {<p>Collective behaviour in suspensions of microswimmers is often dominated by the impact of long-ranged hydrodynamic interactions. These phenomena include active turbulence, where suspensions of pusher bacteria at sufficient densities exhibit large-scale, chaotic flows. To study this collective phenomenon, we use large-scale (up to N = 3 × 106) particle-resolved lattice Boltzmann simulations of model microswimmers described by extended stresslets. Such system sizes enable us to obtain quantitative information about both the transition to active turbulence and characteristic features of the turbulent state itself. In the dilute limit, we test analytical predictions for a number of static and dynamic properties against our simulation results. For higher swimmer densities, where swimmer-swimmer interactions become significant, we numerically show that the length- and timescales of the turbulent flows increase steeply near the predicted finite-system transition density.</p>},
  author       = {Bárdfalvy, Dóra and Nordanger, Henrik and Nardini, Cesare and Morozov, Alexander and Stenhammar, Joakim},
  issn         = {1744-6848},
  language     = {eng},
  number       = {39},
  pages        = {7747--7756},
  publisher    = {Royal Society of Chemistry},
  series       = {Soft Matter},
  title        = {Particle-resolved lattice Boltzmann simulations of 3-dimensional active turbulence},
  url          = {http://dx.doi.org/10.1039/c9sm00774a},
  doi          = {10.1039/c9sm00774a},
  volume       = {15},
  year         = {2019},
}