Particle-resolved lattice Boltzmann simulations of 3-dimensional active turbulence
(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
- Bárdfalvy, Dóra LU ; Nordanger, Henrik LU ; Nardini, Cesare ; Morozov, Alexander and Stenhammar, Joakim LU
- organization
- publishing date
- 2019
- 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
-
- scopus:85073125093
- pmid:31393504
- ISSN
- 1744-6848
- DOI
- 10.1039/c9sm00774a
- project
- Large-scale Lattice-Boltzmann simulations of tracer diffusion in colloidal suspensions out of equilibrium
- language
- English
- LU publication?
- yes
- id
- 6e77d896-c072-4752-aed5-7ea610e5938f
- date added to LUP
- 2019-10-21 15:10:30
- date last changed
- 2024-04-16 22:43:24
@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}},
}