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Issue 39, 2019
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Particle-resolved lattice Boltzmann simulations of 3-dimensional active turbulence

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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 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.

Graphical abstract: Particle-resolved lattice Boltzmann simulations of 3-dimensional active turbulence

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Publication details

The article was received on 16 Apr 2019, accepted on 31 Jul 2019 and first published on 02 Aug 2019


Article type: Paper
DOI: 10.1039/C9SM00774A
Soft Matter, 2019,15, 7747-7756
  • Open access: Creative Commons BY license
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    Particle-resolved lattice Boltzmann simulations of 3-dimensional active turbulence

    D. Bárdfalvy, H. Nordanger, C. Nardini, A. Morozov and J. Stenhammar, Soft Matter, 2019, 15, 7747
    DOI: 10.1039/C9SM00774A

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