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

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 $N=3\times 10^6$) 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.

References in corpus (23)

• Active Particles in Complex and Crowded Environments
• The hydrodynamics of swimming microorganisms
• Meso-scale turbulence in living fluids
• Hydrodynamic fluctuations and instabilities in ordered suspensions of self-propelled particles
• Statistical mechanics for natural flocks of birds
• Fluid dynamics and noise in bacterial cell-cell and cell-surface scattering
• Fluid dynamics of bacterial turbulence
• Diffusive transport without detailed balance in motile bacteria: Does microbiology need statistical physics?
• Diffusion and spatial correlations in suspensions of swimming particles
• Velocity Correlations in an Active Nematic
• Clustering of microswimmers: Interplay of shape and hydrodynamics
• Run-and-tumble particles with hydrodynamics: sedimentation, trapping and upstream swimming
• Enhanced diffusion of nonswimmers in a three-dimensional bath of motile bacteria
• Induced Diffusion of Tracers in a Bacterial Suspension: Theory and Experiments
• Modeling a spheroidal microswimmer and cooperative swimming in thin films
• Spontaneous aggregation and global polar ordering in squirmer suspensions
• The role of correlations in the collective behaviour of microswimmer suspensions
• Lévy Fluctuations and Tracer Diffusion in Dilute Suspensions of Algae and Bacteria
• Singular forces and point-like colloids in lattice Boltzmann hydrodynamics
• Hydrodynamic interactions in dense active suspensions: from polar order to dynamical clusters
• Binary pusher-puller mixtures of active microswimmers and their collective behavior
• Particle-scale statistical theory for hydrodynamically induced polar ordering in microswimmer suspensions
• Lattice-Boltzmann Simulations of Microswimmer-Tracer Interactions

Cited by in corpus (16)

• Active Turbulence
• Active turbulence in microswimmer suspensions -- the role of active hydrodynamic stress and volume exclusion
• Swimming in Complex Fluids
• Symmetric mixtures of pusher and puller microswimmers behave as noninteracting suspensions
• Collective motion in a sheet of microswimmers
• Swimming suppresses correlations in dilute suspensions of pusher microorganisms
• Scaling regimes of active turbulence with external dissipation
• Active turbulence and spontaneous phase separation in inhomogeneous extensile active gels
• Anisotropic diffusion of ellipsoidal tracers in microswimmer suspensions
• Collective behavior of squirmers in thin films
• Alignment-Induced Self-Organization of Autonomously Steering Microswimmers: Turbulence, Vortices, and Jets
• Enhanced velocity fluctuations in interacting swimmer suspensions
• Irreversibility and Chaos in Active Particle Suspensions
• Topological signatures of collective dynamics and turbulent-like energy cascades in apolar active granular
• Self-organised structures in mixed active-passive suspensions due to hydrodynamic interactions
• Pseudo-giant number fluctuations and nematic order in microswimmer suspensions