Dynamics of confined suspensions of swimming particles

Abstract

Low Reynolds number direct simulations of large populations of hydrodynamically interacting swimming particles confined between planar walls are performed. The results of simulations are compared with a theory that describes dilute suspensions of swimmers. The theory yields scalings with concentration for diffusivities and velocity fluctuations as well as a prediction of the fluid velocity spatial autocorrelation function. Even for uncorrelated swimmers, the theory predicts anticorrelations between nearby fluid elements that correspond to vortex-like swirling motions in the fluid with length scale set by the size of a swimmer and the slit height. Very similar results arise from the full simulations indicating either that correlated motion of the swimmers is not significant at the concentrations considered or that the fluid phase autocorrelation is not a sensitive measure of the correlated motion. This result is in stark contrast with results from unconfined systems, for which the fluid autocorrelation captures large-scale collective fluid structures. The additional length scale (screening length) introduced by the confinement seems to prevent these large-scale structures from forming.

J. Phys.: Cond. Mat., to appear

References in corpus (6)

• Novel type of phase transition in a system of self-driven particles
• Hydrodynamic attraction of swimming microorganisms by surfaces
• Hydrodynamics of self-propelled hard rods
• Diffusion and spatial correlations in suspensions of swimming particles
• Expressions for forces and torques in molecular simulations using rigid bodies
• The collective dynamics of self-propelled particles

Cited by in corpus (30)

• Active Brownian Particles. From Individual to Collective Stochastic Dynamics
• Meso-scale turbulence in living fluids
• Fluid dynamics and noise in bacterial cell-cell and cell-surface scattering
• Hydrodynamics of self-propulsion near a boundary: predictions and accuracy of far-field approximations
• Emergent behavior in active colloids
• Long-range Ordering of Vibrated Polar Disks
• Hydrodynamic suppression of phase separation in active suspensions
• Transport of a dilute active suspension in pressure-driven channel flow
• Particle diffusion in active fluids is non-monotonic in size
• Scattering of biflagellate microswimmers from surfaces
• Derivation of a hydrodynamic theory for mesoscale dynamics in microswimmer suspensions
• A Drop of Active Matter
• Swimming in Complex Fluids
• Bidirectional Sorting of Flocking Particles in the Presence of Asymmetric Barriers
• Brownian Dynamics of Confined Suspensions of Active Microrollers
• Confinement-induced Self-Pumping in 3D Active Fluids
• Simulating squirmers with multiparticle collision dynamics
• Activity-induced clustering in model dumbbell swimmers: The role of hydrodynamic interactions
• Heterogeneous bacterial swarms with mixed lengths
• Getting drowned in a swirl: deformable bead-spring model microswimmers in external flow fields
• Microorganism Billiards
• Collective motion in a sheet of microswimmers
• Swimming suppresses correlations in dilute suspensions of pusher microorganisms
• Population splitting of rodlike swimmers in Couette flow
• Nucleation-induced transition to collective motion in active systems
• Hydrodynamic collective effects of active proteins in biological membranes
• Nanoconfined catalytic Ångström-size motors
• Micro-swimmer collective dynamics in Brinkman flows
• A simple micro-swimmer model inspired by the general equation for nonequilibrium reversible-irreversible coupling
• Micro-swimmer locomotion and hydrodynamics in Brinkman Flows