Spontaneous Circulation of Confined Active Suspensions

Abstract

Many active fluid systems encountered in biology are set in total geometric confinement. Cytoplasmic streaming in plant cells is a prominent and ubiquitous example, in which cargo-carrying molecular motors move along polymer filaments and generate coherent cell-scale flow. When filaments are not fixed to the cell periphery, a situation found both in vivo and in vitro, we observe that the basic dynamics of streaming are closely related to those of a non-motile stresslet suspension. Under this model, it is demonstrated that confinement makes possible a stable circulating state; a linear stability analysis reveals an activity threshold for spontaneous auto-circulation. Numerical analysis of the long-time behavior reveals a phenomenon akin to defect separation in nematic liquid crystals, and a high-activity bifurcation to an oscillatory regime.

5 pages, 4 figures

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Cited by in corpus (79)

• Spontaneous motion in hierarchically assembled active matter
• Emergence of macroscopic directed motion in populations of motile colloids
• Fluid dynamics of bacterial turbulence
• Confinement Stabilizes a Bacterial Suspension into a Spiral Vortex
• Fluid Flows Created by Swimming Bacteria Drive Self-Organization in Confined Suspensions
• Transition from turbulent to coherent flows in confined three-dimensional active fluids
• Directed collective motion of bacteria under channel confinement
• Velocity Correlations in an Active Nematic
• Ferromagnetic and antiferromagnetic order in bacterial vortex lattices
• Self-organized dynamics and the transition to turbulence of confined active nematics
• A physical perspective on cytoplasmic streaming (invited)
• Viscoelastic control of spatiotemporal order in bacterial active matter
• Spontaneous division and motility in active nematic droplets
• Hydrodynamics of confined active fluids
• Flow-induced phase separation of active particles is controlled by boundary conditions
• Vorticity, Defects and Correlations in Active Turbulence
• Hydrodynamic Collective Effects of Active Protein Machines in Solution and Lipid Bilayers
• Cytoplasmic Streaming in Plant Cells Emerges Naturally by Microfilament Self-Organization
• Minimal continuum theories of structure formation in dense active fluids
• Confined active nematic flow in cylindrical capillaries
• Active turbulence in active nematics
• Insensitivity of active nematic dynamics to topological constraints
• Capturing self-propelled particles in a moving microwedge
• Analytical structure, dynamics, and coarse-graining of a kinetic model of an active fluid
• Enhanced motility of a microswimmer in rigid and elastic confinement
• Spontaneous mirror-symmetry breaking induces inverse energy cascade in 3D active fluids
• Purely hydrodynamic origin for swarming of swimming particles
• Swimming trajectories of a three-sphere microswimmer near a wall
• Swirling Instability of the Microtubule Cytoskeleton
• Vesicle shape transformations driven by confined active filaments
• Confinement-induced Self-Pumping in 3D Active Fluids
• Vortex formation and dynamics of defects in shells of active nematics
• Oriented Active Solids
• Geometry-dependent viscosity reduction in sheared active fluids
• Actomyosin contractility rotates the cell nucleus
• Many-body microhydrodynamics of colloidal particles with active boundary layers
• Active polar fluid flow in finite droplets
• Disordered boundaries destroy bulk phase separation in scalar active matter
• Emergent probability fluxes in confined microbial navigation
• Domain walls in two-dimensional nematics confined in a small circular cavity
• Motility of active fluid drops on surfaces
• Instabilities, motion and deformation of active fluid droplets
• Velocity alignment leads to high persistence in confined cells
• Stochastic cycle selection in active flow networks
• Viscoelastic and elastomeric active matter: Linear instability and nonlinear dynamics
• Geometry-Induced Dynamics of Confined Chiral Active Matter
• Globally aligned states and hydrodynamic traffic jams in confined active suspensions
• Active matter invasion of a viscous fluid: unstable sheets and a no-flow theorem
• Lamellar ordering, droplet formation and phase inversion in exotic active emulsions
• Motility versus fluctuations in mixtures of self-propelled and passive agents
• Axisymmetric spheroidal squirmers and self-diffusiophoretic particles
• Defect Spirograph: Dynamical Behavior of Defects in Spatially Patterned Active Nematics
• Emergence of collective dynamical chirality for achiral active particles
• Collective motion in a sheet of microswimmers
• Defect Line Coarsening and Refinement in Active Nematics
• Helical Flow States in Active Nematics
• Spontaneous rotation of active droplets in two and three dimensions
• Viscous propulsion in active transversely-isotropic media
• Spontaneous flow instabilities of active polar fluids in three dimensions
• Tubulation and dispersion of oil by bacterial growth on droplets
• The hydrodynamics of slender swimmers near deformable interfaces
• A fast Chebyshev method for the Bingham closure with application to active nematic suspensions
• Stability of the interface of an isotropic active fluid
• The fluid dynamics of collective vortex structures of plant-animal worms
• Enhanced velocity fluctuations in interacting swimmer suspensions
• Enhancement of microorganism swimming speed in active matter
• Viscoelastic levitation
• Object Transport by a Confined Active Suspension
• Active particles confined in deformable droplets
• Stokes' second problem and reduction of inertia in active fluids
• Density-polarity coupling in confined active polar films: asters, spirals, and biphasic orientational phases
• Active patterning and asymmetric transport in a model actomyosin network
• Flow-induced nonequilibrium self-assembly in suspensions of stiff, apolar, active filaments
• Phase behaviour of active particles in block copolymer melts
• Persistent fluid flows defined by active matter boundaries
• Self-sustained oscillations of active viscoelastic matter
• Density fields for branching, stiff networks in rigid confining regions
• Physical entanglements mediate coherent motion of the active topological glass confined within a spherical cavity
• Flow coupling between active and passive fluids across water-oil interfaces