Swarm behavior of self-propelled rods and swimming flagella

Abstract

Systems of self-propelled particles are known for their tendency to aggregate and to display swarm behavior. We investigate two model systems, self-propelled rods interacting via volume exclusion, and sinusoidally-beating flagella embedded in a fluid with hydrodynamic interactions. In the flagella system, beating frequencies are Gaussian distributed with a non-zero average. These systems are studied by Brownian-dynamics simulations and by mesoscale hydrodynamics simulations, respectively. The clustering behavior is analyzed as the particle density and the environmental or internal noise are varied. By distinguishing three types of cluster-size probability density functions, we obtain a phase diagram of different swarm behaviors. The properties of clusters, such as their configuration, lifetime and average size are analyzed. We find that the swarm behavior of the two systems, characterized by several effective power laws, is very similar. However, a more careful analysis reveals several differences. Clusters of self-propelled rods form due to partially blocked forward motion, and are therefore typically wedge-shaped. At higher rod density and low noise, a giant mobile cluster appears, in which most rods are mostly oriented towards the center. In contrast, flagella become hydrodynamically synchronized and attract each other; their clusters are therefore more elongated. Furthermore, the lifetime of flagella clusters decays more quickly with cluster size than of rod clusters.

References in corpus (21)

• Novel type of phase transition in a system of self-driven particles
• The hydrodynamics of swimming microorganisms
• Hydrodynamic fluctuations and instabilities in ordered suspensions of self-propelled particles
• Onset of collective and cohesive motion
• Long-lived Giant Number Fluctuations in a Swarming Granular Nematic
• Collective motion of self-propelled particles interacting without cohesion
• Phase transition in the collective migration of tissue cells: experiment and model
• Non-equilibrium clustering of self-propelled rods
• Swarming and swirling in self-propelled polar granular rods
• Large-scale collective properties of self-propelled rods
• Hydrodynamic equations for self-propelled particles: microscopic derivation and stability analysis
• Active nematics on a substrate: giant number fluctuations and long-time tails
• Enhanced diffusion and ordering of self-propelled rods
• Transport coefficients of a mesoscopic fluid dynamics model
• Hydrodynamics of self-propelled hard rods
• Aggregation of self-propelled colloidal rods near confining walls
• Phase transitions in systems of self-propelled agents and related network models
• Cooperation of Sperm in Two Dimensions: Synchronization, Attraction and Aggregation through Hydrodynamic Interactions
• Self-Propelled Rods near Surfaces
• A mean-field theory for self-propelled particles interacting by velocity alignment mechanisms
• Hydrodynamic phase-locking of swimming microorganisms

Cited by in corpus (77)

• Physics of Microswimmers - Single Particle Motion and Collective Behavior
• Athermal Phase Separation of Self-Propelled Particles with no Alignment
• Active Brownian Particles. From Individual to Collective Stochastic Dynamics
• Emergent behavior in active colloids
• Collective motion and nonequilibrium cluster formation in colonies of gliding bacteria
• Tuned, driven, and active soft matter
• Pattern formation in self-propelled particles with density-dependent motility
• Crystallization in a dense suspension of self-propelled particles
• Dynamics of Self-Propelled Particles Under Strong Confinement
• Cooperative Motion of Active Brownian Spheres in Three-Dimensional Dense Suspensions
• Spontaneous velocity alignment in Motility-induced Phase Separation
• Self-propelled Worm-like Filaments: Spontaneous Spiral Formation, Structure, and Dynamics
• Spontaneous Segregation of Self-Propelled Particles with Different Motilities
• Transport powered by bacterial turbulence
• Clustering of microswimmers: Interplay of shape and hydrodynamics
• Long-range Ordering of Vibrated Polar Disks
• Emergent states in dense systems of active rods: from swarming to turbulence
• Motility-induced phase separation and coarsening in active matter
• Collective behavior of penetrable self-propelled rods in two dimensions
• Modeling a spheroidal microswimmer and cooperative swimming in thin films
• Dynamics and efficiency of a self-propelled, diffusiophoretic swimmer
• Collective Dynamics of Self-propelled Semiflexible Filaments
• Crystallization of self-propelled hard-discs : a new scenario
• Lattice Boltzmann Methods and Active Fluids
• Derivation of a hydrodynamic theory for mesoscale dynamics in microswimmer suspensions
• Clustering and phase separation of circle swimmers dispersed in a monolayer
• Nonlinear, electrocatalytic swimming in the presence of salt
• Motility-sorting of self-propelled particles in micro-channels
• A kinetic model and scaling properties for non-equilibrium clustering of self-propelled particles
• Phase behavior of active Brownian disks, spheres, and dumbbells
• Mechanism for collective cell alignment in Myxococcus xanthus bacteria
• From flagellar undulations to collective motion: predicting the dynamics of sperm suspensions
• Polar Patterns in Active Fluids
• Dynamics of a homogeneous active dumbbell system
• Methods for suspensions of passive and active filaments
• Simulating squirmers with multiparticle collision dynamics
• Active dumbbells: dynamics and morphology in the coexisting region
• Current fluctuations of interacting active Brownian particles
• Phase Separation and Emergent Structures in an Active Nematic
• Active Brownian Rods
• Structure and Dynamics of a Phase-Separating Active Colloidal Fluid
• Differently Shaped Hard Body Colloids in Confinement: From passive to active particles
• Flow and rheology of frictional elongated grains
• Gliding filament system giving both orientational order and clusters in collective motion
• Sorting of chiral active particles driven by rotary obstacles
• From scalar to polar active matter: Connecting simulations with mean-field theory
• Self-Organized Vortices of Circling Self-Propelled Particles and Curved Active Flagella
• Introduction to colloidal dispersions in external fields
• Hydrodynamic interactions between nearby slender filaments
• Morphological and dynamical properties of semiflexible filaments driven by molecular motors
• Collective behavior of self-propelled rods with quorum sensing
• Isotropic-nematic transition of self-propelled rods in three dimensions
• Hysteresis, reentrance, and glassy dynamics in systems of self-propelled rods
• Non-equilibrium structure and dynamics in a microscopic model of thin film active gels
• The pairwise hydrodynamic interactions of synchronized spermatozoa
• Mixing and de-mixing of model microswimmers in bi-motility mixtures
• Reaction processes among self-propelled particles
• Heating leads to liquid-crystal and crystalline order in a two-temperature active fluid of rods
• Bridging the Gap Between Collective Motility and Epithelial-Mesenchymal Transitions through the Active Finite Voronoi Model
• Mechanisms of carrier transport induced by a microswimmer bath
• Multi-Ciliated Microswimmers -- Metachronal Coordination and Helical Swimming
• Phase separation of active Brownian particles on curved surfaces
• Simulation of microswimmer hydrodynamics with multiparticle collision dynamics
• Obstruction enhances the diffusivity of self-propelled rod-like particles
• Clustering and anisotropic correlated percolation in polar flocks
• Collective Vortical Motion and Vorticity Reversals of Self-Propelled Particles on Circularly Patterned Substrates
• Particle-based simulations of self-motile suspensions
• Collective synchronization of undulatory movement through contact
• Microphase separation in active filament systems is maintained by cyclic dynamics of cluster size and order
• Formation of Spiral-Coils among Self-Propelled Chains
• Vicsek Model Meets DBSCAN: Cluster Phases in the Vicsek Model
• Lateral contact yields longitudinal cohesion in active undulatory systems
• Interacting passive advective scalars in an active medium
• Bidirectional Zigzag Growth from Clusters of Active Colloidal Shakers
• Transverse Self-Propulsion Enhances the Aggregation of Active Dumbbells
• Shape anisotropy governs organization of active rods: Swarming, turbulence, flocking, and jamming
• Dynamics of a simple model microswimmer in an anisotropic fluid: implications for alignment behavior and active transport in a nematic liquid crystal