Collective behaviour of self-propelling particles with conservative kinematic constraints
In this thesis I considered the dynamics of self-propelling particles (SPP). Flocking of living organisms like birds, fishes, ants, bacteria etc. is an area where the theory of the collective…
Hydrodynamic theory of flocking at a solid-liquid interface: Long-range order and giant number fluctuations
- PhysicsPhysical Review E
We construct the hydrodynamic theory of coherent collective motion (“flocking”) at a solidliquid interface. The polar order parameter and concentration of a collection of “active” (selfpropelled)…
Instabilities, pattern formation and mixing in active suspensions
Suspensions of self-propelled particles, such as swimming micro-organisms, are known to undergo complex dynamics as a result of hydrodynamic interactions. To elucidate these dynamics, a kinetic…
Statistical mechanics and hydrodynamics of bacterial suspensions
- Biology, EngineeringProceedings of the National Academy of Sciences
This work derives a continuum description of a suspension of active organisms that incorporates fluid-mediated, long-range hydrodynamic interactions among the swimmers, and demonstrates that hydrod dynamic interactions provide a simple, generic origin for several nonequilibrium phenomena predicted or observed in the literature.
boltzmann-ginzburg-landau approach to simple models of active matter
Collective motion is observed in many different biological systems like bird flocks or fish schools. In these systems, collective motion may arise without any leader or external force, and is only…
Liquid Crystalline Blue Phases and Swimmer Hydrodynamics
Soft condensed matter is concerned with the wide variety of materials, ranging from polymers to foams, that are neither crystalline, nor gaseous, but lie somewhere in between. In this thesis, we…
Minimal continuum theories of structure formation in dense active fluids
Self-sustained dynamical phases of living matter can exhibit remarkable similarities over a wide range of scales, from mesoscopic vortex structures in microbial suspensions and motility assays of…
Hydrodynamics of soft active matter
This review summarizes theoretical progress in the field of active matter, placing it in the context of recent experiments, and highlights the experimental relevance of various semimicroscopic derivations of the continuum theory for describing bacterial swarms and suspensions, the cytoskeleton of living cells, and vibrated granular material.
Emergent vortices in populations of colloidal rollers
- Physics, BiologyNature communications
It is demonstrated that the emergent-vortex structure lives on the verge of a phase separation, and a continuum theory is established to lay out a strong foundation for the description of vortical collective motion in a broad class of motile populations constrained by geometrical boundaries.
SHOWING 1-10 OF 125 REFERENCES
Spontaneously ordered motion of self-propelled particles
We study a biologically inspired, inherently non-equilibrium model consisting of self-propelled particles. In the model, particles move on a plane with a velocity of constant magnitude; they locally…
Flocks, herds, and schools: A quantitative theory of flocking
We present a quantitative continuum theory of ``flocking'': the collective coherent motion of large numbers of self-propelled organisms. In agreement with everyday experience, our model predicts the…
Nonequilibrium Steady States of Driven Periodic Media
We study a periodic medium driven over a random or periodic substrate. Our work is based on nonequilibrium continuum hydrodynamic equations of motion, which we derive microscopically. We argue that…
Self-organization in systems of self-propelled particles.
- PhysicsPhysical review. E, Statistical, nonlinear, and soft matter physics
A continuum version of the discrete model consisting of self-propelled particles that obey simple interaction rules is developed and it is demonstrated that the agreement between the discrete and the continuum model is excellent.
Statistical hydrodynamics of ordered suspensions of self-propelled particles: waves, giant number fluctuations and instabilities
Hydrodynamic Phenomena in Suspensions of Swimming Microorganisms
- Environmental Science
Vast numbers of microorganisms are suspended in temperate aqueous environments. Oceans and rivers, puddles and droplets, the fluid interiors of animals, all host an array of splendidly varied…
Hydrodynamic fluctuations and instabilities in ordered suspensions of self-propelled particles.
- PhysicsPhysical review letters
The hydrodynamic equations for suspensions of self-propelled particles (SPPs) with spontaneous orientational order are constructed, and a number of striking, testable predictions are made.
SCREENED AND UNSCREENED PHASES IN SEDIMENTING SUSPENSIONS
A coarse-grained stochastic hydrodynamical description of velocity and concentration fluctuations in steadily sedimenting suspensions is constructed and analyzed using self-consistent and…