Run-and-tumble particles with hydrodynamics: sedimentation, trapping and upstream swimming

We simulate by lattice Boltzmann the nonequilibrium steady states of run-and-tumble particles (inspired by a minimal model of bacteria), interacting by far-field hydrodynamics, subject to confinement. Under gravity, hydrodynamic interactions barely perturb the steady state found without them, but fo...

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Bibliographic Details
Published in:arXiv.org 2010-06
Main Authors: Nash, R W, Adhikari, R, Tailleur, J, Cates, M E
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Computer simulation
Confinement
Fluid flow
Fluid mechanics
Hydrodynamics
Laminar flow
Sedimentation
Self-assembly
Steady state
Swimming
Upstream
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Summary:We simulate by lattice Boltzmann the nonequilibrium steady states of run-and-tumble particles (inspired by a minimal model of bacteria), interacting by far-field hydrodynamics, subject to confinement. Under gravity, hydrodynamic interactions barely perturb the steady state found without them, but for particles in a harmonic trap such a state is quite changed if the run length is larger than the confinement length: a self-assembled pump is formed. Particles likewise confined in a narrow channel show a generic upstream flux in Poiseuille flow: chiral swimming is not required.
ISSN:2331-8422
DOI:10.48550/arxiv.1003.1996