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

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

2010-03-09

arxiv.org/abs/1003.1996v2

Phys. Rev. Lett. 104, 258101 (2010)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevLett.104.258101

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.

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