%0 Journal Article
%T Run-and-tumble particles with hydrodynamics: sedimentation, trapping and upstream swimming
%A R. W. Nash
%A R. Adhikari
%A J. Tailleur
%A M. E. Cates
%J Quantitative Biology
%D 2010
%I arXiv
%R 10.1103/PhysRevLett.104.258101
%X 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.
%U http://arxiv.org/abs/1003.1996v2