Run-and-Tumble Particles with Hydrodynamics: Sedimentation, Trapping, and Upstream Swimming

R. W. Nash, R. Adhikari, J. Tailleur, M. E. Cates

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number258101
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 22 Jun 2010


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