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  • Title: Run-and-tumble particles with hydrodynamics: sedimentation, trapping, and upstream swimming.
    Author: Nash RW, Adhikari R, Tailleur J, Cates ME.
    Journal: Phys Rev Lett; 2010 Jun 25; 104(25):258101. PubMed ID: 20867416.
    Abstract:
    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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