Run-and-tumble particles with hydrodynamics: sedimentation, trapping and upstream swimming
Statistical Mechanics
2010-07-01 v2 Soft Condensed Matter
Other Quantitative Biology
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.
Keywords
Cite
@article{arxiv.1003.1996,
title = {Run-and-tumble particles with hydrodynamics: sedimentation, trapping and upstream swimming},
author = {R. W. Nash and R. Adhikari and J. Tailleur and M. E. Cates},
journal= {arXiv preprint arXiv:1003.1996},
year = {2010}
}