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Issue 38, 2016
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Hydrodynamic oscillations and variable swimming speed in squirmers close to repulsive walls

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Abstract

We present a lattice Boltzmann study of the hydrodynamics of a fully resolved squirmer, confined in a slab of fluid between two no-slip walls. We show that the coupling between hydrodynamics and short-range repulsive interactions between the swimmer and the surface can lead to hydrodynamic trapping of both pushers and pullers at the wall, and to hydrodynamic oscillations in the case of a pusher. We further show that a pusher moves significantly faster when close to a surface than in the bulk, whereas a puller undergoes a transition between fast motion and a dynamical standstill according to the range of the repulsive interaction. Our results critically require near-field hydrodynamics and demonstrate that far-field hydrodynamics is insufficient to give even a qualitatively correct account of swimmer behaviour near walls. Finally our simulations suggest that it should be possible to control the density and speed of squirmers at a surface by tuning the range of steric and electrostatic swimmer–wall interactions.

Graphical abstract: Hydrodynamic oscillations and variable swimming speed in squirmers close to repulsive walls

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Publication details

The article was received on 14 Jun 2016, accepted on 19 Aug 2016 and first published on 19 Aug 2016


Article type: Paper
DOI: 10.1039/C6SM01353H
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Soft Matter, 2016,12, 7959-7968

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    Hydrodynamic oscillations and variable swimming speed in squirmers close to repulsive walls

    J. S. Lintuvuori, A. T. Brown, K. Stratford and D. Marenduzzo, Soft Matter, 2016, 12, 7959
    DOI: 10.1039/C6SM01353H

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