SHEN, Zaiyi; WÜRGER, Aloïs; LINTUVUORI, Juho S

doi:10.1140/epje/i2018-11649-0

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SHEN, Zaiyi
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

WÜRGER, Aloïs
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

LINTUVUORI, Juho S
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Article de revue

Ce document a été publié dans

European Physical Journal E: Soft matter and biological physics. 2018-03, vol. 41, n° 3, p. 39 (1-9)

EDP Sciences: EPJ

Résumé en anglais

Using lattice Boltzmann simulations we study the hydrodynamics of an active spherical particle near a no-slip wall. We develop a computational model for an active Janus particle, by considering different and independent mobilities on the two hemispheres and compare the behaviour to a standard squirmer model. We show that the topology of the far-field hydrodynamic nature of the active Janus particle is similar to the standard squirmer model, but in the near-field the hydrodynamics differ. In order to study how the near-field effects affect the interaction between the particle and a flat wall, we compare the behaviour of a Janus swimmer and a squirmer near a no-slip surface via extensive numerical simulations. Our results show generally a good agreement between these two models, but they reveal some key differences especially with low magnitudes of the squirming parameter β. Notably the affinity of the particles to be trapped at a surface is increased for the active Janus particles when compared to standard squirmers. Finally we find that when the particle is trapped on the surface, the velocity parallel to the surface exceeds the bulk swimming speed and scales linearly with |β|.< Réduire

DOI

http://dx.doi.org/10.1140/epje/i2018-11649-0

Project ANR

Contrôle quantique d'un gaz de molécules polaires ultra-froides - ANR-13-IS04-0004
Initiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003

Origine

Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798