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Title: Hydrodynamic and geometric effects in the sedimentation of model run-and-tumble microswimmers
Author: Scagliarini, Andrea
Pagonabarraga Mora, Ignacio
Keywords: Hidrodinàmica
Matèria condensada tova
Soft condensed matter
Issue Date: 6-Jun-2022
Publisher: Royal Society of Chemistry
Abstract: The sedimentation process in an active suspension is the result of the competition between gravity and the autonomous motion of particles. We carry out simulations of run-and-tumble squirmers that move in a fluid medium, focusing on the dependence of the non-equilibrium steady state on the swimming properties. We find that for large enough activity, the density profiles are no longer simple exponentials; we recover the numerical results through the introduction of a local effective temperature, suggesting that the breakdown of the Perrin-like exponential form is a collective effect due to fluid-mediated dynamic correlations among particles. We show that analogous concepts can also fit the case of active non-motile particles, for which we report the first study of this kind. Moreover, we provide evidence of scenarios where the solvent hydrodynamics induces non-local effects which require the full three-dimensional dynamics to be taken into account in order to understand sedimentation in active suspensions. Finally, analyzing the statistics of the orientations of microswimmers, the emergence of a height-dependent polar order in the system is discussed.
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It is part of: Soft Matter, 2022, vol. 18, p. 2407-2413
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ISSN: 1744-683X
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)
Articles publicats en revistes (Institut de Recerca en Sistemes Complexos (UBICS))

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