2026-04-17T04:26:36Zhttps://recercat.cat/oai/requestoai:recercat.cat:2445/1938672025-12-04T20:47:11Zcom_2072_1057col_2072_478822col_2072_478914col_2072_478917
RECERCAT
author
Scagliarini, Andrea
author
Pagonabarraga Mora, Ignacio
2023-02-20T16:05:06Z2023-02-20T16:05:06Z2022-06-062023-02-20T16:05:06Z
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.
cc-by (c) Scagliarini, Andrea et al., 2022 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess
Hidrodinà mica
Microorganismes
Matèria condensada tova
Hydrodynamics
Microorganisms
Soft condensed matter
Hydrodynamic and geometric effects in the sedimentation of model run-and-tumble microswimmers
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion