Simulations of Brownian tracer transport in squirmer suspensions

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Title: Simulations of Brownian tracer transport in squirmer suspensions
Author(s): Delmotte, B
Keaveny, EE
Climent, E
Plouraboué, F
Item Type: Journal Article
Abstract: In addition to enabling movement towards environments with favourable living conditions, swim- ming by microorganisms has also been linked to enhanced mixing and improved nutrient uptake by their populations. Experimental studies have shown that Brownian tracer particles exhibit enhanced diffusion due to the swimmers, while theoretical models have linked this increase in diffusion to the flows generated by the swimming microorganisms, as well as collisions with the swimmers. In this study, we perform detailed simulations based on the force-coupling method and its recent extensions to the swimming and Brownian particles to examine tracer displacements and effective tracer diffusivity in squirmer suspensions. By iso- lating effects such as hydrodynamic or steric interactions, we provide physical insight into experimental measurements of the tracer displacement distribution. In addition, we extend results to the semi-dilute regime where the swimmer-swimmer interactions affect tracer transport and the effective tracer diffusiv- ity no longer scales linearly with the swimmer volume fraction. Tracer dispersion - Squirmers - Active suspensions - Simulations
Date of Acceptance: 15-Feb-2018
ISSN: 0272-4960
Publisher: Oxford University Press (OUP)
Journal / Book Title: IMA Journal of Applied Mathematics
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/P013651/1
Keywords: physics.flu-dyn
0102 Applied Mathematics
Applied Mathematics
Publication Status: Accepted
Appears in Collections:Mathematics
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences

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