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Issue 46, 2019
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Sedimenting pairs of elastic microfilaments

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Abstract

The dynamics of two identical elastic filaments settling under gravity in a viscous fluid in the low Reynolds number regime is investigated numerically. A large family of initial configurations symmetric with respect to a vertical plane is considered, as well as their non-symmetric perturbations. The behaviour of the filaments is primarily governed by the elasto-gravitational number, which depends on the filament's length and flexibility, and the strength of the external force. Flexible filaments usually converge toward horizontal and parallel orientation. We explain this phenomenon and show that it occurs also for curved rigid particles of similar shapes. Once aligned, the two fibres either converge toward a stationary, flexibility-dependent distance, or tend to collide or continuously repel each other. Rigid and straight rods perform periodic motions while settling down. Apart from very stiff particles, the dynamics is robust to non-symmetric perturbations.

Graphical abstract: Sedimenting pairs of elastic microfilaments

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Supplementary files

Article information


Submitted
08 Jul 2019
Accepted
26 Sep 2019
First published
11 Oct 2019

This article is Open Access

Soft Matter, 2019,15, 9405-9417
Article type
Paper

Sedimenting pairs of elastic microfilaments

M. Bukowicki and M. L. Ekiel-Jeżewska, Soft Matter, 2019, 15, 9405
DOI: 10.1039/C9SM01373C

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    [Original citation] - Published by The Royal Society of Chemistry.

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