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Deformability of discs in turbulence

Published online by Cambridge University Press:  17 December 2021

Gautier Verhille Open the ORCID record for Gautier Verhille [Opens in a new window]
Gautier Verhille*
Affiliation:
Aix-Marseille Univ., CNRS, Centrale Marseille, IRPHE, 13013 Marseille, France
*
†Email address for correspondence: gautier.verhille@irphe.univ-mrs.fr
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Abstract

The aim of this study is to investigate experimentally the transition from a rigid regime to a deformed regime for flexible discs freely advected in turbulent flows. For a given disc, the amplitude of the deformation is expected to increase when its bending modulus decreases or when the turbulent kinetic energy increases. To quantify this qualitative argument, experiments are performed where the deformation of flexible discs is measured using three cameras. The amplitude of the deformation has been characterised by the eigenvalues of the moment of inertia tensor. Experimental results exhibit a transition from a rigid regime to a deformed regime that depends on the size, the density and the flexibility of the disc and the turbulent kinetic energy. The modelling of this transition is a generalisation and an extension of the previous models used to characterise the deformation of flexible fibres in turbulent flows.

JFM classification

Multiphase and Particle-laden Flows: Particle/fluid flow Turbulent Flows: Homogeneous turbulence
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 933 , 25 February 2022 , A3
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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References

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