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Slipping motion of large neutrally buoyant particles in turbulence

Published online by Cambridge University Press:  15 October 2013

Mamadou Cisse ,
Holger Homann  and
Jérémie Bec
Mamadou Cisse
Affiliation:
Laboratoire Lagrange UMR 7293, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d’Azur, Bd. de l’Observatoire, 06300 Nice, France
Holger Homann
Affiliation:
Laboratoire Lagrange UMR 7293, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d’Azur, Bd. de l’Observatoire, 06300 Nice, France
Jérémie Bec*
Affiliation:
Laboratoire Lagrange UMR 7293, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d’Azur, Bd. de l’Observatoire, 06300 Nice, France
*
†Email address for correspondence: jeremie.bec@obs-nice.fr
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Abstract

Direct numerical simulations are used to investigate the individual dynamics of large spherical particles suspended in a developed homogeneous turbulent flow. A definition of the direction of the particle motion relative to the surrounding flow is introduced and used to construct the mean fluid velocity profile around the particle. This leads to an estimate of the particle slipping velocity and its associated Reynolds number. The flow modifications due to the particle are then studied. The particle is responsible for a shadowing effect that occurs in the wake up to distances of the order of its diameter: the particle calms turbulent fluctuations and reduces the energy dissipation rate compared to its average value in the bulk. Dimensional arguments are presented to draw an analogy between particle effects on turbulence and wall flows. Evidence is obtained for the presence of a logarithmic sublayer at distances between the thickness of the viscous boundary layer and the particle diameter ${D}_{p} $. Finally, asymptotic arguments are used to relate the viscous sublayer quantities to the particle size and the properties of the outer turbulence. It is shown in particular that the skin-friction Reynolds number behaves as $R{e}_{\tau } \propto {({D}_{p} / \eta )}^{4/ 3} $.

JFM classification

Boundary Layers: Boundary Layers Turbulent Flows: Turbulent Flows
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 735 , 25 November 2013 , R1
Copyright
©2013 Cambridge University Press 

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