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Drag reduction in turbulent channel flow laden with finite-size oblate spheroids

Published online by Cambridge University Press:  28 February 2017

M. Niazi Ardekani Open the ORCID record for M. Niazi Ardekani [Opens in a new window] ,
P. Costa ,
W.-P. Breugem ,
F. Picano  and
L. Brandt
M. Niazi Ardekani*
Affiliation:
Linné Flow Centre and Swedish e-Science Research Centre (SeRC), KTH Mechanics, SE-100 44 Stockholm, Sweden
P. Costa
Affiliation:
Laboratory for Aero and Hydrodynamics, Delft University of Technology, 2628 CA Delft, The Netherlands
W.-P. Breugem
Affiliation:
Laboratory for Aero and Hydrodynamics, Delft University of Technology, 2628 CA Delft, The Netherlands
F. Picano
Affiliation:
Department of Industrial Engineering, University of Padova, Via Venezia 1, 35131 Padua, Italy
L. Brandt
Affiliation:
Linné Flow Centre and Swedish e-Science Research Centre (SeRC), KTH Mechanics, SE-100 44 Stockholm, Sweden
*
†Email address for correspondence: mehd@mech.kth.se
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Abstract

We study suspensions of oblate rigid particles in a viscous fluid for different values of the particle volume fractions. Direct numerical simulations have been performed using a direct-forcing immersed boundary method to account for the dispersed phase, combined with a soft-sphere collision model and lubrication corrections for short-range particle–particle and particle–wall interactions. With respect to the single-phase flow, we show that in flows laden with oblate spheroids the drag is reduced and the turbulent fluctuations attenuated. In particular, the turbulence activity decreases to lower values than those obtained by accounting only for the effective suspension viscosity. To explain the observed drag reduction, we consider the particle dynamics and the interactions of the particles with the turbulent velocity field and show that the particle–wall layer, previously observed and found to be responsible for the increased dissipation in suspensions of spheres, disappears in the case of oblate particles. These rotate significantly slower than spheres near the wall and tend to stay with their major axes parallel to the wall, which leads to a decrease of the Reynolds stresses and turbulence production and so to the overall drag reduction.

JFM classification

Multiphase and Particle-laden Flows: Multiphase and Particle-laden Flows
Type
Papers
Information
Journal of Fluid Mechanics , Volume 816 , 10 April 2017 , pp. 43 - 70
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Copyright
© 2017 Cambridge University Press 

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