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Transition to turbulence in an oscillatory flow over a rough wall

Published online by Cambridge University Press:  29 February 2016

Marco Mazzuoli  and
Giovanna Vittori
Marco Mazzuoli
Affiliation:
Department of Civil, Chemical and Environmental Engineering, University of Genoa, Via Montallegro 1, 16145 Genova, Italy Institute for Hydromechanics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
Giovanna Vittori*
Affiliation:
Department of Civil, Chemical and Environmental Engineering, University of Genoa, Via Montallegro 1, 16145 Genova, Italy
*
†Email address for correspondence: [email protected]
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Abstract

A study of the oscillatory incompressible flow close to a wall covered with fixed rigid spheres is carried out by numerical means to provide information on unsteady flows over a rough wall. The simulations are carried out for two bottom configurations, characterized by different values of the diameter of the spheres and different values of the Reynolds number for a total of 10 cases. Three different flow regimes are identified as functions of both the Reynolds number and the diameter of the spheres. The force exerted by the flow on the spheres is discussed also in relation to the different flow regimes.

JFM classification

Boundary Layers: Boundary Layers Instability: Transition to turbulence
Type
Papers
Information
Journal of Fluid Mechanics , Volume 792 , 10 April 2016 , pp. 67 - 97
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Copyright
© 2016 Cambridge University Press 

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Mazzuoli et al. supplementary movie

Isosurfaces of λ2 (λ2=-0.11). Rδ =500. Configuration B (D=2.32)

Download Mazzuoli et al. supplementary movie(Video)
Video 36.7 MB

Mazzuoli et al. supplementary movie

Isosurfaces of λ2 (λ2=-0.11). Rδ =500. Configuration B (D=2.32)

Download Mazzuoli et al. supplementary movie(Video)
Video 10.3 MB