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Reynolds number effect on the response of a rough wall turbulent boundary layer to local wall suction

Published online by Cambridge University Press:  12 April 2021

F. Ghanadi Open the ORCID record for F. Ghanadi [Opens in a new window]  and
L. Djenidi Open the ORCID record for L. Djenidi [Opens in a new window]
F. Ghanadi*
Affiliation:
Mechanical Engineering, University of Newcastle, Newcastle, NSW2308, Australia
L. Djenidi
Affiliation:
Mechanical Engineering, University of Newcastle, Newcastle, NSW2308, Australia
*
†Email address for correspondence: farzin.ghanadi@newcastle.edu.au
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Abstract

The combined effect of Reynolds number ($Re$) and localised wall suction applied through a porous strip on a fully rough wall turbulent boundary layer (TBL) is investigated using hot-wire anemometry. The measurements show that the response of the TBL to suction is modulated by the ratio $U_s/U_\tau$, where $U_s$ and $U_\tau$ are the suction and friction velocities, respectively. For example the suction impact on the mean velocity and the turbulence intensity profiles, which is felt across the boundary layer, decreases as $U_s/U_\tau$ decreases. Interestingly, the velocity spectra contour maps reveal that suction reduces the energy at all scales of motion across the boundary layer. Further, measurements of the velocity skewness indicate that the TBL undergoes a structural change when the ratio $U_s/U_\tau$ is relatively important. However, the measurements also reveal that TBL does not show a relaminarisation behaviour as it can be observed in a smooth wall TBL with similar localised wall suction. This lack of relaminarisation is due to the development of a growing internal boundary layer which evolves on a rough surface within the existing TBL.

JFM classification

Turbulent Flows: Turbulent boundary layers Boundary Layers: Boundary layer control
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 916 , 10 June 2021 , A25
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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