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Study of a rough-wall turbulent boundary layer under pressure gradient

Published online by Cambridge University Press:  15 March 2022

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:
School of Engineering, University of Newcastle, CallaghanNSW2308, Australia
L. Djenidi
Affiliation:
School of Engineering, University of Newcastle, CallaghanNSW2308, Australia
*
†Email address for correspondence: [email protected]
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Abstract

The behaviour of a fully rough-wall turbulent boundary layer subjected to different pressure gradients is investigated for different Reynolds numbers using hot-wire measurements. Mean velocity and velocity root-mean-square measurements indicate that the boundary layer remains in a self-preserving state regardless of the pressure gradient. However, different pressure gradients lead to different self-preservation states, as suggested by the lack of collapse of the velocity profile between the pressure gradient cases. The results also indicate that the roughness effect is more important than the pressure gradient; particularly, the closer the wall, the more dominant the roughness effect over the pressure gradient effect on the boundary layer. Finally, both spectral and proper orthogonal decomposition analyses applied to the hot-wire measurements indicate that the pressure gradient impacts predominantly the large-scale motion.

JFM classification

Turbulent Flows: Turbulent boundary layers Boundary Layers: Boundary layer structure
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 938 , 10 May 2022 , A17
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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References

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