- Title
- Reynolds number effect on the response of a rough wall turbulent boundary layer to local wall suction
- Creator
- Ghanadi, F.; Djenidi, L.
- Relation
- ARC.190102751.DP190102751 http://purl.org/au-research/grants/arc/DP190102751
- Relation
- Journal of Fluid Mechanics Vol. 916, Issue 12 April 2021, no. A25
- Publisher Link
- http://dx.doi.org/10.1017/jfm.2021.215
- Publisher
- Cambridge University Press
- Resource Type
- journal article
- Date
- 2021
- Description
- 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 Us/Uτ, where Us and Uτ 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 Us/Uτ 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 Us/Uτ 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.
- Subject
- turbulent boundary layers; boundary layer control; Reynolds number; wall suction
- Identifier
- http://hdl.handle.net/1959.13/1435146
- Identifier
- uon:39624
- Identifier
- ISSN:0022-1120
- Language
- eng
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