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On the scaling of turbulence in a high Reynolds number tidal flow

Published online by Cambridge University Press:  25 March 2021

I.A. Milne Open the ORCID record for I.A. Milne [Opens in a new window] ,
J.M.R. Graham Open the ORCID record for J.M.R. Graham [Opens in a new window]  and
D.S. Coles Open the ORCID record for D.S. Coles [Opens in a new window]
I.A. Milne*
Affiliation:
Oceans Graduate School, The University of Western Australia, Crawley6009, Australia
J.M.R. Graham
Affiliation:
Department of Aeronautics, Imperial College London, SW7 2AZ, UK
D.S. Coles
Affiliation:
School of Engineering, Computing and Mathematics, University of Plymouth, PlymouthPL4 8AA, UK SIMEC Atlantis Energy, EdinburghEH3 9QG, UK
*
†Email address for correspondence: ian.milne@uwa.edu.au
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Abstract

Data from an energetic tidal flow are used to investigate the appropriateness of the classical scaling of wall turbulence for very high Reynolds numbers and fully rough conditions. The boundary layer occupied the entire channel depth and the Reynolds numbers were several orders of magnitude larger than typically attained in the laboratory. Profiles of the mean velocity, turbulence quantities and spectra exhibit consistencies with the wall-similarity hypothesis and the attached-eddy model, as well as the universality of the near-wall turbulence structure for geophysical flows. The wall-normal velocity spectra and intensities near the free surface are also strongly attenuated at low wavenumbers, consistent with the constraints imposed by any boundary which may be approximated as a plane slip surface. The results can be used to inform the development of turbulence inflow models for assessing the dynamic loading on tidal turbines and the layout of tidal energy farms.

JFM classification

Geophysical and Geological Flows: Ocean processes Turbulent Flows: Turbulent boundary layers
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 915 , 25 May 2021 , A104
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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