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Turbulence structure near a sharp density interface

Hannoun, Imad A. and Fernando, Harindra J. S. and List, E. John (1988) Turbulence structure near a sharp density interface. Journal of Fluid Mechanics, 189 . pp. 189-209. ISSN 0022-1120. doi:10.1017/S0022112088000965.

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The effects of a sharp density interface and a rigid flat plate on oscillating-grid induced shear-free turbulence were investigated experimentally. A two-component laser-Doppler velocimeter was used to measure turbulence intensities in and above the density interface (with matched refractive indices) and near the rigid flat plate. Energy spectra, velocity correlations, and kinetic energy fluxes were also measured. Amplification of the horizontal turbulent velocity, coupled with a sharp reduction in the vertical turbulent velocity, was observed near both the density interface and the flat plate. These findings are in agreement with some previous results pertaining to shear-free turbulence near rigid walls (Hunt & Graham 1978) and near density interfaces (Long 1978). The results imply that, near the density interface, the turbulent kinetic energy in the vertical velocity component is only a small fraction of the total turbulent kinetic energy and indicate that the effects of the anisotropy created by the density interface or the flat plate are confined to the large turbulence scales.

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Additional Information:© 1988 Cambridge University Press. (Received 31 October 1986 and in revised form 13 August 1987) The authors would like to thank Dr James Skjelbreia for help throughout this work and Dr D. Papantoniou for setting up the data acquisition system used in the concentration measurements. We would also like to thank Dr. P. Papanicolaou and the staff of the W. M. Keck Hydraulics Laboratory for their assistance in the construction of the equipment. The work was supported by the National Science Foundation Grant MSM 84-12641, A01. During part of this study, H.J.S.P. was supported by NSF Grant MSM 8504909.
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NSFMSM84-12641, A01
Record Number:CaltechAUTHORS:20160418-151749264
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Official Citation:Imad A. Hannoun, Harindra J. S. Fernando and E. John List (1988). Turbulence structure near a sharp density interface. Journal of Fluid Mechanics, 189, pp 189-209 doi:10.1017/S0022112088000965
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66256
Deposited By: George Porter
Deposited On:18 Apr 2016 22:29
Last Modified:10 Nov 2021 23:55

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