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Turbulent boundary layer response to the introduction of stable stratification

Published online by Cambridge University Press:  13 December 2016

Tyler Van Buren ,
Owen Williams Open the ORCID record for Owen Williams [Opens in a new window]  and
Alexander J. Smits
Tyler Van Buren*
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
Owen Williams
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
Alexander J. Smits
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
*
†Email address for correspondence: [email protected]
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Abstract

The response of an initially neutral rough-wall turbulent boundary layer to a change in wall temperature is investigated experimentally. The change causes a localized peak in stable stratification that diffuses and moves away from the wall with downstream distance. The streamwise and wall-normal components of turbulent velocity fluctuations are damped at similar rates, even though the stratification only directly impacts the wall-normal component. The Reynolds shear profiles reveal the growth of an internal layer that scales approximately with the bulk Brunt–Väisälä frequency.

JFM classification

Geophysical and Geological Flows: Geophysical and Geological Flows Turbulent Flows: Stratified turbulence Turbulent Flows: Turbulent boundary layers
Type
Papers
Information
Journal of Fluid Mechanics , Volume 811 , 25 January 2017 , pp. 569 - 581
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Copyright
© 2016 Cambridge University Press 

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