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Spanwise variations in nominally two-dimensional rough-wall boundary layers

Spanwise variations in nominally two-dimensional rough-wall boundary layers
Spanwise variations in nominally two-dimensional rough-wall boundary layers
Laboratory experiments have been conducted in two separate boundary layer facilities to investigate steady spanwise variations in mean velocity discovered during studies of developing flows over regular arrays of large roughness elements. Regular spanwise variation was found with a steady wavelength, moderated by the growing boundary layer, which was an integer multiple of the repeating unit of roughness. Amplitude variations greater than ±5% in the mean were found over the roughness and greater than ±10% in turbulence quantities. Due to the dominating nature of this phenomena throughout the layer, care should be taken in undertaking local measurements aimed at identifying flow variations caused by roughness heterogeneity.
0723-4864
311-320
Reynolds, R.T.
b0f0f6ab-c6f2-4952-99e0-347d2ff9deb6
Hayden, P.
4824ded5-2d41-4df4-a715-7ff9dec849d7
Castro, I.P.
66e6330d-d93a-439a-a69b-e061e660de61
Robins, A.G.
e522c3af-6028-4e6a-b34c-146487afc10d
Reynolds, R.T.
b0f0f6ab-c6f2-4952-99e0-347d2ff9deb6
Hayden, P.
4824ded5-2d41-4df4-a715-7ff9dec849d7
Castro, I.P.
66e6330d-d93a-439a-a69b-e061e660de61
Robins, A.G.
e522c3af-6028-4e6a-b34c-146487afc10d

Reynolds, R.T., Hayden, P., Castro, I.P. and Robins, A.G. (2007) Spanwise variations in nominally two-dimensional rough-wall boundary layers. Experiments in Fluids, 42 (2), 311-320. (doi:10.1007/s00348-006-0243-5).

Record type: Article

Abstract

Laboratory experiments have been conducted in two separate boundary layer facilities to investigate steady spanwise variations in mean velocity discovered during studies of developing flows over regular arrays of large roughness elements. Regular spanwise variation was found with a steady wavelength, moderated by the growing boundary layer, which was an integer multiple of the repeating unit of roughness. Amplitude variations greater than ±5% in the mean were found over the roughness and greater than ±10% in turbulence quantities. Due to the dominating nature of this phenomena throughout the layer, care should be taken in undertaking local measurements aimed at identifying flow variations caused by roughness heterogeneity.

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Published date: 2007

Identifiers

Local EPrints ID: 44198
URI: http://eprints.soton.ac.uk/id/eprint/44198
ISSN: 0723-4864
PURE UUID: 6d22f5b6-e3d2-4fad-a7ff-032ba74a3cbe

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Date deposited: 19 Feb 2007
Last modified: 16 Dec 2019 19:19

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Contributors

Author: R.T. Reynolds
Author: P. Hayden
Author: I.P. Castro
Author: A.G. Robins

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