Peculiar mean velocity profiles within a porous bed of an open channel
Peculiar mean velocity profiles within a porous bed of an open channel
We present the velocity profile measured within a porous bed below rough turbulent open channel flow. Mean streamwise velocity has a minimum in the top pore, just below the bed surface, and then increases towards a constant value in the deeper pores. We argue that the velocity minimum in the top pore is due to enhanced turbulence generated within the external flow. This produces a flow regime similar to rough turbulent pipe flow, with very efficient momentum extraction. In the deeper pores turbulence intensities are damped so that momentum extraction is less efficient, allowing higher mean velocities to develop
098109-[4pp]
Pokrajac, D.
bf6480dd-6965-46f1-880b-8290c86f6965
Manes, C.
7d9d5123-4d1b-4760-beff-d82fe0bd0acf
McEwan, I.
c768d60c-6fe7-4b35-89a2-105cbf0a19b5
26 September 2007
Pokrajac, D.
bf6480dd-6965-46f1-880b-8290c86f6965
Manes, C.
7d9d5123-4d1b-4760-beff-d82fe0bd0acf
McEwan, I.
c768d60c-6fe7-4b35-89a2-105cbf0a19b5
Pokrajac, D., Manes, C. and McEwan, I.
(2007)
Peculiar mean velocity profiles within a porous bed of an open channel.
Physics of Fluids, 19 (9), .
(doi:10.1063/1.2780193).
Abstract
We present the velocity profile measured within a porous bed below rough turbulent open channel flow. Mean streamwise velocity has a minimum in the top pore, just below the bed surface, and then increases towards a constant value in the deeper pores. We argue that the velocity minimum in the top pore is due to enhanced turbulence generated within the external flow. This produces a flow regime similar to rough turbulent pipe flow, with very efficient momentum extraction. In the deeper pores turbulence intensities are damped so that momentum extraction is less efficient, allowing higher mean velocities to develop
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Pokrajac_et_al_2007b
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Published date: 26 September 2007
Organisations:
Energy & Climate Change Group
Identifiers
Local EPrints ID: 204095
URI: http://eprints.soton.ac.uk/id/eprint/204095
ISSN: 1070-6631
PURE UUID: bb9630d3-6b59-4965-937e-a2d97917dd85
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Date deposited: 24 Nov 2011 11:21
Last modified: 14 Mar 2024 04:30
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Author:
D. Pokrajac
Author:
C. Manes
Author:
I. McEwan
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