Quadrant analysis of persistent spatial velocity perturbations over square-bar roughness
Quadrant analysis of persistent spatial velocity perturbations over square-bar roughness
We explore a new application of the quadrant method in the context of the double-averaged Navier–Stokes equations for studying open channel flow near rough beds. Quadrant analysis is applied to spatial disturbances of time-averaged velocity components, using the experimental data from flow over two-dimensional regular transverse square-bar roughness. The spatial velocity disturbances change periodically performing a full cycle over a single roughness element, so that the quadrant diagrams are regular closed orbits. A colour code is used to produce a quadrant map of the flow cross-section, which reveals contributions from each quadrant to the time-averaged momentum transfer
413-423
Pokrajac, D.
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Campbell, L.
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Nikora, V.
eb1445fd-f8be-429c-af56-2d24d0b9ff7d
Manes, C.
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McEwan, I.
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23 January 2007
Pokrajac, D.
bf6480dd-6965-46f1-880b-8290c86f6965
Campbell, L.
55f0f877-c982-4898-b9c0-b03474d3656c
Nikora, V.
eb1445fd-f8be-429c-af56-2d24d0b9ff7d
Manes, C.
7d9d5123-4d1b-4760-beff-d82fe0bd0acf
McEwan, I.
c768d60c-6fe7-4b35-89a2-105cbf0a19b5
Pokrajac, D., Campbell, L., Nikora, V., Manes, C. and McEwan, I.
(2007)
Quadrant analysis of persistent spatial velocity perturbations over square-bar roughness.
Experiments in Fluids, 42 (3), .
(doi:10.1007/s00348-006-0248-0).
Abstract
We explore a new application of the quadrant method in the context of the double-averaged Navier–Stokes equations for studying open channel flow near rough beds. Quadrant analysis is applied to spatial disturbances of time-averaged velocity components, using the experimental data from flow over two-dimensional regular transverse square-bar roughness. The spatial velocity disturbances change periodically performing a full cycle over a single roughness element, so that the quadrant diagrams are regular closed orbits. A colour code is used to produce a quadrant map of the flow cross-section, which reveals contributions from each quadrant to the time-averaged momentum transfer
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Published date: 23 January 2007
Organisations:
Energy & Climate Change Group
Identifiers
Local EPrints ID: 204091
URI: http://eprints.soton.ac.uk/id/eprint/204091
ISSN: 0723-4864
PURE UUID: cdff2edb-9095-4394-b843-719639105307
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Date deposited: 24 Nov 2011 11:07
Last modified: 14 Mar 2024 04:30
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Contributors
Author:
D. Pokrajac
Author:
L. Campbell
Author:
V. Nikora
Author:
C. Manes
Author:
I. McEwan
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