Unsteady turbulent properties in negative waves in open channels

Reichstetter, Martina and Chanson, Hubert (2013) Unsteady turbulent properties in negative waves in open channels. European Journal of Mechanics B/Fluids, 37 1-9. doi:10.1016/j.euromechflu.2012.07.003

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Author Reichstetter, Martina
Chanson, Hubert
Title Unsteady turbulent properties in negative waves in open channels
Journal name European Journal of Mechanics B/Fluids   Check publisher's open access policy
ISSN 0997-7546
1873-7390
Publication date 2013-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.euromechflu.2012.07.003
Open Access Status File (Author Post-print)
Volume 37
Start page 1
End page 9
Total pages 9
Place of publication Moulineaux, Cedex, France
Publisher Elsevier Masson
Collection year 2013
Language eng
Formatted abstract
In an open channel, a sudden drop in free-surface elevation is associated with the development of a negative wave. While some simple analytical solution is widely described in textbooks, little research was conducted to date on the unsteady turbulence properties beneath negative waves. A series of new physical experiments were conducted in a rectangular channel. The unsteady free-surface profile and turbulence characteristics were measured in a negative wave propagating upstream against an initially steady flow using non-intrusive acoustic displacement meters, video imagery and acoustic Doppler velocimetry (ADV). For one set of flow conditions, the experiments were repeated 25 times at two longitudinal locations and four vertical elevations to yield ensemble-averaged data. The wave leading edge propagated upstream with a speed which was a function of time and space. The velocity data showed that the upstream propagation of the negative wave was linked with a gentle drop in water elevation associated with an acceleration of the flow, while some increased turbulence occurred beneath the wave associated with large velocity fluctuations and large Reynolds stress components. The velocity fluctuations and turbulent stresses were significantly larger than in the initially steady flow and in the final flow motion.
Keyword Acoustic Doppler velocimetry
Ensemble average (EA)
Negative waves
Open channel flows
Turbulent velocity measurements
Unsteady turbulence
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2013 Collection
 
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Created: Mon, 05 Nov 2012, 12:50:16 EST by Hubert Chanson on behalf of School of Civil Engineering