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Interaction between a rough bed and an adjacent smooth bed in open-channel flow

Dupuis, Victor 1; Moulin, Frédéric Y.; Eiff, Olivier 1
1 Institut für Hydromechanik (IFH), Karlsruher Institut für Technologie (KIT)

Abstract:

Experiments are conducted in an open-channel flow where half of the section is smooth and the other half consists of an array of cubes, which are either submerged or emergent. A shear layer featuring large-scale Kelvin–Helmholtz structures develops between the two subsections. The flows are first analysed in the framework of the double-averaging method (averaging of the flow both in time and space). Double averaging could be performed thanks to an experimental set-up (three-dimensional, two-component telecentric scanning particle image velocimetry) that allows to measure the velocity field in a large volume, including the interstices between the cubes. A momentum balance performed on the smooth subsection indicates that the loss of momentum towards the rough subsection has the same order of magnitude than the momentum loss through bed friction. This lateral momentum flux occurs nearly exclusively through turbulent shear stress, whereas secondary currents plays a minor role and dispersive shear stress is negligible. A pattern recognition technique is then applied to investigate statistically the large-scale Kelvin–Helmholtz structures that develop in the shear layer. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000162239
Veröffentlicht am 15.09.2023
Originalveröffentlichung
DOI: 10.1017/jfm.2023.581
Web of Science
Zitationen: 1
Dimensions
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hydromechanik (IFH)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 25.08.2023
Sprache Englisch
Identifikator ISSN: 0022-1120, 1469-7645, 1750-6859
KITopen-ID: 1000162239
Erschienen in Journal of Fluid Mechanics
Verlag Cambridge University Press (CUP)
Band 969
Seiten Art.-Nr.: A32
Vorab online veröffentlicht am 22.08.2023
Schlagwörter shear layer turbulence, channel flow, wakes
Nachgewiesen in Web of Science
Dimensions
Scopus
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