Turbulent fluctuations in hydraulic jumps: a physical study

Wang, H. and Chanson, H. (2014). Turbulent fluctuations in hydraulic jumps: a physical study. In: Hubert Chanson and Luke Toombes, Hydraulic structures and society - Engineering challenges and extremes. 5th IAHR International Symposium on Hydraulic Structures, Brisbane, Australia, (1-8). 25-27 June 2014. doi:10.14264/uql.2014.15

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Author Wang, H.
Chanson, H.
Title of paper Turbulent fluctuations in hydraulic jumps: a physical study
Conference name 5th IAHR International Symposium on Hydraulic Structures
Conference location Brisbane, Australia
Conference dates 25-27 June 2014
Proceedings title Hydraulic structures and society - Engineering challenges and extremes
Journal name ISHS 2014 - Hydraulic Structures and Society - Engineering Challenges and Extremes: Proceedings of the 5th IAHR International Symposium on Hydraulic Structures
Place of Publication Brisbane, Australia
Publisher The University of Queensland
Publication Year 2014
Year available 2014
Sub-type Fully published paper
DOI 10.14264/uql.2014.15
Open Access Status DOI
ISBN 9781742721156
Editor Hubert Chanson
Luke Toombes
Start page 1
End page 8
Total pages 8
Collection year 2015
Language eng
Abstract/Summary In an open channel, the transformation from a supercritical flow into a subcritical flow is a rapidly varied flow with large turbulent fluctuations, intense air entrainment and substantial energy dissipation: i.e., a hydraulic jump. New experiments were conducted for a wide range of Froude numbers (3.8 < Fr1 < 8.5) at relatively large Reynolds numbers (2.1×104 < Re < 1.6×105) to quantify the turbulent fluctuations. The time-averaged free-surface profile presented some self-similar profile. The longitudinal movements of the jump were observed and both fast and very slow fluctuations were documented for all Froude numbers. The air-water flow measurements quantified the intense aeration of the roller. Overall the present findings demonstrated the close interactions between the roller turbulence and free-surface fluctuations. Future investigations should be carried out over long durations to account for the very slow fluctuations in jump position.
Keyword Hydraulic jumps
Turbulent fluctuations
Physical modelling
Air-water flows
Jump toe oscillations
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Mon, 12 May 2014, 15:50:26 EST by Anthony Yeates on behalf of Scholarly Communication and Digitisation Service