Turbulence structure of non-uniform rough open channel flow

Priscilla Williams; Vesselina Roussinova; Ram Balachandar

doi:10.1051/e3sconf/20184005039

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Turbulence structure of non-uniform rough open channel flow

Conference proceeding

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Peer reviewed

Turbulence structure of non-uniform rough open channel flow

Priscilla Williams, Vesselina Roussinova and Ram Balachandar

Ninth International Conference on Fluvial Hydraulics (River Flow 2018), Vol.40, p.5039

E3S Web of Conferences

01/01/2018

DOI: 10.1051/e3sconf/20184005039

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Abstract

This paper focuses on the turbulence structure in a non-uniform, gradually varied, sub-critical open channel flow (OCF) on a rough bed. The flow field is analysed under accelerating, near-uniform and decelerating conditions. Information for the flow and turbulence parameters was obtained at multiple sections and planes using two different techniques: two component laser Doppler velocimetry (LDV) and particle image velocimetry (Ply). Different outer region velocity scaling methods were explored for evaluation of the local friction velocity. Analysis of the mean velocity profiles showed that the overlap layer exists for all flow cases. The outer layer of the decelerated velocity profile was strongly affected by the pressure gradient, where a large wake was noted. Due to the prevailing nature of the experimental setup it was found that the time-averaged flow quantities do not attained equilibrium conditions and the flow is spatially heterogeneous. The roughness generally increases the friction velocity and its effect was stronger than the effect of the pressure gradient. It was found that for the decelerated flow section over a rough bed, the mean flow and turbulence intensities were affected throughout the flow depth. The flow features presented in this study can be used to develop a model for simulating flow over a block ramp. The effect of the non-uniformity and roughness on turbulence intensities and Reynolds shear stresses was further investigated.

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Details

Title: Subtitle: Turbulence structure of non-uniform rough open channel flow
Creators: Priscilla Williams - University of Windsor
Vesselina Roussinova - University of Windsor
Ram Balachandar - University of Windsor
Contributors: A Paquier (Editor)
N Riviere (Editor)
Resource Type: Conference proceeding
Publication Details: Ninth International Conference on Fluvial Hydraulics (River Flow 2018), Vol.40, p.5039
Series: E3S Web of Conferences
DOI: 10.1051/e3sconf/20184005039
ISSN: 2267-1242
eISSN: 2267-1242
Publisher: E D P Sciences
Number of pages: 8
Language: English
Date published: 01/01/2018
Academic Unit: Civil and Environmental Engineering
Record Identifier: 9984446279302771

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