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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/5455

Title: Particle image velocimetry measurements and numerical modeling of a saline density current
Authors: Gerber, G
Diedericks, G
Basson, GR
Keywords: Density current
Flow measurements
Navier-Stokes equations
Reynolds stress
Turbulent diffusion
Numerical models
Issue Date: Mar-2011
Publisher: American Society of Civil Engineers
Citation: Gerber, G, Diedericks, G and Basson, GR. 2011. Particle image velocimetry measurements and numerical modeling of a saline density current. Journal of Hydraulic Engineering, Vol 137(3), pp 333–342
Series/Report no.: Workflow request;5985
Abstract: Particle image velocimetry scalar measurements were carried out on the body of a stably stratified density current with an inlet Reynolds number of 2,300 and bulk Richardson number of 0.1. These measurements allowed the mass and momentum transport between the current and the less dense ambient fluid to be investigated. Reynolds stress, Reynolds flux, and shear production of turbulent kinetic-energy profiles revealed local maxima at the bed, as well as at the interface with the ambient fluid. Profiles of excess density variance and buoyancy production of turbulent kinetic energy revealed only local maxima at the interface with the ambient. These maxima decreased downstream as the stable density gradient reduced the turbulent intensities, until turbulence collapsed. A two-dimensional, unsteady, Reynolds-averaged Navier-Stokes (2DV-URANS) simulation was also performed on this density current. Good agreement was found between the modeled and measured normalized mean flow profiles. A comparison was also made between the measured and modeled outer flow scales of the density current.
Description: Copyright: 2011 American Society of Civil Engineers. This is an ABSTRACT ONLY
URI: http://cedb.asce.org/cgi/WWWdisplay.cgi?277277
ISSN: 0733-9429
Appears in Collections:Coastal and marine systems
Advanced mathematical modelling and simulation
General science, engineering & technology

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