Two-dimensional free surface flow numerical model for vertical slot fishways

Numerical results of a vertical slot fishway study are presented. The Saint-Venant equations are solved using TELEMAC-2D. Turbulence modelling uses the classical two equations k-ϵ closure model. A comparison with velocity measurements performed at the Laboratoire d'Etudes Aérodynamiques of Univ...

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Bibliographic Details
Published in:Journal of hydraulic research 2010-04, Vol.48 (2), p.141-151
Main Authors: Chorda, Jacques, Maubourguet, Marie Madeleine, Roux, Hélène, Larinier, Michel, Tarrade, Laurent, David, Laurent
Format: Article
Language:English
Subjects:
2D free surface modelling
Computational fluid dynamics
Earth sciences
Earth, ocean, space
energy dissipation
Engineering Sciences
Exact sciences and technology
finite-element model
Fluid flow
Fluid mechanics
Fluids mechanics
Hydrology. Hydrogeology
Mathematical analysis
Mathematical models
Mechanics
Modelling
Physics
Turbulence
turbulence model
Turbulent flow
Velocity measurement
vertical slot fishway
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Summary:Numerical results of a vertical slot fishway study are presented. The Saint-Venant equations are solved using TELEMAC-2D. Turbulence modelling uses the classical two equations k-ϵ closure model. A comparison with velocity measurements performed at the Laboratoire d'Etudes Aérodynamiques of University of Poitiers, France, using particle image velocimetry and acoustic Doppler velocimetry permitted to validate numerical results. Turbulence modelling is required not only to have a fish-friendly flow but, more remarkably, by the fact that taking a constant eddy viscosity model gives incorrect mean flow patterns. Three longitudinal slopes were tested. The validity of the k-ϵ closure model is discussed. Special attention was paid to the calculated turbulent kinetic energy and the energy dissipation rate. This last parameter is of great interest because its spatial distribution significantly affects the progress relative to fish passage efficiency.
ISSN:0022-1686
1814-2079
DOI:10.1080/00221681003703956