IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 5: Environmental Hydraulics and Hydrology : A cfd model to evaluate the effect of sluiceway deflectors on the hydrodynamics and tdg field in the...
A cfd model to evaluate the effect of sluiceway deflectors on the hydrodynamics and tdg field in the tailrace of hells canyon dam
Author : A. Arenas Amado1, M. Politano1 and K. Anderson2
A computational fluid dynamics (CFD) study was performed to evaluate the effect of installing spillway deflectors in the tailrace of Hells Canyon Dam (HCD). Free surface simulations were carried out to predict spillway jet regimes with and without deflectors. Model results were compared against deflector performance curves from a 1:48 scale model. Through a Lagrangian particle tracking technique, accelerations, strain rate and pressure change rate were calculated to estimate the possibility of fish injury due to the inclusion of the deflectors. According to the model results, changes on the flow field caused by deflectors do not pose a major threat to fish survival. A two-phase flow model for prediction of Total Dissolved Gas (TDG) was also validated to evaluate possible gas bubble disease in fish. The model takes into account the attenuation of the turbulence at the free-surface and the effect of the bubbles on the turbulence. Bubble diameter changes due to dissolution and pressure. Predicted TDG values matched field measurements with a deviation of +/- 3%. Future work will use the TDG model to analyze changes in TDG due to the inclusion of deflectors.
File Size : 2,600,521 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 5: Environmental Hydraulics and Hydrology
Date Published : 01/07/2011
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