Three-dimensional modelling of flow in sharp open-channel bends with vanes / Sang Soo Han in Journal of hydraulic research, Vol. 49 N° 1 (Janvier/Fevrier 2011)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 49 N° 1 (Janvier/Fevrier 2011) . - pp. 64-72 Titre : Three-dimensional modelling of flow in sharp open-channel bends with vanes Type de document : texte imprimé Auteurs : Sang Soo Han, Auteur ; Biron, Pascale M., Auteur ; Amruthur S. Ramamurthy, Auteur Année de publication : 2011 Article en page(s) : pp. 64-72 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Flow separation Numerical simulation Open-channel bend Reynolds stress model Secondary flow Turbulence Water surface Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Flow around a sharp open-channel bend is highly three-dimensional (3D) due to the combined effects of secondary flow, a large free surface variation and flow separation along the inner wall. Continuous vanes often used in closed curved conduits to generate a more uniform downstream flow were tested in the open channel using a 3D finite-volume model with a Reynolds stress turbulence model and the volume of fluid method for free surface prediction. The velocity field, turbulent kinetic energy and the extent of the flow separation zone were successfully validated against laboratory measurements for the no-vane case. The 3D simulations for one-vane and three-vane configurations reveal that vertical vanes are effective to reduce the secondary flow intensity and flow separation along the inner wall. The energy loss for bends with vanes is further slightly reduced compared to the no-vane case. The three-vane configuration is particularly efficient at creating uniform downstream flow. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.informaworld.com/smpp/content~db=all~content=a933340662~frm=titlelink [article] Three-dimensional modelling of flow in sharp open-channel bends with vanes [texte imprimé] / Sang Soo Han, Auteur ; Biron, Pascale M., Auteur ; Amruthur S. Ramamurthy, Auteur . - 2011 . - pp. 64-72. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 1 (Janvier/Fevrier 2011) . - pp. 64-72 Mots-clés : Flow separation Numerical simulation Open-channel bend Reynolds stress model Secondary flow Turbulence Water surface Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Flow around a sharp open-channel bend is highly three-dimensional (3D) due to the combined effects of secondary flow, a large free surface variation and flow separation along the inner wall. Continuous vanes often used in closed curved conduits to generate a more uniform downstream flow were tested in the open channel using a 3D finite-volume model with a Reynolds stress turbulence model and the volume of fluid method for free surface prediction. The velocity field, turbulent kinetic energy and the extent of the flow separation zone were successfully validated against laboratory measurements for the no-vane case. The 3D simulations for one-vane and three-vane configurations reveal that vertical vanes are effective to reduce the secondary flow intensity and flow separation along the inner wall. The energy loss for bends with vanes is further slightly reduced compared to the no-vane case. The three-vane configuration is particularly efficient at creating uniform downstream flow. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.informaworld.com/smpp/content~db=all~content=a933340662~frm=titlelink

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