Turbulence statistics in compound channels with deep and shallow overbank flows / Sibel Kara in Journal of hydraulic research, Vol. 50 N° 5 (Septembre/Octobre 2012)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 50 N° 5 (Septembre/Octobre 2012) . - pp. 482-493 Titre : Turbulence statistics in compound channels with deep and shallow overbank flows Type de document : texte imprimé Auteurs : Sibel Kara, Auteur ; Thorsten Stoesser, Auteur ; Terry W. Sturm, Auteur Année de publication : 2012 Article en page(s) : pp. 482-493 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Apparent shear stress Compound open channel flow Large eddy simulation Streamwise momentum balance Turbulence-driven secondary Résumé : The results of large eddy simulations (LESs) of turbulent flow in a compound open channel with deep and shallow flood plain depths are presented. These LESs are validated with experimental data, resulting in a good agreement between measured and calculated data. The floodplain-depth-to-main-channel-depth ratio is an important parameter affecting first- and second-order turbulence statistics. The streamwise momentum balance is analysed with respect to the momentum transfer at the interface between the main channel and the floodplain. Depth-averaging of the streamwise momentum equation reveals the dominance of turbulent shear stress terms in the main channel and of secondary currents in the floodplain. Comparisons of the LES results with an analytical solution of the depth-averaged streamwise momentum equation that demonstrate the importance of case-specific calibration of the parameters of the analytical solution. The turbulence anisotropy is quantified and its role in generating secondary currents is illustrated. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.724194 [article] Turbulence statistics in compound channels with deep and shallow overbank flows [texte imprimé] / Sibel Kara, Auteur ; Thorsten Stoesser, Auteur ; Terry W. Sturm, Auteur . - 2012 . - pp. 482-493. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 5 (Septembre/Octobre 2012) . - pp. 482-493 Mots-clés : Apparent shear stress Compound open channel flow Large eddy simulation Streamwise momentum balance Turbulence-driven secondary Résumé : The results of large eddy simulations (LESs) of turbulent flow in a compound open channel with deep and shallow flood plain depths are presented. These LESs are validated with experimental data, resulting in a good agreement between measured and calculated data. The floodplain-depth-to-main-channel-depth ratio is an important parameter affecting first- and second-order turbulence statistics. The streamwise momentum balance is analysed with respect to the momentum transfer at the interface between the main channel and the floodplain. Depth-averaging of the streamwise momentum equation reveals the dominance of turbulent shear stress terms in the main channel and of secondary currents in the floodplain. Comparisons of the LES results with an analytical solution of the depth-averaged streamwise momentum equation that demonstrate the importance of case-specific calibration of the parameters of the analytical solution. The turbulence anisotropy is quantified and its role in generating secondary currents is illustrated. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.724194

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