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Turbulence measurements in spatially-varied flow with increasing discharge / Mehdi (Hajian) Khiadani in Journal of hydraulic research, Vol. 50 N° 4 (Juillet/Août 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 4 (Juillet/Août 2012) . - pp. 418-426 Titre : Turbulence measurements in spatially-varied flow with increasing discharge Type de document : texte imprimé Auteurs : Mehdi (Hajian) Khiadani, Auteur ; Simon Beecham, Auteur ; Jaya Kandasamy, Auteur Année de publication : 2012 Article en page(s) : pp. 418-426 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Reynolds  shear  stress  Spatially-varied  flow  Turbulence  Turbulent  kinetic  energy  Velocity  measurement Résumé : This experimental study explores the distribution of Reynolds shear stresses and turbulence intensities for a flume receiving lateral inflow via a set of vertical nozzles. The data set allows for developing turbulence models to describe a wider range of spatially-varied flow conditions. The turbulent flow structures are detailed both in the near-field close to where the flow enters the flume, and in the far-field. It was found that a lateral inflow increases the turbulence level, but it decreases in the transverse direction towards the side walls. As the lateral inflow rate increases, the turbulence parameters increase only slightly. The turbulence parameters also increase from the upstream end of the lateral inflow zone towards the downstream end. The turbulent kinetic energy (TKE) production was estimated. Small regions of negative TKE production exist, which are typically near the lateral inflow addition. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.696883 [article] Turbulence measurements in spatially-varied flow with increasing discharge [texte imprimé] / Mehdi (Hajian) Khiadani, Auteur ; Simon Beecham, Auteur ; Jaya Kandasamy, Auteur . - 2012 . - pp. 418-426. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 4 (Juillet/Août 2012) . - pp. 418-426 Mots-clés : Reynolds  shear  stress  Spatially-varied  flow  Turbulence  Turbulent  kinetic  energy  Velocity  measurement Résumé : This experimental study explores the distribution of Reynolds shear stresses and turbulence intensities for a flume receiving lateral inflow via a set of vertical nozzles. The data set allows for developing turbulence models to describe a wider range of spatially-varied flow conditions. The turbulent flow structures are detailed both in the near-field close to where the flow enters the flume, and in the far-field. It was found that a lateral inflow increases the turbulence level, but it decreases in the transverse direction towards the side walls. As the lateral inflow rate increases, the turbulence parameters increase only slightly. The turbulence parameters also increase from the upstream end of the lateral inflow zone towards the downstream end. The turbulent kinetic energy (TKE) production was estimated. Small regions of negative TKE production exist, which are typically near the lateral inflow addition. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.696883