[article] 
inJournal of hydraulic research > Vol. 49 N° 6 (Novembre/Décembre 2011) . - pp. 775-783

Titre :	Vorticity equation for the streamline and the velocity profile
Type de document :	texte imprimé
Auteurs :	Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur
Année de publication :	2012
Article en page(s) :	pp. 775-783
Note générale :	Hydraulique
Langues :	Anglais (eng)
Mots-clés :	Boundary layer Free overfall Transitional flow Undular hydraulic jump Vorticity
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 :	Water flow over short hydraulic transitions is usually modelled by the irrotational flow theory, for which the energy head remains constant over the entire flow domain. Velocity and pressure distributions are then obtained based on the stream and potential functions of the flow net. However, experimental evidence may dictate non-uniform energy profiles resulting either from vorticity, viscous effects, or both. For rapidly-varied flows, Hunter Rouse (1906–1996) proposed in the early 1930s the inviscid Euler flow equations. Most of the current curvilinear flow models, however, resort to irrotational flow. In this work, a generalized curvilinear method for real fluid flow is proposed. Based on the streamline vorticity equation, a practical approach is presented for inviscid, rotational flow. The model is verified by data pertaining to the free overfall and further tested with data on viscous flow in undular jumps, thereby resulting in good agreement.
DEWEY :	627
ISSN :	0022-1686
En ligne :	http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.624687

[article] Vorticity equation for the streamline and the velocity profile [texte imprimé] / Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur . - 2012 . - pp. 775-783.
Hydraulique
Langues : Anglais (eng)
in Journal of hydraulic research > Vol. 49 N° 6 (Novembre/Décembre 2011) . - pp. 775-783

Mots-clés :	Boundary layer Free overfall Transitional flow Undular hydraulic jump Vorticity
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 :	Water flow over short hydraulic transitions is usually modelled by the irrotational flow theory, for which the energy head remains constant over the entire flow domain. Velocity and pressure distributions are then obtained based on the stream and potential functions of the flow net. However, experimental evidence may dictate non-uniform energy profiles resulting either from vorticity, viscous effects, or both. For rapidly-varied flows, Hunter Rouse (1906–1996) proposed in the early 1930s the inviscid Euler flow equations. Most of the current curvilinear flow models, however, resort to irrotational flow. In this work, a generalized curvilinear method for real fluid flow is proposed. Based on the streamline vorticity equation, a practical approach is presented for inviscid, rotational flow. The model is verified by data pertaining to the free overfall and further tested with data on viscous flow in undular jumps, thereby resulting in good agreement.
DEWEY :	627
ISSN :	0022-1686
En ligne :	http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.624687