Auteur Oscar Castro-Orgaz
Documents disponibles écrits par cet auteur (15)
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Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur |The dynamics of free surface flow is characterised by the so-called Froude number F, whose value F = 1 separates subcritical (F < 1) and supercritical (F > 1) flows. The transition from F < 1 to F > 1 is smooth and continuous, as observed in[...]
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Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur |Flows from mild to steep slopes are relevant in hydraulic engineering relating to chute spillways and slope changes in irrigation networks. These flows are associated with transitional flow from sub- to supercritical conditions, smooth curviline[...]
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Curvilinear flow over round-crested weirs is a problem of both theoretical and practical significance because of its presence in overflow structures used in dam engineering, and its connection to the critical flow principle of hydraulics. The Ja[...]
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Oscar Castro-Orgaz, Auteur ; Juan Vicente Giraldez, Auteur ; Jose Luis Ayuso, Auteur |The definitions of the critical flow condition in open channel hydraulics, based on the momentum and the energy equations, differ from each other if non-hydrostatic pressure and non-uniform velocity distributions are considered. The concept of m[...]
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Oscar Castro-Orgaz, Auteur ; Juan Vicente Giraldez, Auteur ; Jose Luis Ayuso, Auteur |A new extended Bernoulli energy equation, which is valid for moderately curved channel flows, is presented. From this generalized energy equation, a higher order critical flow condition valid for curved streamline flow was developed. As a practi[...]
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Venturi flumes are of practical significance for flow measurement structures in open channels. The curvilinear flow in these structures has not yet received a systematic attention. As a result, the current engineering practice is based on the hy[...]
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Oscar Castro-Orgaz, Auteur |A turbulent boundary layer develops if water flows down a chute. This region is referred to as the developing zone, where a turbulent boundary layer coexists with a irrotational flow above it. No computational approach is currently available for[...]
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Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur |Joseph Valentin Boussinesq (1842–1929) is known in open channel hydraulics for the outstanding theory bearing his name to deal with streamlined-flows. However, the original developments did not last over time and remain lost in his original writ[...]
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Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur |Near-critical flows in rivers and natural streams usually present a wavelike undular free surface, associated with dune-type bed-forms. The formation of this particular bed geometry is related to the shear stress acting on the river bed. The bou[...]
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Oscar Castro-Orgaz, Auteur ; Subhasish Dey, Auteur |The one-dimensional (1D) momentum equation for free surface flow over curved boundaries has so far been traditionally developed integrating the Reynolds equations across the flow section in a boundary-fitted system of coordinates, such as flows [...]
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Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur |Spatially-varied open channel flows with a streamwise discharge variation occur in the side-weir, side-channel and bottom outlet. The governing equations were formulated in the 1970s by Yen and Wenzel. However, no attempts were made to provide c[...]
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Oscar Castro-Orgaz, Auteur |Steady free-surface flow in open channels may be analysed by the reduction of the two-dimensional (2D) potential flow problem to a quasi-2D potential flow approach by inclusion of streamline curvature and inclination effects following Fawer's th[...]
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Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur |Turbulent discontinuous open-channel flow appears in practice due to separation zones. The current practice overlooks the separation bubble by neglecting its velocity and by assuming static pressure on the active main stream. Based on the pionee[...]
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Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur |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 an[...]
