Study of the Free Surface Flow on an Ogee-Crested Fish Bypass

Turan, Cagri; Carrica, Pablo M.; Lyons, Troy; Hay, Duncan; Weber, Larry

doi:10.1061/(asce)0733-9429(2008)134:8(1172)

Cited by 10 publications

(7 citation statements)

References 3 publications

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“…In the field of hydraulic engineering, free surface models are not yet widely applied but steadily developed (Turan et al, 2008;Ferrari et al, 2009). However, direct simulation of individual bubbles in a spillway/tailrace environment is well beyond current computer capabilities.…”

Section: Tdgmentioning

confidence: 99%

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A multiphase model for the hydrodynamics and total dissolved gas in tailraces

Politano

Carrica

Weber

2009

International Journal of Multiphase Flow

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Section: Tdgmentioning

confidence: 99%

“…The VOF method has demonstrated to work very well for flow regime predictions (Turan et al, 2008). However, this method underpredicts the water entrainment observed in hydropower tailraces because it does not account for the reduction of the normal fluctuations at the free surface .…”

Section: Free Surface Modelingmentioning

confidence: 99%

A multiphase model for the hydrodynamics and total dissolved gas in tailraces

Politano

Carrica

Weber

2009

International Journal of Multiphase Flow

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“…In the group of studies that validate numerical models using prototype data, it can be mentioned (Gessler, 2005;Turan et al, 2008;Zeng et al, 2016). This approach can be considered expensive and complex because of the instrumentation system to be used in large hydraulic works, besides the impossibility of controlling the sampled scenarios, including extreme scenarios that are rare and the most worrying for structure safety.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental models applied to an ogee crest spillway and roller bucket stilling basin

Morais

Gireli

Vatavuk

2020

RBRH

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Traditionally, reduced physical models are used to allow control, instrumentation and experimental evaluation of flow. More recently, computational fluid dynamics (CFD) has emerged as a tool that allows numerical modeling of flows and can complement the information provided by the physical model. The objective this paper is to validate the CFD tool in reproducing the flow through an ogee crest spillway with a roller bucket stilling basin. This validation was performed with the data from a reduced scale experiment in which measurements were made of the position of the water free surface and of the pressure loads in the spillway profile. It was verified that the CFD tool is suitable for the study of this type of flow, being able to reproduce the experimental results. In the execution of the numerical simulations, special attention was given to the influence of the mesh on the results. An important influence of the mesh was observed in some results, which shows the importance a sensitivity analysis of this parameter when performing CFD simulations. The obtained results offer the prospect of using CFD as a supporting tool for the design of spillways and stilling basins.

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“…Bhajantri, Eldho, and Deolalikar (2006) considering weakly compressible flow, developed their 2D CFD code using finite volume method to model flow on the ogee spillway. A study of flow over an ogee-crested fish bypass was done by Turan, Carrica, Lyons, Hay, and Weber (2008). They applied the CFD code Fluent with a standard k-turbulence closure and structured/unstructured hybrid grid to simulate free surface and velocities in complex 3D hydraulic structures including gates and aeration slots.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of flow over ogee crested spillways under high hydraulic head ratio

Imanian

Mohammadian

2019

Engineering Applications of Computational Fluid Mechanics

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Ogee spillway is one of the most common types of the spillway. Researchers have attempted to investigate the hydraulics of ogee structure under hydraulic heads near the design head. Herein, an ogee-crested spillway is studied at heads significantly greater than the design head. The efforts are undertaken to study the hydrodynamic field under high head ratio conditions by conducting a numerical simulation using OpenFOAM with five turbulence closures including standard k-, realizable k-, RNG k-, k-ω SST and LRR. The comparisons of flow parameters under different head ratios with the experimental data demonstrated that the LRR model had the best performance, which shows its strength in cases dealing with flow separation or significant streamline curvature. It is found that with increasing hydraulic head, up to seven times that of the design head, the flow separation zone grows linearly. Discharge coefficients are studied for a wide range of head ratios. It is concluded that increasing head ratio up to five leads to an increase in the discharge coefficient due to decreasing pressure on the ogee crest. As head ratio increases to greater values, the discharge coefficient drops suddenly due to some changes in the pressure field.

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Study of the Free Surface Flow on an Ogee-Crested Fish Bypass

Cited by 10 publications

References 3 publications

A multiphase model for the hydrodynamics and total dissolved gas in tailraces

A multiphase model for the hydrodynamics and total dissolved gas in tailraces

Numerical and experimental models applied to an ogee crest spillway and roller bucket stilling basin

Numerical simulation of flow over ogee crested spillways under high hydraulic head ratio

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