Simulation of Free Surface Flow over Spillway

Song, Charles C. S.; Zhou, Fayi

doi:10.1061/(asce)0733-9429(1999)125:9(959)

Cited by 44 publications

(17 citation statements)

References 9 publications

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“…The number of studies on computational fluid dynamics (CFD) focusing on hydraulic structures has increased notably in the last 10 years [8,15,28,35,46,50,54,68,[75][76][77]80,87]. A small number of simulations of the skimming flow over stepped spillways have been communicated very recently [5,23,[29][30][31]79], describing both the aerated and non-aerated flow regions.…”

Section: Introductionmentioning

confidence: 99%

Laboratory measurements and multi-block numerical simulations of the mean flow and turbulence in the non-aerated skimming flow region of steep stepped spillways

2010

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We present and discuss the results of a comprehensive study addressing the non-aerated region of the skimming flow in steep stepped spillways. Although flows in stepped spillways are usually characterized by high air concentrations concomitant with high rates of energy dissipation, the non-aerated region becomes important in small dams and/or spillways with high specific discharges. A relatively large physical model of such spillway was used to acquire data on flow velocities and water levels and, then, well-resolved numerical simulations were performed with a commercial code to reproduce those experimental conditions. The numerical runs benefited from the ability of using multi-block grids in a Cartesian coordinate system, from capturing the free surface with the TruVOF method embedded in the code, and from the use of two turbulence models: the k−ε and the RNG k−ε models. Numerical results are in good agreement with the experimental data corresponding to three volumetric flow rates in terms of the time-averaged velocities measured at diverse steps in the spillway, and they are in very satisfactory agreement for water levels along the spillway. In addition, the numerical results provide information on the turbulence statistics of the flow. This work also discusses important aspects of the flow, such as the values of the exponents of the power-law velocity profiles, and the characteristics of the development of the boundary layer in the spillway.

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Section: Introductionmentioning

confidence: 99%

Laboratory measurements and multi-block numerical simulations of the mean flow and turbulence in the non-aerated skimming flow region of steep stepped spillways

2010

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“…The results of the simulations indicated that the numerical model was in a good agreement with the physical one. Song and Zhou (1999) used a large simulation with an explicit finite volume scheme to determine the free surface flow over ogee-crested overflow spillway. The location of the free surface was computed using the marker and cell method of Harlow and Welsh (1965) while a free steepness limiting approach was used to model the free surface waves.…”

Section: Literature Reviewmentioning

confidence: 99%

Modeling of the Hydraulic Performance of Ogee Spillway Using Computational Fluid Dynamics (Cfd)

Mohammed

Noori

Hussein

2017

juod

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Computational fluid dynamics (CFD) is a type of numerical modeling that is used to solve problems involving fluid flow. Since CFD can provide faster and more economical solution than physical modeling, hydraulic engineers are interested in verifying the capability of CFD software. This study has examined the ability of the commercial CFD software (Flow-3D) to model an ogee-crested spillway by making data comparisons to physical models (experimental data). Three spillway models of different heights (20cm, 25cm, and 30cm) were fabricated and tested for design heads of (5cm, 7cm, 10cm), respectively. The study was conducted to compare flow parameters over a standard ogee-crested spillway using physical and numerical models. The physical models were fabricated from a rigid foam and placed in a test flume. Pressure taps were installed along the entire length of the spillways. Water surface profiles and pressure data were recorded for five different flow conditions (1.2Hd, 1Hd, 0.75Hd, 0.5Hd, and 0.25Hd). The results of this study showed that there were good agreements between the results of physical and numerical models for water surface profiles and there were some discrepancies in pressure results.KEY WORDS: Ogee Spillway, Modeling, CFD, Surface Profiles, Pressure Measurements. INTRODUCTIONhe most common type of spillways is the ogee-crested spillway that widely used all over the world due to its ability to pass flow efficiently and safely when properly designed and constructed. The performance characteristics of ogee-crested spillways are due to its shape being derived from the lower surface of an aerated nappe flowing over a sharp-crested weir. The ogee shape results in near-atmospheric pressure over the crest section for a design head. If the head is lower than the design head, the discharge is less because of the crest resistance. However, at higher heads, the discharge is greater than an aerated sharp-crested weir because the negative crest pressure suctions more flow. The analysis of water flow over a spillway is an important engineering problem using the empirical information and physical model studies. The use of physical models can be very costly, time consuming, has error due to scale, and has limitations to take various options throughout the design process.Presently hydraulic engineering relies heavily on physical models for the design of spillways and most hydraulic structures. With the advances in numerical methods and computing power, computational models of spillway flows are increasingly being used in industry but still require validation by a physical model to ensure that the virtual modeling of physical processes is accurate. The consequences of the failure of large hydroelectric dam on downstream sections of a river reach most importantly on human life can be catastrophic.Several computational approaches have been developed including modeling in one, two or three dimensions which use a wide variety of equations and discretization techniques. In the present study, a numerical model using ...

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“…2 [2]. Many researchers have studied for numerical and experimental studies on spillways [3][4][5][6][7]. And ANN [8], studied for scour depth prediction for ski-jump type of spillways.…”

Section: Introductionmentioning

confidence: 99%

Analytical and artificial neural network models to estimate the discharge coefficient for ogee spillway

Yarar

2017

E3S Web Conf.

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Abstract. In this study, analytical and Artificial Neural Network (ANN) model were used for determine the discharge coefficient of Ogee Spillways. For this aim, discharge coefficients of 11 different heads were calculated by using a test flume having 7.5 cm width, 15 cm depth and 5 m length, in the laboratory. Discharge coefficients were also computed by the formula for the same heads measured in the laboratory to investigate the accuracy of experimental setup. An ANN model was set by using the experimental results in order to estimate the discharge coefficient. Then, the performance of the ANN model was investigated. As the result, the coefficient of determination between ANN model and experimental setup is found R 2 = 0.98. ANN model is show a good consistency with experimental results.

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Simulation of Free Surface Flow over Spillway

Cited by 44 publications

References 9 publications

Laboratory measurements and multi-block numerical simulations of the mean flow and turbulence in the non-aerated skimming flow region of steep stepped spillways

Laboratory measurements and multi-block numerical simulations of the mean flow and turbulence in the non-aerated skimming flow region of steep stepped spillways

Modeling of the Hydraulic Performance of Ogee Spillway Using Computational Fluid Dynamics (Cfd)

Analytical and artificial neural network models to estimate the discharge coefficient for ogee spillway

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