Turbulence Modeling of Flows over Circular Spillways

Tadayon, Rahim; Ramamurthy, Amruthur S.

doi:10.1061/(asce)ir.1943-4774.0000012

Cited by 17 publications

(5 citation statements)

References 14 publications

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“…Today, the use of numerical simulation as a powerful tool in the design of spillways and evaluation of their alternative plans is common. In this regard, numerous studies have been published, most of which confirm the accuracy of numerical modeling results (Ghaderi et al 2020a(Ghaderi et al , 2020bRahimzadeh et al 2012;Tadayon and Ramamurthy 2009;Bai et al 2017;Zhan et al 2016;Mohammad Rezapour Tabari and Tavakoli 2016;Bagheri and Kabiri-Samani 2020b). The velocity of the flow on the spillway's chute is very high, which increases the risk of cavitation as well as scouring downstream of the spillway.…”

Section: Introductionmentioning

confidence: 70%

Numerical simulation of flow on circular crested stepped spillway

et al. 2022

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The spillways are one of the most important hydraulic structures used in river engineering, dam construction, irrigation, and drainage engineering projects. Recently, a new type of such spillways with a circular crest has been proposed. In this paper, the hydraulic properties of the circular crested stepped spillway (CCSS) including flow pattern, distribution of velocity on the crest and pressure, turbulence intensity, discharge coefficient ($${C}_{d}$$ C d ) and energy dissipation ratio (EDR) were investigated numerically. To model the free surface of flow the volume of fluid technique, and for modeling the turbulence of flow, k − ε (RNG) was utilized. Results declared that there is a good agreement between the laboratory observations and numerical simulation. The $${C}_{d}$$ C d of the CCSS changes between 0.9 and 1.4 considering the range of relative upstream head ($${h}_{up}/R$$ h up / R ) between 0.33 m and 2.67. The observation of the flow streamlines showed that they are tangential to the curvature of the crest and there is no separation of the flow from the crest. Examination of the pressure distribution on the CCSS model shows that just downstream part of the crest, the pressure is partially negative. Of course, the same partial negative pressure is observed on the edge of the steps. The steps increase the maximum intensity turbulence by 50%. The CCSS can dissipate the energy of flow between 90 and 30%, and in the skimming flow regime, the portion of each step in the energy dissipation regardless of their position is almost identical.

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Section: Introductionmentioning

confidence: 70%

Numerical simulation of flow on circular crested stepped spillway

et al. 2022

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“…These terms are then evaluated as fluxes at the surfaces of each finite volume. The FEM and FVM are Tadayon and Ramamurthy (2009) [40] investigated three different turbulence models which are; Reynolds Stress Model, RSM, Renormalized k-ϵ model, RNG k-ϵ, and standard k-ϵ model, to analysis the flow over circular spillways. The FVM was also used for the numerical simulation.…”

Section: Methodsmentioning

confidence: 99%

Application of Numerical Methods in Design of Hydraulic Structures

Rad¹

2016

Communications on Advanced Computational Science with Applicati

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This study was aimed to evaluate the use of numerical methods in the design of hydraulic structures and use a numerical model to validate the simulation of flow over three types of spillway which are: smooth spillway, various of step spillway, labyrinth spillway and side spillway. Numerical methods can assist in the design of hydraulic structures in the evaluation of the energy loss, calculated discharge coefficient and cavitation phenomena investigated by examining the pressure field and flow field. Designers are challenged to use numerical methods for the design of hydraulic structures due to the complexity of the specific flow field of hydraulic structures, such as the free surface flow, two-phase and multi-phase flows, turbulent flow and turbulence. In this study provide the best and efficient numerical methods for the numerical modeling of hydraulic structures, which are obtained by various researchers who have conducted research studies on numerical methods. Using the guidelines presented in this study can help designers in numerical modeling of hydraulic structures that are under all the facts and reliable models apply the results of the numerical method.Computational Fluid Dynamics (CFD) is a type of numerical model that can be used to solve problems involving fluid flow. CFD can provide a significant amount of computation time and more economical solution than a physical model. The fundamental principles for all numerical models are similar. Problems can be described, physically, by a set of partial differential equations. Then, a numerical method is used to formulate a set of algebraic equations that represent the partial differential equations.

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“…Here, the standard k-ɛ turbulence model was used, it is based on model transport equations for turbulence kinetic energy (k) and its dissipation rate (ɛ) (Launder & Spalding, 1972). According to Tadayon & Ramamurthy (2009), Aydin & Ozturk (2009), Naghavi et al (2011), Dettmer et al (2013) and Zeng et al (2016), the k-ɛ turbulence model has shown satisfactory results, furthermore, it offers a good compromise between computational effort and numerical precision.…”

Section: Numerical Modelmentioning

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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Turbulence Modeling of Flows over Circular Spillways

Cited by 17 publications

References 14 publications

Numerical simulation of flow on circular crested stepped spillway

Numerical simulation of flow on circular crested stepped spillway

Application of Numerical Methods in Design of Hydraulic Structures

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

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