Energy Dissipation on Rough Stepped Spillways

Torabi, Hasan; Parsaie, Abbas; Yonesi, Hojjatallah; Mozafari, Ehsan

doi:10.1007/s40996-018-0092-5

Cited by 12 publications

(2 citation statements)

References 22 publications

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“…Geometry, boundary conditions, and turbulence are only a few of the variables that have an impact on the stepped designs' flow behaviour and pattern. Torabi et al (2018) found that, in regards to the nappe flow regime, energy dissipation was elevated by 15-20% when steps were constructed with roughness elements, as opposed to smooth steps. Thus, the continued research surrounding stepped spillways has similarly indicated that they are a reliable and effective method for dissipating excess flow energy.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis of the Effects of Compound Downstream Slope on Flow Over the Spillway

Jahad,

Chabuk,

Alabas

et al. 2023

J. Ecol. Eng.

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The volume of the stilling basin can be reduced, energy can be dissipated, and floods can be contained with the help of spillways. The aim of this Computational Fluid Dynamics (CFD) study is to investigate how compound slopes change water flows t hrough spillways. To m easure t urbulence, t he R ealizable k -ε m odel w as u sed, and the multiphase volume of fluid (VOF) method was utilized to determine where air and water meet. Five models of spillways with different slopes (normal slope (MS1) = 30°, compound slope(MS2 and MS3) = 20°/39°, and compound slope (MS4 and MS5) = 39°/20°) were modelled and simulated using the ANSYS Fluent software to determine their flow characteristics. Numerical simulation results were compared to experimental results, and it was found that the CFD model captured the key flow aspects accurately. The numerical model carefully observes the several flow patterns (nappe, transition, and skimming) that emerged owing to variations in slope and geometry. When it comes to dissipating energy, models with a compound slope (39°/20°) do the best. When compared to the normal slope model (30°) with a step size of 10, the increase in energy dissipation is 14%. According to the findings, the TKE (turbulent kinetic energy) was elevated by the compound slope. The results of this research show that the spillway can be operated effectively and reliably under a wide range of flow conditions, fulfilling an important goal of the project.

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Section: Introductionmentioning

confidence: 99%

CFD Analysis of the Effects of Compound Downstream Slope on Flow Over the Spillway

Jahad,

Chabuk,

Alabas

et al. 2023

J. Ecol. Eng.

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“…Sarkardeh et al (2015) employed a physical model of the stepped spillway to modify the zone where the stepped chute profile and the ogee spillway crest are joined together. The results obtained from studies of Torabi et al (2018) in situ indicated that the roughness of the steps may enhance the performance of the spillway in terms of energy dissipation by 15-20% compared to the stepped spillway without step roughness. Benefiting from fast-growing computing power, various models have been employed in recent years in the domain of numerical models.…”

Section: Introductionmentioning

confidence: 99%

The effect of triangular prismatic elements on the hydraulic performance of stepped spillways in the skimming flow regime: an experimental study and numerical modeling

Roushangar

Akhgar

Shahnazi

2022

Journal of Hydroinformatics

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The stepped spillway is a cost-effective hydraulic structure to dissipate the energy of large water flow over the spillway of a dam. In this study, the focus was placed on the effects of triangular prismatic elements (TPEs) on the hydraulic performance of a stepped spillway. Nine stepped spillway models were experimentally and numerically investigated with different shapes and layouts of TPEs. To adopt a proper turbulent model, RNG k-ε and standard k-ε models were utilized. The computational model results satisfactorily simulated the complex flow over the stepped spillway of experiment cases, including velocity distributions and pressure profiles on the step surfaces. The results indicated that the installation of TPEs on stepped spillways can be an effective way to reduce cavitation effects. Installing TPEs on stepped spillways increased the energy dissipation rate up to 54%. The performance of stepped spillways was improved when TPEs were spaced more closely together. Furthermore, the relationships between the roughness coefficient (f) and the ratio of the critical depth to the step roughness (yc/k) were obtained with high accuracy using the experimental data.

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Study of the Energy Dissipation over the Type-A Piano Key Weir

Singh

Kumar

2023

KSCE Journal of Civil Engineering

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Energy Dissipation on Rough Stepped Spillways

Cited by 12 publications

References 22 publications

CFD Analysis of the Effects of Compound Downstream Slope on Flow Over the Spillway

CFD Analysis of the Effects of Compound Downstream Slope on Flow Over the Spillway

The effect of triangular prismatic elements on the hydraulic performance of stepped spillways in the skimming flow regime: an experimental study and numerical modeling

Study of the Energy Dissipation over the Type-A Piano Key Weir

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