CFD Modelling of a Stepped Spillway with Various Step Layouts

Li, Shicheng; Li, Qiulin; Yang, James

doi:10.1155/2019/6215739

Cited by 6 publications

(3 citation statements)

References 33 publications

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“…Li et al [13] devised distorted step faces and pool weirs to improve the hydraulic behaviors for traditional stepped spillways. By numerical modelling, comparative studies were conducted to look into the flow features.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional analysis of the performance of circular stepped spillways in the skimming flow regime

Ghaderi,

Ebrahimnezhadian,

Mollazadeh

2024

J Braz. Soc. Mech. Sci. Eng.

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By creating an artificial rough bed, stepped spillways increase energy dissipation during the spillway and reduce the risk of cavitation and the dimensions of the stilling basin. Combining stepped spillways with labyrinth spillways in order to improve their performance can be an attractive idea. Therefore, in this research, the hydraulic characteristics of the flow, the amount of energy dissipation and the residual energy of the flow downstream of the stepped spillway with a circular labyrinth configuration, with different numbers of cycles, were compared with the conventional stepped spillway. Validation of the numerical model was done using the results of the physical model. Four three-dimensional configurations of stepped spillway including: conventional stepped, two-, three-, and four-cycle circular labyrinth were modeled using OpenFOAM open source for the skimming flow regime. In order to simulate the flow, InterFOAM solver and RNG K  − turbulence model were used. The results of the numerical model showed that the combination of the labyrinth spillway with the stepped spillway causes an increase of 7.4, 28 and 18.3 percent of energy dissipation in circular forms of two, three and four cycles compared to its conventional type for a constant discharge and yc/h=1.68. Therefore, among the circular labyrinth configurations, the three-cycle form (3CSS) has the highest dissipation rate. In addition, in the three-cycle circular labyrinth configuration, compared to other conventional and labyrinth configurations, it has resulted in less negative pressure in the upper half of the vertical face of the steps.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional analysis of the performance of circular stepped spillways in the skimming flow regime

Ghaderi,

Ebrahimnezhadian,

Mollazadeh

2024

J Braz. Soc. Mech. Sci. Eng.

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“…Hekmatzadeh et al (2018) demonstrated more efficiency of the flat stepped spillway in comparison to the pooled stepped spillway if the spillway slope exceeds 14°. Li et al (2019) provided numerical insight into the hydraulic characteristics of V-shaped spillways with several step layouts. Arjenaki & Sanayei (2020) carried out a numerical analysis to investigate the effects of different types of step geometries on the energy dissipation rate of stepped spillways.…”

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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“…e stepped spillway drainage structure dates back to 2500 years ago [10], and it has good energy dissipation; it can greatly shorten the length of the stilling pool and reduce the project's investment costs. With the development of roller concrete damming technology, this technique has been widely applied [11], and scholars both at home and abroad have conducted in-depth studies on it [12,13]. Wu et al [14] found that the location of the inception point of the air entrainment for the stepped spillway is much nearer to the top of the spillway than a smooth spillway, which led to the high energy dissipation ratio of the stepped spillway.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Stepped Spillways with Front Step Deformation

Zhang

et al. 2021

Mathematical Problems in Engineering

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In order to solve the flood discharge problem of both small- and medium-sized warping dams in the Loess Plateau, a stepped spillway scheme, based on an ecological bag, to achieve full-section water flow and energy dissipation has been proposed in this paper. The hydraulic and energy dissipation characteristics of a stepped spillway layout scheme were studied using 3D numerical simulation. As the height of the dams is low and the spillways are short, the research has shown that the traditional single-step layout scheme leads to a low overall energy dissipation rate due to the small amount of energy dissipated in the initial steps. As a result of this, this paper has put forward two kinds of step layout schemes such as the shunt type and the staggered type for the initial steps. Through analysis of the flow state, the pressure distribution, and the total energy dissipation rate, the results have shown that shunt type and staggered type with front step deformation produced an obvious mixing of the water flow, fewer negative pressure areas, and a higher energy dissipation rate. The optimal energy dissipation rate of the staggered type reached 87.75%, and the maximum energy dissipation rate was increased by 27.97%.

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CFD Modelling of a Stepped Spillway with Various Step Layouts

Cited by 6 publications

References 33 publications

Three-dimensional analysis of the performance of circular stepped spillways in the skimming flow regime

Three-dimensional analysis of the performance of circular stepped spillways in the skimming flow regime

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

Numerical Simulation of Stepped Spillways with Front Step Deformation

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