Energy Loss Estimation and Flow Simulation in the skimming flow Regime of Stepped Spillways with Inclined Steps and End Sill: A Numerical Model

Hamedi, Amirmasoud; Ketabdar, Milad

doi:10.7753/ijsea0507.1006

Cited by 14 publications

(10 citation statements)

References 26 publications

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“…Dimensionless parameter /ℎ was used to measure energy dissipation. The obtained results revealed that in the discharge of 30 / (discharge per unit width = 0.0225 2 / ), which indicates Nappe flow regime, the steps with simultaneous slope and sill (in which the ratio of m/h is less than 0.7) significantly increases energy dissipation [12].…”

Section: Literature Reviewmentioning

confidence: 82%

A Study of the Conditions of Energy Dissipation in Stepped Spillways with Λ-shaped step Using FLOW-3D

2017

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In the present study, energy dissipation was investigated in a specific type of stepped spillways. The purpose was to achieve the highest level of energy dissipation in downstream of the spillway. It was performed by providing a specific type of geometry for step as a great roughness. Here, steps were recognized as great roughness against flow. Their shape and number were designed in such a way that the maximum flow energy can be minimized in this stage, i.e. over steps before reaching to downstream. Accordingly, it can be stated that the highest energy dissipation rate will be obtained in the structure at downstream. Moreover, thereby, heavy costs imposed by designing and constructing stilling basin on project can be minimized. In this study, FLOW-3D was employed to analyse and obtain energy dissipation rate. The best geometry of the steps, through which the maximum energy dissipation can be achieved, was determined by reviewing related literature and inventing the proposed model in FLOW-3D. To evaluate the proposed method, analyses were performed using trial and error in mesh networks sizes as well as the mentioned methods and the results were compared to other studies. In other words, the most optimal state was obtained with Λ-shaped step at angel of 25 degree with respect to energy dissipation rate compare to smooth step.

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Section: Literature Reviewmentioning

confidence: 82%

A Study of the Conditions of Energy Dissipation in Stepped Spillways with Λ-shaped step Using FLOW-3D

2017

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“…Fluent is employed to solve Naiver-Stokes' equations. Many researchers used turbulent model (K-) to solve NaiverStokes' equations [9] [10] and compared their results with experimental works [11]. Since, this turbulent model is used to compute continuity and momentum equations in this study.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Numerical and Empirical Studies on the Hydraulic Conditions of 90 degree converged Bend with Intake

Ketabdar¹

2016

IJSEA

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A river's outer bank is the best place to install intake to mitigate the harmful effects of sedimentation. Flow pattern in the intake zone depends on bend geometry, intake location, and intake angle. All previous investigations on a ninety-degree channel bend are limited to studying the flow pattern in non-converged channel bends in the absence of wooden debris. Non-converged channel bends, in natural streams, convert to converged bends due to sedimentation effects. The minimum sedimentation in intake, in forest streams, can be seen in the best intake angle in converged channel bends. The experimental model has been employed to determine the best intake angle and the numerical model is used to investigate on flow regime in intake zone by Fluent. Comparing numerical results with empirical results shows that Fluent has a good capability to model flow in converged bend with intake.

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“…Also numerical studied by using Flow-3D to show the effect of the number of steps and drainage on top of the stepped spillway on the energy dissipation which showed the proof of the inverse relation between the discharge rate and the dissipation of energy and the great software simulation for different cases [4][5][6]. Based on the use of both FLUENT and V-Flow to modeling the unstable twodimensional flow over the stepped spillway, results obtained by the FLUENT program for the energy dissipation for the stepped spillway showed a reasonable agreement in results [7][8][9]. Also, artificial neural network (ANN) and the techniques of gene expression used for modeling the experimental data of nappe and skimming flow over stepped spillways, so the results obtained from these techniques were at a reliable level in the prediction of the energy dissipation [10].…”

Section: Introductionmentioning

confidence: 95%

Numerical Simulation for Estimating Energy Dissipation over Different Types of Stepped Spillways and Evaluate the Performance by Artificial Neural Network

Jamel

2018

Tikrit j. eng. sci.

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A B S T R A C TIn this research, Flow-3D software uses to study the energy dissipation for stepped spillways with different end sills. The study is bases on three models. The first model contains rectangular end sills in all steppes. The second model contains rectangular end sills between one step and another. The third model contains triangular end sills in all steppes. For each of these models, three different variables are adopt, slope, height of the spillway and a number of steppes, and four different discharges value, carrying the total number of experiments to (324) tests. Analytical results show that the model (3) is the highest energy dissipation for all discharges value. Empirical equations extraction to find the energy dissipation for each of these models. The artificial neural network is also adopt to prove the accuracy and efficiency of the analytical results which are at high rates of compatibility with the values of the coefficient of determination for (model 1), (model 2) and (model 3) equal to (93.47%), (88.20%) and (86.00%) respectively. Also, artificial neural network identifies the most influential factors on the energy dissipation, the friction Froude number is the highest impact on the energy dissipation for models (1) and (2), while the parameter (b/ks) for the model (1).

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Energy Loss Estimation and Flow Simulation in the skimming flow Regime of Stepped Spillways with Inclined Steps and End Sill: A Numerical Model

Cited by 14 publications

References 26 publications

A Study of the Conditions of Energy Dissipation in Stepped Spillways with Λ-shaped step Using FLOW-3D

A Study of the Conditions of Energy Dissipation in Stepped Spillways with Λ-shaped step Using FLOW-3D

Numerical and Empirical Studies on the Hydraulic Conditions of 90 degree converged Bend with Intake

Numerical Simulation for Estimating Energy Dissipation over Different Types of Stepped Spillways and Evaluate the Performance by Artificial Neural Network

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