Briefing: Water surface profile over side weir in a trapezoidal channel

Vatankhah, Ali R.

doi:10.1680/wama.11.00065

Cited by 15 publications

(5 citation statements)

References 16 publications

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“…Using the principles of specific energy. Vatankhah 15 developed an analytical method to calculate the free surface flow profile along a side weir installed in a trapezoidal shape channel.…”

Section: Introductionmentioning

confidence: 99%

A New Coefficient of Discharge Relation for Flow Over Broad-Crested Rectangular Side Weir in a Trapezoidal-Type Channel

Sarchami¹,

Tousi²,

Afshar³

et al. 2022

J. of Applied Sciences

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Background and Objective: One of the new methods to receive and distribute flow in floodwater spreading systems is utilizing side weirs.These weirs are employed extensively in environmental, irrigation and hydraulics engineering to control the flow direction. This work evaluates the hydraulic behaviour of the rectangular broad-crested side weir in a trapezoidal shape channel numerically and experimentally to calculate the coefficient of discharge. Materials and Methods: In this investigation, gene expression programming is employed to predict the discharge coefficient under various conditions. Results: The study results revealed that six key factors affect the side weir discharge coefficient, which is the froude number (F r ), main channelʼs bed slope, side weir stepʼs height to side weirʼs length the side weirʼs angle (2), side weir stepʼs height to upstream flow depth of side weir and upstream flow depth of side weir to

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“…Using the principles of specific energy. Vatankhah 15 developed an analytical method to calculate the free surface flow profile along a side weir installed in a trapezoidal shape channel.…”

Section: Introductionmentioning

confidence: 99%

A New Coefficient of Discharge Relation for Flow Over Broad-Crested Rectangular Side Weir in a Trapezoidal-Type Channel

Sarchami¹,

Tousi²,

Afshar³

et al. 2022

J. of Applied Sciences

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“…Also, Shabanlou (2015, 2016) simulated flow field within triangular canals along the side weirs in subcritical and supercritical flow regimes. In association with passing flow through trapezoidal channels, Cheong (1991) and Vatankhah (2012b) have conducted experimental and numerical studies. Additionally, Azimi et al (2017aAzimi et al ( , b, 2019 predicted discharge coefficient of side weirs by using some artificial intelligence techniques.…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of turbulent flow in a circular conduit along a side weir

et al. 2019

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Side weir is used as a slot in the side wall of the main channel to direct excess water that is above the weir crest. Such structures are used in control of flow level in irrigation, drainage networks and urban sewage disposal systems. Furthermore, circular channels are pretty important because considerable length of sewage disposal and transmission pipeline system is made of circular channels. In this study, changes inflow free surface, turbulence and flow field passing through a circular channel along a side weir are simulated. This means that for modeling the variations in flow free surface and the flow field turbulence, the volume-of-fluid scheme and RNG k-ε turbulence model are used, respectively. In order to validate the accuracy of the numerical model, the flow free surface changes along the side weir, the discharge coefficient of side weir, discharge of side weir, Froude number at upstream of the side weir and specific energy are compared with the experimental measurements. Comparison of simulation results with the experimental measurements shows high accuracy of CFD model. In other words, the root-mean-square error percent and the mean absolute error for flow free surface are, respectively, obtained to be 0.554% and 0.547%. Moreover, average difference between the specific energy at upstream and downstream of the side weir is calculated about 2.1%. The main purpose of this simulation is gaining an understanding of behavior of the passing flow through circular channels with side weir for subcritical flow regime.

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“…For instance, Cheong (1991) presented an equation in order to compute the discharge coefficient of side weirs located on trapezoidal conduit. Also, Vatankhah (2012a) proposed an analytical solution to predict the variations of flow free surface along the side weir for subcritical and supercritical flow regimes. For U-shaped channels along the side weir, Uyumaz (1997) using the specific energy principles and the finite difference method provided an analytical solution for predicting variations of the flow free surface profile along the side weirs.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of bed slope change effect of circular channel with side weir in supercritical flow conditions

Azimi

Shabanlou

2018

Appl Water Sci

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In this numerical study, the pattern and the field of the passing flow through circular channels with the side weir in supercritical flow conditions are simulated using the FLOW-3D model. First, the numerical model results are validated with the experimental data and a good agreement between the results is obtained from the numerical simulation and the experimental data. Then, the effects of the slope change of the circular channel bed on the flow free surface, the discharge of the side weir, the Froude number at the end of the side weir upstream, the discharge coefficient of the side weir, the specific energy and the slope of the S3 profile are investigated. In this study, the flow field turbulence and variations of the free surface computational field are simulated using the RNG k − turbulence model and the volume of fluid (VOF) method, respectively. In practice, transmission channels used in irrigation networks and urban sewage disposal systems are steep. Therefore, the main purpose of this computational fluid dynamics (CFD) study is investigating the effect of the bed slope change of circular channels with side weir in supercritical flow conditions on the pattern and the structure of these types of flows.

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Briefing: Water surface profile over side weir in a trapezoidal channel

Cited by 15 publications

References 16 publications

A New Coefficient of Discharge Relation for Flow Over Broad-Crested Rectangular Side Weir in a Trapezoidal-Type Channel

A New Coefficient of Discharge Relation for Flow Over Broad-Crested Rectangular Side Weir in a Trapezoidal-Type Channel

Numerical evaluation of turbulent flow in a circular conduit along a side weir

Numerical study of bed slope change effect of circular channel with side weir in supercritical flow conditions

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