Investigation of flow characteristics above trapezoidal broad-crested weirs

Madadi, Mohamad Reza; Dalir, A Hosseinzadeh; Farsadizadeh, D

doi:10.1016/j.flowmeasinst.2014.05.014

Cited by 25 publications

(21 citation statements)

References 24 publications

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“…All values of Cd are in the range from 0.3 to 0.41, which is consistent with the range reported by [2,33,38].…”

Section: Discharge Coefficientsupporting

confidence: 90%

“…For 60° ≤ θ ≤ 90°, a flow separation region can be found on the rectangular crest; this is called the crest recirculation zone [40]. The separation region influences the discharge performance of a weir [2,38,40,41]. In short, Figure 4 shows a strong effect of the upstream angle on the flow field structure of the broad-crested weir in the streamline patterns; and the flow fields obtained by the two turbulence models are basically similar.…”

Section: Computed Streamline Patternsmentioning

confidence: 87%

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Numerical Modeling of Flow Over a Rectangular Broad-Crested Weir with a Sloped Upstream Face

Jiang

Diao

Sun

et al. 2018

Water

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The objective of this study was to evaluate the effect of the upstream angle on flow over a trapezoidal broad-crested weir based on numerical simulations using the open-source toolbox OpenFOAM. Eight trapezoidal broad-crested weir configurations with different upstream face angles (θ = 10°, 15°, 22.5°, 30°, 45°, 60°, 75°, 90°) were investigated under free-flow conditions. The volume-of-fluid (VOF) method and two turbulence models (the standard k-ε model and the SST k-w model) were employed in the numerical simulations. The numerical results were compared with the experimental results obtained from published papers. The root mean square error (RMSE) and the mean absolute percent error (MAPE) were used to evaluate the accuracy of the numerical results. The statistical results show that RMSE and MAPE values of the standard k-ε model are 0.35–0.67% and 0.50–1.48%, respectively; the RMSE and MAPE values of the SST k-w model are 0.25–0.66% and 0.55–1.41%, respectively. Additionally, the effects of the upstream face angle on the flow features, including the discharge coefficient and the flow separation zone, were also discussed in the present study.

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“…All values of Cd are in the range from 0.3 to 0.41, which is consistent with the range reported by [2,33,38].…”

Section: Discharge Coefficientsupporting

confidence: 90%

Section: Computed Streamline Patternsmentioning

confidence: 87%

Numerical Modeling of Flow Over a Rectangular Broad-Crested Weir with a Sloped Upstream Face

Jiang

Diao

Sun

et al. 2018

Water

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Section: Flow Over Trapezoidal-shaped Weirsmentioning

confidence: 99%

“…As described before, Equation (1a) is a special case of Equation (10a) under the condition of an open channel flow with slightly sloped and curved streamlines. The experimental data of Zerihun [12] and Madadi et al [30] was selected to validate the numerical results. Zerihun [12] carried out a series of experiments on flow over symmetrical trapezoidal-shaped weirs, made of Plexiglass, with sides sloped at 26.6 • , whereas Madadi et al [30] conducted similar experiments by using unsymmetrical trapezoidal-shaped weirs with upstream side slopes varying from 21 • to 90 • and a downstream side slope of 54 • .…”

Section: Flow Over Trapezoidal-shaped Weirsmentioning

confidence: 99%

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A Non-Hydrostatic Depth-Averaged Model for Hydraulically Steep Free-Surface Flows

Zerihun¹

2017

Fluids

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This study describes the results of a numerical investigation aimed at developing and validating a non-hydrostatic depth-averaged model for flow problems where the horizontal length scales close to flow depth. For such types of problems, the steep-slope shallow-water equations are inadequate to describe the two-dimensional structure of the curvilinear flow field. In the derivation of these equations, the restrictive assumptions of negligible bed-normal acceleration and bed curvature were employed, thus limiting their applicability to shallow flow situations. Herein, a Boussinesq-type model is deduced from the depth-averaged energy equation by relaxing the weakly-curved flow approximation to deal with the non-hydrostatic steep flow problems. The proposed model is solved with an implicit finite difference scheme and then applied to simulate steady free-surface flow problems with strong curvilinear effects. The numerical results are compared to experimental data, resulting in a reasonable overall agreement. Further, it is shown that the discharge characteristics of free flow over a round-crested weir are accurately described by using a Boussinesq-type approximation, and the drawbacks arising from a standard hydrostatic approach are overcome. The suggested numerical method to determine the discharge coefficient can be extended and adopted for other types of short-crested weirs.

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Prediction of discharge coefficient of the trapezoidal broad-crested weir flow using soft computing techniques

Şimşek

Gümüş

Özlük

2023

Neural Comput & Applic

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Investigation of flow characteristics above trapezoidal broad-crested weirs

Cited by 25 publications

References 24 publications

Numerical Modeling of Flow Over a Rectangular Broad-Crested Weir with a Sloped Upstream Face

Numerical Modeling of Flow Over a Rectangular Broad-Crested Weir with a Sloped Upstream Face

A Non-Hydrostatic Depth-Averaged Model for Hydraulically Steep Free-Surface Flows

Prediction of discharge coefficient of the trapezoidal broad-crested weir flow using soft computing techniques

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