Calibration of Stage–Discharge Relationship for Rectangular Flume with Central Cylindrical Contraction

Samani, Zohrab; Baharvand, Saman; Davis, Seth J

doi:10.1061/(asce)ir.1943-4774.0001595

Cited by 5 publications

(4 citation statements)

References 12 publications

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“…Then the absolute discharge error of scaled up CFD model was calculated as 1.41 %. This shows the possibility of scaling-up of the results of the proposed model to the scaled-up field conditions (Samani et al 2021). Kapoor et al (2021) proposed a discharge prediction model (Eq.…”

Section: Comparison With Cfd Modelmentioning

confidence: 93%

“…Later, Hager (1988) used a circular cylinder in a circular conduit and presented a graphical approach for discharge prediction using upstream energy values. The circular cylinder as a baffle flume, was later used by many researchers Samani et al (1991), Samani and Magallenez (1993), Badar and Ghare (2012), Ghare and Badar (2014), Samani (2017) and Samani et al (2021), to provide discharge prediction models. The concept of use of a mobile circular cone as a baffle obstruction in trapezoidal channel was also introduced by Hager (1986) and that was later comprehensively investigated by Kapoor et al (2019).…”

Section: Introductionmentioning

confidence: 99%

“…Samani (2017) developed a single calibrated discharge equation for trapezoidal, rectangular, and circular channels by combining the π theorem principle with laboratory-scale physical models of cylindrical baffles. Samani et al (2021), developed a stage-discharge relationship using laboratory data with different configurations of cylindrical baffles in rectangular channels. The resultant stage-discharge model was also compared with the Computational Fluid Dynamics (CFD) -based simulation model.…”

Section: Introductionmentioning

confidence: 99%

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An Improved Channel Flow Measurement Approach Using Conical Central Baffle Flumes

Nair

Ghare

Kapoor

2023

Preprint

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A simple and inexpensive way of channel discharge measurement is to introduce an axial obstruction in the flow cross- section, thereby creating the critical flow conditions. Such flow measuring devices are referred to as baffle flumes. Literature showed that the critical flow conditions are routinely assumed to occur at the minimum flow cross-section in the flume, however practically the critical section lies slightly on the upstream side. This paper presents an analytical approach to deduce the discharge prediction model on the basis of identification of true location of critical flow section that lies near the vicinity of the least constricted section in the baffle flume. Using the experimental data, a relationship between the ratio of energy to critical depth and the geometrical configuration of the baffle flume having conical shaped obstruction in a trapezoidal channel section, is obtained. Coupled with the expression for critical contracted width, the location of the critical flow section is established. Numerical analysis has also been carried out to ascertain the applicability of the proposed discharge prediction model. The discharge prediction model presented herein for the Conical Central Baffle Flume, is found to provide the discharge with better accuracy (maximum error 2.49%) when compared with the Kapoor et al. (2021) model available in the literature (maximum error 5.24%). An illustrative example to demonstrate use of the proposed methodology, is also appended herein for the benefit of the field hydraulic engineers dealing with flow measurements.

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Section: Comparison With Cfd Modelmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Improved Channel Flow Measurement Approach Using Conical Central Baffle Flumes

Nair

Ghare

Kapoor

2023

Preprint

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“…For the first time, the discharge coefficient in these structures was investigated by Hager & Dupraz (1985). Discharge equations for contraction flumes were developed by Samani et al (2021). Results indicated that this function is useful for the design of hydraulic structures.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of supercritical flow in sudden contractions flumes

Süme

2024

AQUA — Water Infrastructure, Ecosystems and Society

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In this research, the effect of sudden non-continuous contraction on the energy dissipation of supercritical flows was numerically investigated. This study focuses on energy dissipation in sudden contractions in supercritical flows. The numerical models were studied using FLOW-3D software and the random number generator (RNG) turbulence model. The laboratory tests were performed on sudden contractions of 10–15 cm and used shapes such as geometric trapezoidal and semicircular. Numerical simulations were carried out at a distance of 1.5 m from the supercritical flow generator gate, at a fixed opening of 2.6 cm, with the Froude number in the range of 2.5–7 and the relative contraction in the range of 8.9–9.73. This laboratory study found that as the Froude number of the upstream flow increases, the energy dissipation increases in the upstream (ΔE/E0) and downstream (ΔE/E1). For the 15 cm contraction, the results indicated that the energy loss compared with section A is 48.25% and compared with section B, it is 69.5% more than a free hydraulic jump in this channel. According to the conclusion, this value in trapezoidal constriction is 45.73 and 63.6% higher than in free hydraulic jump, respectively.

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Investigation of Energy Dissipation Rate of Stepped Vertical Overfall (SVO) Spillway Using Physical Modeling and Soft Computing Techniques

Baharvand

Rezaei²,

Talebbeydokhti³

et al. 2022

KSCE J Civ Eng

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Calibration of Stage–Discharge Relationship for Rectangular Flume with Central Cylindrical Contraction

Cited by 5 publications

References 12 publications

An Improved Channel Flow Measurement Approach Using Conical Central Baffle Flumes

An Improved Channel Flow Measurement Approach Using Conical Central Baffle Flumes

Numerical simulation of supercritical flow in sudden contractions flumes

Investigation of Energy Dissipation Rate of Stepped Vertical Overfall (SVO) Spillway Using Physical Modeling and Soft Computing Techniques

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