Comparison of Flow over Broad Crested Weir in Laboratory and by a Numerical Method

Abstract

<jats:p>The main purpose of this study is to test the ability of competition fluid dynamic (CFD) model which (FLUENT) program to simulate the flow over broad crested weir with lower cost and lesser time. This purpose is done by operating an experimental model in the laboratory and then validating this model in the GAMBIT program and FLUENT (ANSYS R 15.0), by comparing the results. The FLUENT can solve Navier- Stokes equations of the flow numerically, the volume of fluid method (VOF) and Standard k– ε turbulence equation is depended to simulate water level. Generally, it can be established that the experimental results of flow have a good agreement with the numerical results. The percentage of error (RE %) between numerical and experimental discharge is 2.94%, while the maximum RE % for water level is 6.25%. The numerical results of flow over broad crested weir showed in counter and vector results, and the streamlines of flow was clear than that of the experimental model. Finally, the FLUENT proved that can it be relied upon in future by designing weirs without needing to work experimentally.</jats:p>

Evaluation of ANN, GEP, and Regression Models to Estimate the Discharge Coefficient for the Rectangular Broad-Crested Weir

“…Hager and Schwalt [6] Bos [3] Rao and Muralidhar [11] Azimi and Rajaratnam [12] 0.1< (h / L) < 0.4 Doeringsfeld and Barker [13] Khosrojerdi, Kavianpour [9] Felder and Chanson [14] 0.02 <h/L < 0.3 Salmasi, Poorescandar [15] h/L≤0.27…”

“…Bazin [10] proposed and examined broad-crested weir for the first time after that; other researchers continue his approach as well [11,12]. Singer [13][14][15] showed that discharge coefficient is a function of elevation changes of weir (P) and its length (L). Hager and Schwalt [16,17] studied a more detailed on the hydraulic rectangular broad-crested weir.…”

Effect of Orientation and Vegetation over the Embankment Crest for Energy Reduction at Downstream

“…Nappe flow impinging jet follows a projectile motion in this fixed bed experiment, even changing the crest conditions. In addition, nappe flow impinging jet properties depend on the depth of water at the downstream brink edge of the crest, fallen height, and volume of air under the impinging jet lower profile while reducing the downstream slope [19,24,35,40,44]. Out of these, embankment height (ℎ 𝐸𝐸 ) plays a significant role in the nappe flow properties, mainly on 𝐿𝐿 𝑑𝑑 and 𝑑𝑑 𝑗𝑗𝑒𝑒𝑗𝑗 .…”