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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Flow over Broad Crested Weirs: Comparison of 2D and 3D Models
Author(s)
Shaymaa A. M. Al-Hashimi1, Huda M. Madhloom1, 2, Rasul M. Khalaf1, Thameen N. Nahi1 and Nadhir A. Al-Ansari2
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DOI:10.17265/1934-7359/2017.08.005
Affiliation(s)
1. Department of Civil Engineering, Al-Mustansiriayah University, Baghdad 1001, Iraq;
2. Department of Civil, Environmental and Natural Resources Engineering, Lulea University of Technology, 97187 Lulea, Sweden
ABSTRACT
The flow over broad-crested
weirs was simulated by computational fluid dynamic model. The water surface
profile over broad crested weir was measured in a laboratory model and
validated using two and three dimensional Fluent programs. The Reynolds Averaged Navier-Stokes equations coupled with
the turbulent standard (k-ε) model and volume of fluid method were
applied to estimate the water surface profile. The results of numerical model
were compared with experimental results to evaluate the ability of model in
describing the behaviour of water surface profile over the weir. The results
indicated that the 3D required more time in comparison with 2D results and the
flow over weir changed from subcritical flow at the upstream (U/S) face of weir
to critical flow over the crest and to supercritical flow at downstream (D/S).
A reasonable agreement was noticed between numerical results and experimental
observations with mean error less than 2 %.
KEYWORDS
Broad-crested weir, discharge coefficient, subcritical flow, numerical CFD, Fluent.
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