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Open AccessArticle

Experimental and Numerical Analysis of a Dam-Break Flow through Different Contraction Geometries of the Channel

1
Department of Civil Engineering, Iskenderun Technical University, Iskenderun 31200, Turkey
2
Civil and Mechanical Engineering Department, University of Cassino and Southern Lazio, 03043 Cassino (FR), Italy
3
Department of Civil Engineering, Cukurova University, Adana 01330, Turkey
4
Department of Civil Engineering, University of Salerno, 84084 Fisciano, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(4), 1124; https://doi.org/10.3390/w12041124
Received: 1 March 2020 / Revised: 12 April 2020 / Accepted: 12 April 2020 / Published: 15 April 2020
(This article belongs to the Section Hydraulics and Hydrodynamics)
Dam-break wave propagation usually occurs over irregular topography, due for example to natural contraction-expansion of the river bed and to the presence of natural or artificial obstacles. Due to limited available dam-break real-case data, laboratory and numerical modeling studies are significant for understanding this type of complex flow problems. To contribute to the related field, a dam-break flow over a channel with a contracting reach was investigated experimentally and numerically. Laboratory tests were carried out in a smooth rectangular channel with a horizontal dry bed for three different lateral contraction geometries. A non-intrusive digital imaging technique was utilized to analyze the dam-break wave propagation. Free surface profiles and time variation of water levels in selected sections were obtained directly from three synchronized CCD video camera records through a virtual wave probe. The experimental results were compared against the numerical solution of VOF (Volume of Fluid)-based Shallow Water Equations (SWEs) and Reynolds-Averaged Navier-Stokes (RANS) equations with the k-ε turbulence model. Good agreements were obtained between computed and measured results. However, the RANS solution shows a better correspondence with the experimental results compared with the SWEs one. The presented new experimental data can be used to validate numerical models for the simulation of dam-break flows over irregular topography. View Full-Text
Keywords: contraction; dam-break; unsteady flow; RANS; SWEs; CFD contraction; dam-break; unsteady flow; RANS; SWEs; CFD
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MDPI and ACS Style

Kocaman, S.; Güzel, H.; Evangelista, S.; Ozmen-Cagatay, H.; Viccione, G. Experimental and Numerical Analysis of a Dam-Break Flow through Different Contraction Geometries of the Channel. Water 2020, 12, 1124.

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