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Fundamental Issues and Canonical Flows

Investigation of Dam-Break Flow Over Abruptly Contracting Channel With Trapezoidal-Shaped Lateral Obstacles

[+] Author and Article Information
Hatice Ozmen-Cagatay1

Civil Engineering Department,  Cukurova University, 01330 Adana, Turkeyhatmen@cu.edu.tr

Selahattin Kocaman

Civil Engineering Department,  Mustafa Kemal University, İskenderun, Turkeyskocaman@mku.edu.tr

1

Corresponding author.

J. Fluids Eng 134(8), 081204 (Aug 09, 2012) (7 pages) doi:10.1115/1.4007154 History: Received July 08, 2011; Revised May 15, 2012; Published August 09, 2012; Online August 09, 2012

The present paper aims to investigate the dam-break flow over dry channel with an abrupt contracting part in certain downstream section. A new experiment was carried out in a smooth-prismatic channel with rectangular cross section and horizontal bed. A digital imaging technique was adopted for flow measurement and thus flood wave propagation was sensitively obtained. Synchronous filmed images of the dam-break flow were nonintrusively acquired with three cameras, through glass sidewalls of the channel. Free surface profiles and time evolution of water levels were derived directly from the recorded video images using virtual wave probe without disturbing the flow. Furthermore, the present study highlights the formation and propagation of the negative bore due to abruptly contracting channel. The measured results were compared with the numerical solution of Reynolds averaged Navier–Stokes (RANS) equations with k-ε turbulence model and good agreement was achieved. New experimental data can be useful for scientific community to validate numerical models.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Test facility (a) section view A-A, (b) plan view, lengths in (cm)

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Figure 2

(a) Calibration images at different distances and angles (b) calculated 3D positions and directions of the calibrated grids with respect to the camera

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Figure 3

Calibration of radial distortions (a) raw image (b) calibrated image

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Figure 4

Filmed images of flow (a) raw image (b) usage of virtual probes after filtering and sharpening

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Figure 5

(a) Formation of negative bore (b) propagation of negative bore

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Figure 6

Comparison between numerical and experimental free surface profiles over time

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Figure 7

Distance versus computed local Froude numbers at t = 2.8 s

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Figure 8

Sketch of the digital imaging measurement positions (plan view), lengths in (cm)

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Figure 9

Comparison between numerical and experimental stage hydrographs at selected locations

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