Analysis of the velocity field in a large rectangular channel with lateral shockwave |
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Authors: | M Ben Meftah F De Serio M Mossa A Pollio |
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Institution: | (1) Department of Water Engineering and Chemistry, Technical University of Bari, Via E. Orabona 4, Bari, 70125, Italy;(2) Department of Environmental Engineering and Sustainable Development, Technical University of Bari, Via E. Orabona 4, Bari, 70125, Italy |
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Abstract: | In this work the authors describe the main characteristics of the velocity field of hydraulic jumps in a very large channel
where lateral shockwaves occur. Experiments were carried out at the Coastal Engineering Laboratory of the Water Engineering
and Chemistry Department of the Technical University of Bari (Italy). Extensive flow velocity measurements were investigated
in order to have a clearer understanding of both hydraulic jump development and lateral shockwave formation in a very large
channel. Eight experiments were performed in a 4m wide rectangular channel; the experiments differed in the inlet Froude number
F
0 and the jump type. Seven tests were carried out with undular jumps and one with a roller jump. The flow velocity and the
flow free surface measurements were taken using a two-dimensional Acoustic Doppler Velocimeter (ADV) and an ultrasonic profiler,
respectively. The experimental results can be summarized as follow: (i) the formation of well developed lateral shockwaves
similar to those of oblique jumps were observed; (ii) the comparison of the experimental and theoretical data shows that the
classic shockwave theory is sufficiently confirmed in the analyzed range of Reynolds number, taking into account the experimental
errors and the difference between the theoretical and experimental assumptions; (iii) the transversal flow velocity profiles
in the recirculating zone show a good agreement with the numerical simulations presented in literature in the case of a separated
turbulent boundary layer over a flat plate. This conclusion enables us to confirm the hypothesis that the lateral shockwaves
in the channel are the result of a boundary layer which, as observed, forms on the channel sidewalls. |
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Keywords: | Hydraulic jump Large channel Shockwave Turbulent boundary layer Flat plate Velocity distribution |
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