Rouzès, Maxime and Moulin, Frédéric Y.
and Florens, Emma
and Eiff, Olivier
Low relative-submergence effects in a rough-bed open-channel flow.
(2018)
Journal of Hydraulic Research, 56. 1-28. ISSN 0022-1686
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(Document in English)
PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 16MB |
Official URL: https://doi.org/10.1080/00221686.2018.1478894
Abstract
Multi-plane stereoscopic PIV measurements were performed in an open-channel flume fitted with cubes to investigate very low submergence ratios, h/k = {1.5, 2, 3}, where h is the water depth and k the roughness height. The spatial standard deviation of the mean flow components reveals that the extent of the roughness sublayer increases drastically with the decrease in h/k to span the entire water column for the lowest h/k investigated. Despite this, the logarithmic law is still observed on the double-averaged velocity profiles for all h/k, first with a fixed von Kármán constant κ and, second, via the indicator function where κ is a free parameter. Also, the longitudinal and vertical normal stresses indicate a universal boundary layer behaviour independent of h/k. The results suggest that the logarithmic and wake-defect laws can still be applied at such low h/k. However, the lateral normal stress depends on h/k in the range investigated as well as on the geometry of the roughness pattern.
Item Type: | Article |
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HAL Id: | hal-02135758 |
Audience (journal): | International peer-reviewed journal |
Uncontrolled Keywords: | |
Institution: | French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE) Other partners > Karlsruhe Institute of Technology - KIT (GERMANY) Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE) |
Laboratory name: | |
Funders: | Research infrastructures Hydralab - Agence National de la Recherche (ANR) |
Statistics: | download |
Deposited On: | 20 Mar 2019 07:52 |
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