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Defining the roughness sublayer and its turbulent statistics

Florens, Emma and Eiff, Olivier and Moulin, Frédéric Defining the roughness sublayer and its turbulent statistics. (2013) Experiments in Fluids, 54 (4). 1-15. ISSN 0723-4864

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Official URL: http://dx.doi.org/10.1007/s00348-013-1500-z

Abstract

The roughness sublayer in a turbulent openchannel flow over a very rough wall is investigated experimentally both within the canopy and above using particle image velocimetry by gaining complete optical access with new methodologies without disturbing the flow. This enabled reliable estimates of the double-averaged mean and turbulence profiles to be obtained by minimizing and quantifying the usual errors introduced by limited temporal and spatial sampling. It is shown, for example, that poor spatial sampling can lead to erroneous vertical profiles in the roughness sublayer. Then, in order to better define and determine the roughness sublayer height, a methodology based on the measured spatial dispersion is proposed which takes into account temporal sampling errors. The results reveal values well below the usual more ad hoc estimates for all statistics. Finally, the doubleaveraged mean and turbulence statistics in the roughness sublayer are discussed.

Item Type:Article
Additional Information:Thanks to Springer Verlag. The definitive version is available at http://link.springer.com/article/10.1007/s00348-013-1500-z
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 - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Statistics:download
Deposited By: Frederic MOULIN
Deposited On:21 Nov 2013 09:51

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