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On the structure of turbulent channel flow

Published online by Cambridge University Press:  20 April 2006

Arne V. Johansson  and
P. Henrik Alfredsson
Arne V. Johansson
Affiliation:
Department of Mechanics, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
P. Henrik Alfredsson
Affiliation:
Department of Mechanics, The Royal Institute of Technology, S-100 44 Stockholm, Sweden
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Abstract

Hot-film measurements of the streamwise velocity component were carried out in a fully developed turbulent water-channel flow for three different Reynolds numbers (13800, 34600 and 48900). The results for the first four statistical moments complement and extend the results from previous studies of turbulent channel flow. The VITA variance technique waa employed to detect deterministic events in the streamwise velocity. It waa demonstrated that the VITA technique has a band-pass-filter character. The number of events detected was found to decrerrae exponentially with the threshold level and the events occupy a wide range of timescales. This makes it impossible to define one unique frequency of occurrence or one unique duration of the events. However, by using this technique information was obtained on the amplitude and timescale distributions of the events. The chmacteristic features of the conditional iverages were found to be related to the skewness and flatness factors.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 122 , September 1982 , pp. 295 - 314
Copyright
© 1982 Cambridge University Press

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