Non-universality of von Kármán's κ in fluvial streams
- 22 October 2010
- journal article
- research article
- Published by Taylor & Francis Ltd in Journal of Hydraulic Research
- Vol. 48 (5), 658-663
- https://doi.org/10.1080/00221686.2010.507338
Abstract
A distinguished universal aspect of wall-bounded turbulent flows is Theodore von Kármán's universal logarithmic law (log-law) of the wall, describing the time-averaged streamwise velocity variation with distance from the wall. The log-law has a universal von Kármán constant κ governing the velocity gradient. There remain a number of cases of the non-universality of κ in fluvial streams. In particular, it behaves as a variable in flows with low submergence, or if there is bed- and suspended-load transport. This research focuses on the non-universality of κ raising various issues and inviting future research directions.Keywords
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