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 k governing the velocity gradient. There remain a number of cases of the non-universality of k 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 k raising various issues and inviting future research directions.
Non-universality of von Kármán’s k in fluvial streams
GAUDIO, Roberto;
2010-01-01
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 k governing the velocity gradient. There remain a number of cases of the non-universality of k 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 k raising various issues and inviting future research directions.File in questo prodotto:
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