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

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.
Hydraulics; one-dimensional flow; review; sediment bed; stream flow; von Karman constant
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/155737
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