Abstract
The logarithmic velocity region is studied in zero-pressura-gradient turbulent boundary layers on the rough wall. We have already proposed the definition of log-law region in the case of smooth wall with using the probability density of velocity fluctuation. In this report this idea is expanded into the rough wall boundary layers, and extracted log-law region is discussed from the point of PDF profiles, and also its Reynolds number dependence is studied based on the experimental data.
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