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- W2322351331 abstract "An alternate two layers theory, based on new scalings for transitional wall roughness variables, is presented for large appropriate Reynolds numbers. The roughness velocity and roughness coordinate in the wall layer, based on a new non-dimensional roughness scale, are introduced as fundamental scales, so that just above the wall roughness level, the mean velocity and Reynolds stress do not depend on surface roughness. Two new numbers termed as roughness friction Reynolds number and roughness Reynolds number also arise that describes the transitional wall roughness effects in turbulent boundary layers. For velocity profile the matching of inner and outer layers in the overlap region, by IzaksonMillikan-Kolmogorov hypothesis, gives the functional equations whose functional solutions are universal log laws, as well as power laws, for all types of roughness, having same constants as in smooth wall case. These predictions do not explictly depend of transitional wall roughness. The skin friction, in traditional variables, is predicted by a single relation for inflectional type of Nikuradse roughness for sand grain type roughness data and Colebrook commercial monotonic roughness. Another, prediction of skin fiction for k-type & d-type roughness is also obtained. The extensive experimental data for various types of wall transitional roughness provide very good support to present theory of universal log laws as well as new predictions in traditional log law proposed here for sand grain and k- & d- type roughness. The experimental data from various sources provides the strong support to the new scaling for log law and power law." @default.
- W2322351331 created "2016-06-24" @default.
- W2322351331 creator A5049144047 @default.
- W2322351331 date "2006-06-05" @default.
- W2322351331 modified "2023-10-16" @default.
- W2322351331 title "Turbulent Boundary Layers on Transitional Rough Surfaces: New Approach to Universal Scaling" @default.
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- W2322351331 doi "https://doi.org/10.2514/6.2006-2886" @default.
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