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Artikel
The streamwise turbulence intensity - a comparison between smooth and rough wall turbulent boundary layers
| Författare: |
Segalini, A. S., Örlü, R., Castro, I.P., Alfredsson, P.H. |
| Dokumenttyp: |
Konferens |
| Tillstånd: |
Publicerad |
| Tidskrift: |
Progress in Turbulence V, Springer Proceedings in Physics, Proceedings of the iTi Conference in Turbulence 2012 |
| Volym: |
149
97-101 |
| År: |
2014 |
AbstractClear differences in turbulence intensity profiles in smooth, transitional and fully rough zero-pressure gradient boundary layers are demonstrated, using the diagnostic plot. A wide range of published data is considered and all zero-pressure gradient boundary layers yield outer flow u'/U values which are roughly linearly related to U/U_inf?, just as for smooth walls, but with a significantly higher slope. The difference in slope is due largely to the influence of the roughness parameter (Delta U+? in the usual notation) and all the data can be fitted empirically by using a modified form of the scaling, dependent only on Delta U/U_inf. It is observed that the turbulence intensity, at a location in the outer layer where U/U_inf? is fixed, rises monotonically with increasing DeltaU/U_inf regardless of the roughness morphology.
http://dx.doi.org/10.1007/978-3-319-01860-7_16
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