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Seventh International Symposium on Turbulence and Shear Flow Phenomena
July, 28-31, 2011, Ottawa Convention Centre, Ottawa, Canada

DOI: 10.1615/TSFP7

TURBULENCE STRUCTURE OVER ALIGNED AND INCLINED RIBS IN ADVERSE PRESSURE GRADIENT

pages 1-6
DOI: 10.1615/TSFP7.1370
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RESUMO

This paper reports an experimental study of fully developed channel and adverse pressure gradient (APG) turbulent flows over transverse square ribs inclined at 90° and 45° to the approach flow. A particle image velocimetry (PIV) system was used to conduct velocity measurements in the streamwise-wall-normal plane in order to study the structural features of the flow over these rib configurations as well as the effects of APG on the flow. The results demonstrate that APG enhanced turbulence level compared to the fully developed channel flow. On the other hand, the 45° ribs decreased drag compared to 90° ribs. The two-point velocity correlations revealed that the inclination as well as the size of the hairpin packets varies with rib inclination and pressure gradient.

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