Suscripción a Biblioteca: Guest
Seventh International Symposium on Turbulence and Shear Flow Phenomena
July, 28-31, 2011, Ottawa Convention Centre, Ottawa, Canada

DOI: 10.1615/TSFP7

ADVERSE PRESSURE GRADIENT TURBULENT FLOWS OVER TWO-DIMENSIONAL SQUARE RIBS

pages 1-6
DOI: 10.1615/TSFP7.660
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SINOPSIS

A fully developed channel turbulent flow and an adverse pressure gradient (APG) turbulent flow over smooth and rough walls have been studied using a particle image velocimetry (PIV) technique. The rough walls comprised two-dimensional transverse square ribs of height, k = 3 and pitch, p = 2k, 4k and 8k. It was found that APG and wall roughness enhanced turbulence level compared to the fully developed channel flow. A reduction in friction coefficient was observed for the APG flow in contrast to an increase by roughness. Quadrant analysis demonstrated that Q2 and Q4 events occurred more frequently, and contributed more to the production of the Reynolds shear stress than Q1 and Q3 events. Two-point velocity correlations revealed that the inclination and size of the hairpin packets vary with boundary condition and pressure gradient.

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