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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

A SIMULTANEOUS PHYSICAL AND SPECTRAL ANALYSIS OF THE TURBULENT BOUNDARY LAYER VIA TIME-RESOLVED PARTICLE IMAGE VELOCIMETRY

pages 1-6
DOI: 10.1615/TSFP7.50
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ABSTRACT

In this study, time-resolved particle image velocimetry (PIV) was performed in wall-parallel planes to investigate both the time evolution of structures in the flow as well as the 3D spatio-temporal spectrum. In particular vortex signatures in wall-parallel planes were studied which were found to correspond closely with the signature of hairpin vortices found in wall-bounded shear flows. Considering the convection velocity of different streamwise-spanwise scale pairs calculated from the spatio-temporal spectrum, it was found that the average convection velocity of highly energetic scales in the range 1.5 < λx/δ < 5.0 and 0.5 < λz/δ < 1.0 was close to the convection velocity of the vortex signatures. Also, this range of wavelengths is similar in size to the streamwise-elongated structures around which these vortices often appear.

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