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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

CROSS-FLOW STEREO PIV MEASUREMENTS IN WALL TURBULENCE

pages 1-6
DOI: 10.1615/TSFP7.270
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RESUMO

Wide field of view stereo PIV measurements were conducted in the wall-normal-spanwise plane of fully-developed turbulent channel flow. These experiments represent a significant challenge to the stereo PIV method as the dominant velocity component was oriented normal to the PIV measurement plane while the in-plane components were predominantly much weaker turbulent fluctuations. Nevertheless, these measurements agreed well with DNS results at a similar Reynolds number, both in the mean streamwise velocity as well as the Reynolds normal and shear stresses, which validated the experimental methodology employed. Inspection of instantaneous velocity fields in this cross plane uncovered the spatial signatures of low- and high-momentum regions, the former of which have been previously linked to hairpin vortex packets in the outer layer of wall turbulence. POD was employed to study the spatial characteristics of the large-scale motions further and revealed a significant spanwise coherence in the form of alternating low- and high-momentum regions well beyond that reflected in two-point velocity correlations.

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