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Eighth International Symposium on Turbulence and Shear Flow Phenomena
August, 28-30, 2013, Poitiers, Futuroscope, France

DOI: 10.1615/TSFP8

TIME-RESOLVED RECONSTRUCTION OF SUPER-STREAKS IN HIGH REYNOLDS NUMBER TURBULENT BOUNDARY LAYER OVER A FLAT PLATE

pages 1-7
DOI: 10.1615/TSFP8.50
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要約

A methodology for examination of super-structures in a zero pressure gradient boundary layer at Reynolds number of 10000 is presented. These structures are characterised by a large degree of persistence and are thought to participate actively to the turbulence regeneration in near-wall region (Mathis et al., 2011). A time-resolved estimate of the three-dimensional structure of these entities is obtained by combining low-speed two-dimensional stereo-PIV (Particle Image Velocimetry) and a two-dimensional rake of 143 single hot-wire probes. The latter is used to animate the PIV data, initially sampled at 4Hz, at a higher sampling rate. This is effected using linear stochastic estimation (LSE) with a multi-time delay formulation. The potential of the methodology for eduction of the very large low-speed streaks and the associated hairpin vortices is discussed.

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