The flow in a streamwise/wall-normal plane of a turbulent boundary layer at moderate Reynolds number (Re θ = 2,200) is characterized using two stereo PIV systems just overlapping in the streamwise direction. The aim is to generate SPIV data for near-wall turbulence with enough spatial dynamic range to resolve most of the coherent structures present in the flow and to facilitate future comparisons with direct numerical simulations. This is made possibly through the use of four cameras with large CCD arrays (4,008 px × 2,672 px) and through a rigorous experimental procedure designed to minimize the impact of measurement noise on the resolution of the small scales. For the first time, both a large field of view [S x ; S y ] = [2.6δ; 0.75δ] and a high spatial resolution (with an interrogation window size of 13.6+) have been achieved. The quality of the data is assessed through an analysis of some of the statistical results such as the mean velocity profile, the rms and the PDF of the fluctuations, and the power spectra.
Experiments in Fluids – Springer Journals
Published: Jul 8, 2008
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