Abstract
Some features of the inner region of a flat plate turbulent boundary layer are investigated by a Digital Particle Image Velocimetry technique. Measurements in planes parallel to the wall are examined. The energetic spanwise modes of the streaky motions are analysed by spatial Fourier analysis at different distances from the wall. Internal shear layers are deduced by applying VISA technique at y +=20 and detected events are ensemble averaged. The deduced flow structure highlights the dominant spatial relationship between low-speed streak and internal shear layer motions.
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