The mean velocity, Reynolds stress, and mean vorticity regions of a separated shear layer over a surface mounted block are investigated by 2D Digital Particle Image Velocimetry (DPIV) for three Reynolds numbers (, , and ) and two channel-to-block height ratios ( and ). The recirculation region’s height and length are determined for the separated shear layer by means of contours. It is observed that the high Reynolds stress regions lay just outside of the contours. The flow visualization and DPIV measurement of vorticity indicate that the differing normalized Reynolds stresses between and 1000 are most probably due to the initiation of the vortex shedding between these two Reynolds numbers while, differences are minimal between and 2500. A sign change in the Reynolds shear stress distribution of the separated shear layer near the leading edge of the block was recognized for every Reynolds number and channel width.
Mean and Fluctuating Velocity Characteristics of a Separated Shear Layer Past a Surface Mounted Block
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Özkol, Ü., Wark, C., and Fabris, D. (August 5, 2006). "Mean and Fluctuating Velocity Characteristics of a Separated Shear Layer Past a Surface Mounted Block." ASME. J. Fluids Eng. February 2007; 129(2): 200–208. https://doi.org/10.1115/1.2409359
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