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The study investigates shear stress changes due to flow over a roughened surface, suggesting new insights into fluid dynamics.
In a deep, turbulent flow with negligible advection, flowing over a surface roughened by regularly spaced, two-dimensional roughness elements, measured Reynolds shear stress decreased as the surface was approached. The depth of the region of shear-stress deficit was of the order of ten element spacings. Streamwise variations in mean velocities were unable to account for the magnitude of the shear-stress deficit, and the log-law estimate of surface shear disagreed with that measured directly by a drag balance. The data are presented as further information on a puzzling phenomenon.
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P. J. Mulhearn (1978) studied this question.
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