Abstract
The surface shear stress, mean velocity, turbulence intensities and Reynolds shear stress have been measured in the boundary layer developing over a mesh type rough surface. The results confirm the conclusions of Perry et al. (1983) than an improved measurement of the Reynolds shear stress in the near-wall region is obtained by increasing the included angle of the X-wire probe from 90° to 120°. Direct measurement of the wall shear stress using a floating element also confirm the conclusion of Perry et al. that the value estimated from the Hama defect law is about 20% too high. The roughness function Δu/u τ determined from mean velocity profiles indicates an equivalent sand grain roughness for the mesh surface of about ten times the centre line average roughness length.
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