The response of a turbulent boundary layer to three different shaped transverse grooves was investigated at two values of momentum thickness Reynolds numbers ( R θ =1000 and 3000). A 20-mm wide square, semicircular and triangular groove with depth to width ( d / w) ratio of unity was used. In general, the effects of the grooves are more significant at the higher R θ , with the most pronounced effects caused by the square groove. An increase in wall shear stress τ w was observed just downstream of the groove for all three shapes. The increase in τ w is followed by a small decrease in τ w below the smooth-wall value before it relaxes back to the corresponding smooth-wall value at x / δ 0≈3. At the higher R θ , the maximum increase in τ w for the square groove is about 50% higher than for the semicircular groove and almost twice that for the triangular groove. The effect of the square groove on U / U 0, u ′/ U 0 and v ′/ U 0 is much more significant than the effect of the semicircular and triangular grooves. There is an increase in the bursting frequency ( f B +) on the grooved-wall compared to the smooth-wall case. The distribution of f B + downstream of the different shaped grooves is similar to the τ w distribution.
Experiments in Fluids – Springer Journals
Published: Aug 16, 2003
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