Abstract
The effect of wall adaptation on flow development over a circular cylinder was investigated in an adaptive-wall wind tunnel. Flow over a circular cylinder with model blockage ratio of 17% was characterized via hot-wire velocity measurements and timeresolved surface pressure measurements. Measurements were made in three wall configurations: geometrically straight walls (GSW), aerodynamically straight walls (ASW), and streamlined walls (SLW). In GSW, the measured pressure drag was significantly greater than that obtained in SLW, which matched published experimental results at low blockage ratios. Blockage effects in GSW, such as flow acceleration and wake blockage, were reduced in ASW and even more so in the SLW configuration. The increase in Strouhal number observed in GSW and ASW was rectified to the expected value in SLW. The results suggest that while both the vortex shedding frequency and the shear layer instability frequency were higher in GSW due to blockage effects, the ratio of these frequencies was constant in all the wall configurations investigated.
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