In this paper, the flow characteristics around rectangular cylinders with different length to height ratios (aspect ratios, AR) of AR1, AR2, AR3 and AR4 are studied using a particle image velocimetry. The Reynolds number (Re) was 7200 in all cases and the results were analyzed in terms of the mean flow characteristics, Reynolds stresses and triple velocity correlations. The separated flow did not reattach for AR1 and AR2 cylinders. The flow topology around the AR2 cylinder showed a massive wake vortex compared to the other tested cases. The recovery of the mean velocity within the wake region was slowest for AR2, meanwhile, AR3 and AR4 revealed mean reattachment over the cylinder. The magnitudes of the Reynolds stresses and triple velocity correlations were consistently higher along the cylinder centerline for AR1 compared to the other cases.
In the present study, the effects of Reynolds number on the flow characteristics around rectangular cylinders in uniform flow with length-to-height aspect ratios (AR) of 1 and 4 were examined experimentally using particle image velocimetry. High spatial resolution experiments were performed at Reynolds numbers of 3000, 7200, 14700 and 21000 for each aspect ratio. The results show that the separated flow is directly shed into the near wake region for AR1, while mean flow reattachment occurs on AR4, irrespective of the Reynolds number. The characteristics of the primary, secondary and wake vortices formed around the cylinders show dependency on both aspect ratio and Reynolds number. The streamwise mean velocity, turbulence intensities, transport of turbulent kinetic energy by fluctuating velocities in terms of quadrant analyses are also discussed. One-dimensional profiles are presented to quantitatively assess the effects of Reynolds number and aspect ratio.
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