Measurements of the flow over a low-aspect-ratio cylinder mounted on a ground plane |
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| Authors: | R J Pattenden S R Turnock X Zhang |
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| Institution: | (1) School of Engineering Sciences, University of Southampton, Southampton, Highfield, SO17 1BJ, UK;(2) Present address: School of Civil Engineering and the Environment, University of Southampton, Southampton, UK |
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| Abstract: | The flow over a finite-height cylinder of aspect ratio 1, with one end mounted on a ground plane and the other end free, has been studied by means of surface flow visualisation, particle image velocimetry (PIV) and surface pressure measurements. The diameter-based Reynolds number was 200,000. The mean flow topology has been identified in three areas: the horseshoe vortex system, the separated flow over the free-end and the wake region. Evidence is shown for the existence of a three-horseshoe vortex system, while the mean flow over the free-end consists of an arch vortex with its bases on the forward half of the free-end. There are two tip vortices coming off the free-end. The wake region is found to be highly unsteady, with considerable variation from the mean flow. |
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