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Measurements of the flow over a low-aspect-ratio cylinder mounted on a ground plane

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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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Acknowledgements

The work described in this paper was supported by a PhD studentship from the School of Engineering Sciences, University of Southampton, United Kingdom.

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  1. R. J. Pattenden

    Present address: School of Civil Engineering and the Environment, University of Southampton, Southampton, UK

Authors and Affiliations

  1. School of Engineering Sciences, University of Southampton, Southampton, Highfield, SO17 1BJ, UK

    R. J. Pattenden, S. R. Turnock & X. Zhang

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  1. R. J. Pattenden
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  2. S. R. Turnock
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  3. X. Zhang
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Correspondence to S. R. Turnock.

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Pattenden, R.J., Turnock, S.R. & Zhang, X. Measurements of the flow over a low-aspect-ratio cylinder mounted on a ground plane. Exp Fluids 39, 10–21 (2005). https://doi.org/10.1007/s00348-005-0949-9

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