Abstract
The flow around cylinders of circular, square, and diamond cross-section oscillating in quiescent fluid was studied experimentally using particle image velocimetry (PIV). Phase-averaged measurements of the velocity field were obtained at the maximum-amplitude, zero-amplitude, and intermediate positions of the oscillation cycle. The experiments were performed at low Keulegan-Carpenter numbers, from K? = 1 to 3.5, and for moderate Stokes numbers, from β = 250 to 376. Within this range of KC, the flow patterns remained symmetric about either side of the cylinders. For K? = 1, the flow remained close to the surface of the cylinders throughout the cycle. For K? = 1.5 to 3.5, an attached vortex pair formed behind the circular and square cylinders at the maximum-amplitude position. The distinct geometry of the diamond cylinder, with two fixed separation points, led to a unique but still symmetric vortex pattern.
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Acknowledgments
The authors acknowledge the support of the Natural Sciences and Engineering Research Council (NSERC), the Canada Foundation for Innovation (CFI), and the Innovation and Science Fund of Saskatchewan. The assistance of M.G. Crane, O.J.P. Dansereau, J.L. Heseltine, and Engineering Shops is appreciated.
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Sumner, D., Hemingson, H.B., Deutscher, D.M., Barth, J.E. (2009). PIV Measurements of the Flow Around Oscillating Cylinders at Low KC Numbers. In: Braza, M., Hourigan, K. (eds) IUTAM Symposium on Unsteady Separated Flows and their Control. IUTAM Bookseries, vol 14. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9898-7_1
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DOI: https://doi.org/10.1007/978-1-4020-9898-7_1
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