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Influence of control cylinder placement on vortex shedding from a circular cylinder

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Abstract

Modifications to the vortex-shedding dynamics from a circular cylinder of diameter D are investigated experimentally in a free-surface water channel at \(Re_D\)=9500. The vortex shedding is modified via the placement of a control cylinder of diameter D/8 in the vicinity of the main cylinder. A methodology is presented to link changes in the wake dynamics and loading on the main cylinder. The analysis combines fourier model decomposition, proper orthogonal decomposition, and phase averaging. Based on differences in the wake dynamics, the influence of the control cylinder can be classified according to its placement: (1) in the free stream outside the main cylinder shear layer; (2) within the main cylinder shear layer; (3) in the recirculation region. While fluctuating lift is significantly reduced in all the cases, the mean and fluctuating drag are affected differently.

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Notes

  1. Ideally, the energy content \(\lambda _i/2=\overline{a_i^2/2}\) for each mode of a harmonic pair should be identical. The small difference (37% vs 32.3%) can be attributed to the truncation of the mode due to the finite PIV observation window.

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Acknowledgements

We acknowledge the financial support of Natural Sciences and Engineering Research Council (NSERC) (Grant nos. 04079, 03660-2014) of Canada through the Strategic Project Grant (SPG) programme. We also acknowledge contributions from the Canada Foundation for Innovation (Grant no. 34707) for supporting the procurement of the PIV system used to collect data for this manuscript.

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Authors and Affiliations

  1. Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada

    Conrad Bingham, Chris Morton & Robert J. Martinuzzi

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  1. Conrad Bingham
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  2. Chris Morton
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  3. Robert J. Martinuzzi
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Correspondence to Conrad Bingham.

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Bingham, C., Morton, C. & Martinuzzi, R.J. Influence of control cylinder placement on vortex shedding from a circular cylinder. Exp Fluids 59, 158 (2018). https://doi.org/10.1007/s00348-018-2615-z

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  • DOI: https://doi.org/10.1007/s00348-018-2615-z

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