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On the limits of wavy cylinder wavelength and amplitude for effective wake and vortex-shedding control

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Abstract

An experimental time-resolved particle-image velocimetry study was conducted on wavy cylinders possessing wavelength (λ) and amplitude (a) combinations that are significantly different from earlier studies at ReDm = 2700. Results show that vortex formation length increases as the wavelength decreases from λ/Dm = 2.4 to 1.2, but decreases when the latter decreases to λ/Dm = 0.6. Amplitude increments lead to significant vortex formation length growths and reductions at the saddles/nodes of λ/Dm = 2.4 and 1.2 wavy cylinders, respectively. In contrast, λ/Dm = 0.6 wavy cylinders produce significantly shorter vortex formation lengths like a baseline cylinder, regardless of amplitude. Regular reversed flow “lobes” are observed for λ/Dm = 2.4 and 1.2 wavy cylinders, but not λ/Dm = 0.6 ones, which lead to variations in the spanwise vortex formation lengths. Proper orthogonal decomposition (POD) analysis shows that only a/Dm = 0.4, λ/Dm = 0.6 wavy cylinder has the same vortex-shedding frequency as the baseline cylinder. Other POD results also demonstrate that the vortex-shedding behaviour between λ/Dm = 0.6 wavy and baseline cylinder is very similar. The present study shows that there exists a minimal wavelength below which that coherent streamwise vortices will not be produced and wake control benefits of wavy cylinders will be considerably reduced.

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The supporting data for the findings can be obtained from the corresponding author upon reasonable request.

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Acknowledgements

The authors acknowledge the support for this study by the School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, and the Higher Education Sprout Project of the National Yang Ming Chiao Tung University and Ministry of Education (MOE), Taiwan.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore

    T. H. New

  2. Department of Aerospace Engineering, University of Bristol, BS8 1TR, Bristol, United Kingdom

    H. D. Lim

  3. Department of Mechanical Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan, 30010, Republic of China

    C. H. Chen & K. B. Lua

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  1. T. H. New
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  2. H. D. Lim
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  3. C. H. Chen
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  4. K. B. Lua
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Correspondence to K. B. Lua.

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New, T.H., Lim, H.D., Chen, C.H. et al. On the limits of wavy cylinder wavelength and amplitude for effective wake and vortex-shedding control. J Mar Sci Technol 28, 597–614 (2023). https://doi.org/10.1007/s00773-023-00943-8

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  • DOI: https://doi.org/10.1007/s00773-023-00943-8

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