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Influence of free-surface on wake flow characteristics of a torpedo-like geometry

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Abstract

In the present work, the flow topologies of a generalized torpedo-like geometry were investigated experimentally via Particle Image Velocimetry (PIV) and dye visualization. The study was conducted at length based on the Reynolds number of Re = 20 × 103 and 40 × 103. The torpedo-like geometry was positioned at ratios of immersion between 0.50 ≤ h/D ≤ 3.50 to investigate the free-surface effect on the present results, comparatively. PIV measurements provided ensemble-averaged velocity fluctuations, turbulent kinetic energy and Reynolds stress correlation with spectral analysis of the vortex-shedding mechanism. It is observed that different vortex shedding mechanism occurs depending on the immersion ratio. At h/D = 0.5, wake flow is characterized by the lower shear layer while upper shear layer dominates it at h/D = 0.75 and 1.00. The influence of the free-surface on flow characteristics is found to be negligible at h/D > 2.00 for both Reynolds numbers. Alternating vortex shedding occurs and the wake regions at h/D = 3.5 became nearly symmetrical. The size of the wake zone is moved closer to the stern of the torpedo-like geometry at Re = 40 × 103 and causes a smaller recirculating region. Spectral analysis of the streamwise velocity revealed a decreasing trend of Strouhal number with increasing immersion ratios. The changing of the Strouhal number showed a significant increase at h/D = 0.75 for Re = 20 × 103 an ever-decreasing trend for Re = 40 × 103.

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Acknowledgements

The authors would like to acknowledge the Scientific and Technological Research Council of Turkey (TUBITAK) under Contract No. 214M318 and Cukurova University Scientific Research Project Coordinators (BAP) under Contract No. FYL-2019-11596. It is a pleasure to thank the Mechanical Engineering Department of Cukurova University and the Advanced Fluid Mechanics PIV laboratory of Osmaniye Korkut Ata University, Turkey for letting the authors conduct this experimental work.

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türkiye bilimsel ve teknolojik araştirma kurumu,214M318,Muammer Ozgoren

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Authors and Affiliations

  1. Department of Mechanical Engineering, Engineering Faculty, Cukurova University, Adana, 01330, Turkey

    A. Kilavuz, F. Sarigiguzel & H. Akilli

  2. Department of Aerospace Engineering, Aeronautics and Astronautics Faculty, Adana Alparslan Turkes Science and Technology University, Adana, 01250, Turkey

    T. Durhasan

  3. Department of Aeronautical Engineering, Aviation and Space Faculty, Necmettin Erbakan University, Konya, 42140, Turkey

    M. Ozgoren

  4. Department of Mechanical Engineering, Engineering Faculty, Istanbul Aydin University, Istanbul, 34295, Turkey

    B. Sahin

  5. Department of Mechanical Engineering, Istanbul Technical University, Istanbul, 34437, Turkey

    L. A. Kavurmacioglu

  6. Department of Energy Systems Engineering, Engineering Faculty, Osmaniye Korkut Ata University, Osmaniye, 80000, Turkey

    E. Sekeroglu & B. Yaniktepe

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  1. A. Kilavuz
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Correspondence to T. Durhasan.

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Kilavuz, A., Durhasan, T., Ozgoren, M. et al. Influence of free-surface on wake flow characteristics of a torpedo-like geometry. J Mar Sci Technol 27, 1130–1147 (2022). https://doi.org/10.1007/s00773-022-00893-7

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