IDEAS home Printed from https://ideas.repec.org/a/eee/renene/v246y2025ics0960148125005804.html
   My bibliography  Save this article

Effect of spacing ratio on FIV response of multiple cylindrical oscillators supported by maglev

Author

Listed:
  • Bai, Xu
  • Zhang, Wen
  • Wang, Jialu
  • Yang, Zhenbang

Abstract

Utilizing flow-induced vibrations for low-velocity ocean current energy generation is effective. Replacing metal springs with magnetic levitation systems to support the oscillators offers advantages such as easy stiffness adjustment and better underwater maintenance. This makes it significant for flow-induced ocean current energy harvesting. A multi-oscillator design can further enhance energy output capacity, but the mutual interference between oscillators results in vibration responses that differ significantly from those of a single oscillator. This paper employs the RANS method and equivalent magnetic charge methods to develop a coupled model of FIV of rigid cylindrical oscillators supported by magnetic levitation. Numerical simulations analyze the effect of spacing ratio on oscillation amplitude ratio, vibration frequency, and vortex shedding patterns. The results show that in double tandem cylindrical oscillators with identical diameters supported by magnetic levitation, the spacing ratio significantly affects the vibration response of the upstream and downstream oscillators. Under the characteristics of the magnetic spring, the interference between upstream and downstream oscillators is stronger with a small spacing ratio, leading to peak amplitude ratios even at moderate to low flow velocities. When G/D = 2 and U = 0.5 m/s, the downstream oscillator reaches a maximum amplitude ratio of A* = 1.06, 2.26 times that of a single oscillator at the same flow velocity. In three tandem cylindrical oscillators with identical diameters supported by magnetic levitation, the vibration response fluctuates more than in the two-oscillator case, exhibiting distinct three-stage branching characteristics. With G1/D = 2 fixed, when G2/D = 2 and U = 0.6 m/s, the downstream oscillator reaches a maximum amplitude ratio of A* = 1.2, 2.45 times that of a single oscillator at the same flow velocity. Vortex analysis indicates that under appropriate spacing ratios and flow conditions, the interference among multiple oscillators is amplified, enabling the downstream oscillators to better absorb and utilize the coherent vortices from the upstream oscillators, thus optimizing the vibration response.

Suggested Citation

  • Bai, Xu & Zhang, Wen & Wang, Jialu & Yang, Zhenbang, 2025. "Effect of spacing ratio on FIV response of multiple cylindrical oscillators supported by maglev," Renewable Energy, Elsevier, vol. 246(C).
    • Handle: RePEc:eee:renene:v:246:y:2025:i:c:s0960148125005804
    DOI: 10.1016/j.renene.2025.122918
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0960148125005804
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.renene.2025.122918?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:renene:v:246:y:2025:i:c:s0960148125005804. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/renewable-energy .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.