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Effects of a square bump on hydroenergy harvesting of a cylinder undergoing flow-induced vibrations

Author

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  • Zhao, Yang
  • Mao, Jieyun
  • Qu, Sen
  • Wang, Xikun

Abstract

In this study, 2-dimensional (2D) numerical simulations in two-degree-of-freedom are performed to explore the vibration response and available power characteristics of an elastically-supported circular cylinder with a single square bump on its surface as the passive turbulence control (PTC) method. The bump is mounted at 5 different angles (α = 0°, 45°, 90°, 135°, 180°) from the leading edge on the cylinder surface. As compared to the bare cylinder, the dynamic response and output power of the bumped cylinder are enhanced evidently, especially for α = 45°, 90° and 135° due to the asymmetric structure leading to the coupling between vortex-induced vibration (VIV) and galloping. For α = 90°, the bumped cylinder could achieve a maximum harnessed power of 2.76 mW, representing a remarkable improvement of 393% than the bare cylinder. The vortex-shedding patterns are described in detail to reveal the underlying fluid-structure interaction mechanism.

Suggested Citation

  • Zhao, Yang & Mao, Jieyun & Qu, Sen & Wang, Xikun, 2025. "Effects of a square bump on hydroenergy harvesting of a cylinder undergoing flow-induced vibrations," Renewable Energy, Elsevier, vol. 240(C).
    • Handle: RePEc:eee:renene:v:240:y:2025:i:c:s0960148124022572
    DOI: 10.1016/j.renene.2024.122189
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