ENERGY HARVESTING BY VORTEX-INDUCED VIBRATIONS OF STRUCTURES WITH DIFFERENT CROSS-SECTIONS

Ussama Ali, Md Islam, Isam Janajreh

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    1 Scopus citations

    Abstract

    The shape of the structure plays a crucial role in determining its vibration characteristics, such as the amplitude and frequency of vibration. The purpose of this investigation is to explore how the flow-induced vibration behavior and energy harvesting potential are impacted by the cross-sectional shape of a structure. In this work, the cross-sectional shapes of the bluff body considered are circular, square, diamond, and triangle. The reduced velocity (Ur) is varied in the range of 2 – 12. The mass ratio is taken as 1.7, and the damping ratio as 0.016. The hydraulic diameter for all the shapes is kept constant, and the Reynolds number based on the hydraulic diameter is varied in the range of 1.7×104 to 10.3×104 to mimic the flow velocity of the water current in the ocean (0.19 – 1.14 m/s). In this work, water is considered as the flowing fluid, which is supposed to be incompressible and viscous. The flow dynamics of the fluid over a bluff body are described using the unsteady Reynolds Averaged Navier-Stokes equations, and the turbulence is modeled through the SST k–ω turbulence model. Based on the findings, it can be concluded that the shape of the bluff body has a significant impact on both the vibration characteristics, the output power, and the efficiency of energy harvesting. The analysis suggests that circular shapes are ideal for energy harvesting from flow-induced vibrations at low Ur, while diamond shapes are most suitable at high Ur. In this study, the maximum output power of 1.57 W was obtained with a diamond-shaped structure at Ur = 10. Whereas the maximum efficiency of 9.01% was obtained through the circular structure at Ur = 4.

    Original languageBritish English
    Title of host publicationDynamics, Vibration, and Control
    PublisherThe American Society of Mechanical Engineers(ASME)
    ISBN (Electronic)9780791887639
    DOIs
    StatePublished - 2023
    EventASME 2023 International Mechanical Engineering Congress and Exposition, IMECE 2023 - New Orleans, United States
    Duration: 29 Oct 20232 Nov 2023

    Publication series

    NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
    Volume6

    Conference

    ConferenceASME 2023 International Mechanical Engineering Congress and Exposition, IMECE 2023
    Country/TerritoryUnited States
    CityNew Orleans
    Period29/10/232/11/23

    Keywords

    • Bluff bodies
    • Energy Harvesting
    • Flow-induced vibrations
    • Sustainable Energy
    • Vortex shedding

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