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Frequency-domain hydrodynamic modelling of dense and sparse arrays of wave energy converters

Author

Listed:
  • Wei, Y.
  • Barradas-Berglind, J.J.
  • Yu, Z.
  • van Rooij, M.
  • Prins, W.A.
  • Jayawardhana, B.
  • Vakis, A.I.

Abstract

In this work, we develop a frequency-domain model to study the hydrodynamic behaviour of a floater blanket (FB), i.e., an array of floater elements individually connected to power take-off (PTO) systems, which constitutes the core technology of the novel Ocean Grazer (OG) wave energy converter (WEC). The boundary element method open-source code NEMOH is used to solve the scattering and radiation problem. The aforementioned floater elements that comprise the FB are mechanically interconnected via (cylindrical, revolutional or spring) joints, which add extra constraint equations to the multibody problem. Various scenarios are investigated to understand the hydrodynamic response of the FB. The variation of the capture factor, PTO damping coefficients, q-factor and response amplitude operator (RAO) of each scenario are analysed, in order to quantify the device performance. A new concept based on a negative-stiffness spring joint is proposed to increase the energy output of the FB. Attention is also paid to the anti-resonance that is found in the numerical simulations. This study provides further insight into the hydrodynamic behaviour of dense or sparse interconnected arrays of WECs, which is fundamental for the design and optimisation of the OG-WEC.

Suggested Citation

  • Wei, Y. & Barradas-Berglind, J.J. & Yu, Z. & van Rooij, M. & Prins, W.A. & Jayawardhana, B. & Vakis, A.I., 2019. "Frequency-domain hydrodynamic modelling of dense and sparse arrays of wave energy converters," Renewable Energy, Elsevier, vol. 135(C), pages 775-788.
    • Handle: RePEc:eee:renene:v:135:y:2019:i:c:p:775-788
    DOI: 10.1016/j.renene.2018.12.022
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    References listed on IDEAS

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    1. Sarkar, Dripta & Doherty, Kenneth & Dias, Frederic, 2016. "The modular concept of the Oscillating Wave Surge Converter," Renewable Energy, Elsevier, vol. 85(C), pages 484-497.
    2. Vakis, Antonis I. & Anagnostopoulos, John S., 2016. "Mechanical design and modeling of a single-piston pump for the novel power take-off system of a wave energy converter," Renewable Energy, Elsevier, vol. 96(PA), pages 531-547.
    3. Sinha, Ashank & Karmakar, D. & Guedes Soares, C., 2016. "Performance of optimally tuned arrays of heaving point absorbers," Renewable Energy, Elsevier, vol. 92(C), pages 517-531.
    4. Wei, Y. & Barradas-Berglind, J.J. & van Rooij, M. & Prins, W.A. & Jayawardhana, B. & Vakis, A.I., 2017. "Investigating the adaptability of the multi-pump multi-piston power take-off system for a novel wave energy converter," Renewable Energy, Elsevier, vol. 111(C), pages 598-610.
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    Cited by:

    1. Simone Michele & Federica Buriani & Emiliano Renzi & Marijn van Rooij & Bayu Jayawardhana & Antonis I. Vakis, 2020. "Wave Energy Extraction by Flexible Floaters," Energies, MDPI, vol. 13(23), pages 1-24, November.
    2. Bechlenberg, Alva & Wei, Yanji & Jayawardhana, Bayu & Vakis, Antonis I., 2023. "Analysing the influence of power take-off adaptability on the power extraction of dense wave energy converter arrays," Renewable Energy, Elsevier, vol. 211(C), pages 1-12.

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