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Analysis of the hydrodynamics of four different oscillating wave surge converter concepts

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  • Gunawardane, S.D.G.S.P.
  • Folley, M.
  • Kankanamge, C.J.

Abstract

The fundamental hydrodynamic responses for four different oscillating wave surge converters (OWSCs) variants are analysed and compared. The four variants include; an isolated flap, a flap in front of a wall, a flap inside a caisson with an isolated water chamber behind the flap and a flap inside a caisson with a water chamber behind the flap that is linked to the water outside via to a gap under the flap. The flap rotations and power captures for the four variants are obtained using a frequency-domain model, with the flap response amplitude operator constrained to be less than 15°/m and the power capture maximised for damping-only control. It is shown that the four variants have qualitatively different frequency-dependencies in rotations and power captures, which are shown to be linked to differing values for the incident wave torque and system natural frequencies. A notable discovery was the existence of a potentially-exploitable water chamber pumping mode for a flap in a caisson with a gap under the flap, which had not previously been identified. The (dis)similarities between the flap variants are identified and discussed, providing a method by which the relative performance of the different variants can be understood.

Suggested Citation

  • Gunawardane, S.D.G.S.P. & Folley, M. & Kankanamge, C.J., 2019. "Analysis of the hydrodynamics of four different oscillating wave surge converter concepts," Renewable Energy, Elsevier, vol. 130(C), pages 843-852.
    • Handle: RePEc:eee:renene:v:130:y:2019:i:c:p:843-852
    DOI: 10.1016/j.renene.2018.06.115
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    References listed on IDEAS

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    1. Sudath Prasanna Gunawardane & Chathura Jayan Kankanamge & Tomiji Watabe, 2016. "Study on the Performance of the “Pendulor” Wave Energy Converter in an Array Configuration," Energies, MDPI, vol. 9(4), pages 1-26, April.
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    Cited by:

    1. Tongphong, Watchara & Kim, Byung-Ha & Kim, In-Cheol & Lee, Young-Ho, 2021. "A study on the design and performance of ModuleRaft wave energy converter," Renewable Energy, Elsevier, vol. 163(C), pages 649-673.
    2. Carballo, R. & Arean, N. & Álvarez, M. & López, I. & Castro, A. & López, M. & Iglesias, G., 2019. "Wave farm planning through high-resolution resource and performance characterization," Renewable Energy, Elsevier, vol. 135(C), pages 1097-1107.

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