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Wave Power Absorption by Arrays of Wave Energy Converters in Front of a Vertical Breakwater: A Theoretical Study

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  • Dimitrios N. Konispoliatis

    (Laboratory for Floating Structures and Mooring Systems, Division of Marine Structures, School of Naval Architecture and Marine Engineering, National Technical University of Athens, 9 Heroon Polytechniou Avenue, GR 157-73 Athens, Greece)

  • Spyridon A. Mavrakos

    (Laboratory for Floating Structures and Mooring Systems, Division of Marine Structures, School of Naval Architecture and Marine Engineering, National Technical University of Athens, 9 Heroon Polytechniou Avenue, GR 157-73 Athens, Greece)

Abstract

The present paper deals with the theoretical evaluation of the efficiency of an array of cylindrical Wave Energy Converters (WECs) having a vertical symmetry axis and placed in front of a reflecting vertical breakwater. Linear potential theory is assumed, and the associated diffraction and motion radiation problems are solved in the frequency domain. Axisymmetric eigenfunction expansions of the velocity potential are introduced into properly defined ring-shaped fluid regions surrounding each body of the array. The potential solutions are matched at the boundaries of adjacent fluid regions by enforcing continuity of the hydrodynamic pressures and redial velocities. A theoretical model for the evaluation of the WECs’ performance is developed. The model properly accounts for the effect of the breakwater on each body’s hydrodynamic characteristics and the coupling between the bodies’ motions and the power take-off mechanism. Numerical results are presented and discussed in terms of the expected power absorption. The results show how the efficiency of the array is affected by (a) the distance between the devices and the wall, (b) the shape of the WEC array configuration, as well as (c) the angle of the incoming incident wave.

Suggested Citation

  • Dimitrios N. Konispoliatis & Spyridon A. Mavrakos, 2020. "Wave Power Absorption by Arrays of Wave Energy Converters in Front of a Vertical Breakwater: A Theoretical Study," Energies, MDPI, vol. 13(8), pages 1-25, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:8:p:1985-:d:346681
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    References listed on IDEAS

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    1. Loukogeorgaki, Eva & Michailides, Constantine & Lavidas, George & Chatjigeorgiou, Ioannis K., 2021. "Layout optimization of heaving Wave Energy Converters linear arrays in front of a vertical wall," Renewable Energy, Elsevier, vol. 179(C), pages 189-203.

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