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On the Effects of Geometry Control on the Performance of Overtopping Wave Energy Converters

Author

Listed:
  • Lander Victor

    (Department of Civil Engineering, Ghent University, Technologiepark 904, Zwijnaarde B-9052, Belgium)

  • Peter Troch

    (Department of Civil Engineering, Ghent University, Technologiepark 904, Zwijnaarde B-9052, Belgium)

  • Jens Peter Kofoed

    (Department of Civil Engineering, Aalborg University, Sohngaardsholmsvej 57, Aalborg DK-9000, Denmark)

Abstract

Overtopping wave energy converters (OWECs) are designed to extract energy from ocean waves based on wave overtopping into a reservoir, which is emptied into the ocean through a set of low-head turbines, and typically feature a low crest freeboard and a smooth impermeable steep slope. In the process of optimizing the performance of OWECs, the question arises whether adapting the slope geometry to the variable wave characteristics at the deployment site ( i.e. , geometry control) can increase the overall hydraulic efficiency and overall hydraulic power compared to a fixed slope geometry. The effect of five different geometry control scenarios on the overall hydraulic efficiency and overall hydraulic power of OWECs has been simulated for three possible deployment sites using empirical prediction formulae. The results show that the effect of an adaptive slope angle is relatively small. On the other hand, adapting the crest freeboard of the OWECs to the wave characteristics increases the overall hydraulic efficiency and power. Based on the simulations, gains in overall hydraulic power of at least 30% are achievable when applying an adaptive crest freeboard compared to a fixed crest freeboard.

Suggested Citation

  • Lander Victor & Peter Troch & Jens Peter Kofoed, 2011. "On the Effects of Geometry Control on the Performance of Overtopping Wave Energy Converters," Energies, MDPI, vol. 4(10), pages 1-27, October.
    • Handle: RePEc:gam:jeners:v:4:y:2011:i:10:p:1574-1600:d:14404
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    Citations

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    Cited by:

    1. Martins, J.C. & Goulart, M.M. & Gomes, M. das N. & Souza, J.A. & Rocha, L.A.O. & Isoldi, L.A. & dos Santos, E.D., 2018. "Geometric evaluation of the main operational principle of an overtopping wave energy converter by means of Constructal Design," Renewable Energy, Elsevier, vol. 118(C), pages 727-741.
    2. Liu, Zhen & Shi, Hongda & Cui, Ying & Kim, Kilwon, 2017. "Experimental study on overtopping performance of a circular ramp wave energy converter," Renewable Energy, Elsevier, vol. 104(C), pages 163-176.
    3. Shabara, Mohamed A. & Abdelkhalik, Ossama, 2023. "Dynamic modeling of the motions of variable-shape wave energy converters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 173(C).
    4. Alireza Shadmani & Mohammad Reza Nikoo & Riyadh I. Al-Raoush & Nasrin Alamdari & Amir H. Gandomi, 2022. "The Optimal Configuration of Wave Energy Conversions Respective to the Nearshore Wave Energy Potential," Energies, MDPI, vol. 15(20), pages 1-29, October.
    5. Bubbar, K. & Buckham, B., 2018. "On establishing an analytical power capture limit for self-reacting point absorber wave energy converters based on dynamic response," Applied Energy, Elsevier, vol. 228(C), pages 324-338.
    6. Wang, LiGuo & Ringwood, John V., 2021. "Control-informed ballast and geometric optimisation of a three-body hinge-barge wave energy converter using two-layer optimisation," Renewable Energy, Elsevier, vol. 171(C), pages 1159-1170.
    7. Antonio Mariani & Gaetano Crispino & Pasquale Contestabile & Furio Cascetta & Corrado Gisonni & Diego Vicinanza & Andrea Unich, 2021. "Optimization of Low Head Axial-Flow Turbines for an Overtopping BReakwater for Energy Conversion: A Case Study," Energies, MDPI, vol. 14(15), pages 1-20, July.
    8. Guo, Bingyong & Ringwood, John V., 2021. "Geometric optimisation of wave energy conversion devices: A survey," Applied Energy, Elsevier, vol. 297(C).

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