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Comparison and Validation of Hydrodynamic Theories for Wave Energy Converter Modelling

Author

Listed:
  • Matthew Leary

    (College of Engineering, Oregon State University, Corvallis, OR 97331, USA)

  • Curtis Rusch

    (Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA)

  • Zhe Zhang

    (C-Power, Corvallis, OR 97333, USA)

  • Bryson Robertson

    (College of Engineering, Oregon State University, Corvallis, OR 97331, USA
    Pacific Northwest National Laboratory, Richland, WA 99354, USA)

Abstract

Dynamic Wave Energy Converter (WEC) models utilize a wide variety of fundamental hydrodynamic theories. When incorporating novel hydrodynamic theories into numerical models, there are distinct impacts on WEC rigid body motions, cable dynamics, and final power production. This paper focuses on developing an understanding of the influence several refined hydrodynamic theories have on WEC dynamics, including weakly nonlinear Froude-Krylov and hydrostatic forces, body-to-body interactions, and dynamic cable modelling. All theories have evolved from simpler approaches and are of importance to a wide array of WEC archetypes. This study quantifies the impact these theories have on modelling accuracy through a WEC case study. Theoretical differences are first explored in a regular sea state. Subsequently, numerical validation efforts are performed against field data following wave reconstruction techniques. Comparisons of significance are WEC motion and cable tension. It is shown that weakly nonlinear Froude-Krylov and hydrostatic force calculations and dynamic cable modelling both significantly improve simulated WEC dynamics. However, body-to-body interactions are not found to impact simulated WEC dynamics.

Suggested Citation

  • Matthew Leary & Curtis Rusch & Zhe Zhang & Bryson Robertson, 2021. "Comparison and Validation of Hydrodynamic Theories for Wave Energy Converter Modelling," Energies, MDPI, vol. 14(13), pages 1-18, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:13:p:3959-:d:586986
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    References listed on IDEAS

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    1. Penalba, Markel & Giorgi, Giussepe & Ringwood, John V., 2017. "Mathematical modelling of wave energy converters: A review of nonlinear approaches," Renewable and Sustainable Energy Reviews, Elsevier, vol. 78(C), pages 1188-1207.
    2. Robertson, Bryson & Bailey, Helen & Leary, Matthew & Buckham, Bradley, 2021. "A methodology for architecture agnostic and time flexible representations of wave energy converter performance," Applied Energy, Elsevier, vol. 287(C).
    3. Windt, Christian & Davidson, Josh & Ringwood, John V., 2018. "High-fidelity numerical modelling of ocean wave energy systems: A review of computational fluid dynamics-based numerical wave tanks," Renewable and Sustainable Energy Reviews, Elsevier, vol. 93(C), pages 610-630.
    4. Josh Davidson & John V. Ringwood, 2017. "Mathematical Modelling of Mooring Systems for Wave Energy Converters—A Review," Energies, MDPI, vol. 10(5), pages 1-46, May.
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