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    Comparing nonlinear hydrodynamic forces in heaving point absorbers and oscillating wave surge converters


    Giorgi, Giuseppe and Ringwood, John (2018) Comparing nonlinear hydrodynamic forces in heaving point absorbers and oscillating wave surge converters. Journal of Ocean Engineering and Marine Energy, 4 (1). pp. 25-35. ISSN 2198-6444

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    Abstract

    Two of the most common modes of oscillation of single degree of freedom wave energy converters are heave and surge, which are, respectively, exploited by heaving point absorbers (HPAs), and oscillating wave surge converters (OWSCs). Given major hydrodynamic differences between HPAs and OWSC, different nonlinear forces may be more or less relevant. Likewise, the scaling properties of such nonlinear forces may be different, according to the type of device, introducing uncertainties. This paper studies different nonlinear effects, and the relevance of different hydrodynamic force components, in HPAs and OWSCs. Nonlinear Froude–Krylov forces, as well as viscous drag effects, are represented and both prototype and full-scale device sizing are considered. Results show that HPAs are predominantly affected by nonlinear Froude–Krylov forces, while the most important hydrodynamic forces in OWSCs are diffraction and radiation effects. In addition, viscous drag appears to have little relevance in HPAs, but a significant influence in OWSCs. Finally, nonlinearities are shown to significantly affect the phase of the different force components.

    Item Type: Article
    Additional Information: Cite as: Giorgi, G. & Ringwood, J.V. J. Ocean Eng. Mar. Energy (2018) 4: 25. https://doi.org/10.1007/s40722-017-0098-2
    Keywords: Heaving point absorber; Oscillating wave surge converter; Nonlinear Froude–Krylov force; Viscous drag;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Faculty of Science and Engineering > Research Institutes > Centre for Ocean Energy Research
    Item ID: 12445
    Identification Number: https://doi.org/10.1007/s40722-017-0098-2
    Depositing User: Professor John Ringwood
    Date Deposited: 11 Feb 2020 15:54
    Journal or Publication Title: Journal of Ocean Engineering and Marine Energy
    Publisher: Springer
    Refereed: Yes
    Funders: Science Foundation Ireland (SFI)
    URI:

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