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    Nonlinear Hydrodynamic Force Relevance for Heaving Point Absorbers and Oscillating Surge Converters


    Giorgi, Giuseppe and Penalba, Markel and Ringwood, John (2016) Nonlinear Hydrodynamic Force Relevance for Heaving Point Absorbers and Oscillating Surge Converters. In: Asian Wave and Tidal Energy Conference (AWTEC 2016), 24-28 October 2016, Singapore.

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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 surge converters (OSCs). Notwithstanding essential hydrodynamic differences, both devices are very often described by the same linear model structure. However, if the linearising assumption of small amplitudes of motion is challenged, especially under controlled conditions, different (and significant) nonlinearities are excited in the devices. This paper studies the differences between the hydrodynamic forces in HPAs and OSCs under controlled conditions, considering a nonlinear representation of Froude-Krylov forces and viscous drag effects. Results show that HPAs are predominantly affected by nonlinear Froude-Krylov forces, while the most important hydrodynamic forces in OSCs are due to diffraction and radiation effects. In addition, viscous drag appears to have little relevance in HPAs but a significant influence in OSCs.

    Item Type: Conference or Workshop Item (Paper)
    Additional Information: This paper is based upon work supported by Science Foundation Ireland under Grant No. 13/IA/1886.
    Keywords: Wave energy; nonlinear Froude-Krylov force; viscous drag; heaving point absorbers; oscillating surge converters;
    Academic Unit: Faculty of Science and Engineering > Electronic Engineering
    Item ID: 9428
    Depositing User: Professor John Ringwood
    Date Deposited: 30 Apr 2018 13:44
    Refereed: Yes
    Funders: Science Foundation Ireland (SFI)
    URI:

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