Linearization of the Wave Spectrum: A Comparison of Methods

Dylan Barratt, Harry B. Bingham, Paul H. Taylor , Ton S. van den Bremer , Thomas A. A. Adcock

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    The relative contributions of free waves and bound waves to the formation of an extreme wave event remains a topic of interest in offshore engineering. A variety of methods have been proposed for identifying and removing the bound wave components. The method of “phase separation” or “phase manipulation” repeats simulations/experiments of a wave field with an offset in the initial phase of the wave components and relies upon summation of the resulting wave fields to isolate the bound harmonics, following from a Stokes expansion in steepness; the method has proven effective in isolating bound harmonics but requires that all cases be repeated. Alternatively, the bound harmonics can be removed using a three-dimensional fast Fourier transform (3D-FFT) of the wave field. However, the Fourier transform requires periodicity in the signal and assumes homogeneity in space and stationarity in time, producing spurious modes otherwise. We compare the phase separation and 3D-FFT approaches for a steep, focusing wave group in deep water using the numerical simulation tool, OceanWave3D, and discuss the effectiveness of both methods.
    Original languageEnglish
    Title of host publicationProceedings of the ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering
    Number of pages7
    VolumeVolume 2A: Structures, Safety, and Reliability
    PublisherThe American Society of Mechanical Engineers (ASME)
    Publication date2020
    Article numberOMAE2020-18820
    ISBN (Electronic)978-0-7918-8432-4
    DOIs
    Publication statusPublished - 2020
    Event39th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2020) - Virtual Conference
    Duration: 3 Aug 20207 Aug 2020

    Conference

    Conference39th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2020)
    LocationVirtual Conference
    Period03/08/202007/08/2020

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