Experimental and numerical statistics of storm wave forces on a monopile in uni- and multidirectional seas

Signe Schløer, Henrik Bredmose, Amin Ghadirian

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

    Abstract

    Experiments with both uni- and multidirectional wave realizations with a stiff pile subjected to extreme wave forces are considered. Differences in crest heights and force peaks resulting from directional spread waves are analysed. The wave realizations are reproduced numerically in the fully nonlinear wave model OceanWave3D. The numerical reproductions compare well to the experiments. Only for the largest forces significant differences are seen, which is due to a very simple breaking filter applied in OceanWave3D. In the wave spectra, the higher harmonics occur for smaller frequencies than the straight multiples of the peak frequency. Further, the higher harmonics of the multidirectional wave spectra contain less energy. Both effects can be explained by the second order wave theory. Finally, the computed wave kinematics are used to investigate the dynamic response of an offshore wind turbine. The excitation of the first natural frequency is largest for the unidirectional wave realizations, as the higher harmonics are largest for these realizations.
    Original languageEnglish
    Title of host publicationASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
    Number of pages11
    Volume10
    PublisherThe American Society of Mechanical Engineers (ASME)
    Publication date2017
    Article numberOMAE2017-61676
    ISBN (Electronic)978-0-7918-5778-6
    DOIs
    Publication statusPublished - 2017
    Event36th International Conference on Ocean, Offshore and Artic Engineering - Trondheim, Norway
    Duration: 25 Jun 201730 Jun 2017
    Conference number: 36

    Conference

    Conference36th International Conference on Ocean, Offshore and Artic Engineering
    Number36
    Country/TerritoryNorway
    CityTrondheim
    Period25/06/201730/06/2017

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