Current-distorted wave diffraction patterns in the near-field of a monopile in coastal seas

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Original languageEnglish
Article number117432
JournalOcean engineering
Volume302
Issue number302
Early online date4 Apr 2024
Publication statusPublished - 15 Jun 2024

Abstract

The simultaneous impact of a wave field in the diffraction regime and a perpendicular intersecting current on a cylinder reflects a common application case for wave-current-structure interaction with offshore wind turbines in the German North Sea. Although existing literature has thoroughly investigated structural impacts from both waves and currents individually, the complex interplay between both forcings in the near-field of an offshore monopile has not been explored as thoroughly in the past. Only little is understood concerning the resulting nonlinear 3D interaction. This laboratory study evaluates the physical insights of a broad range of wavelength-dependent pile diameters, i.e., 0.14<diameterD/wavelengthL<0.25. The study focuses on surface elevation characteristics, documented either qualitatively using video recordings or quantitatively by surface elevation measurements in close vicinity of the pile. Within the experimental boundaries of this initial study, a current-induced, D/L-dependent asymmetry in crest amplitudes is documented. These distorted diffraction patterns are explained to originate from non-linear wave–current–structure interactions, which are not represented by existing design approaches. The findings further suggest that in this context, secondary load cycle dynamics are of practical relevance to the design and operation of offshore structures.

Keywords

    Water waves, Wave–structure interaction, Wave–current interaction, Diffraction, Secondary load cycle, Water surface elevation

ASJC Scopus subject areas

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Current-distorted wave diffraction patterns in the near-field of a monopile in coastal seas. / Wynants, Mareile; Schendel, Alexander; Welzel, Mario et al.
In: Ocean engineering, Vol. 302, No. 302, 117432, 15.06.2024.

Research output: Contribution to journalArticleResearchpeer review

Wynants M, Schendel A, Welzel M, Kerpen NB, Schlurmann T. Current-distorted wave diffraction patterns in the near-field of a monopile in coastal seas. Ocean engineering. 2024 Jun 15;302(302):117432. Epub 2024 Apr 4. doi: 10.1016/j.oceaneng.2024.117432
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AU - Welzel, Mario

AU - Kerpen, Nils B.

AU - Schlurmann, Torsten

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