Offshore monopile in the southern North Sea: Part I, calibrated input sea state

Alistair Borthwick, Ariel Edesess, Denis Kelliher, Gareth Thomas

Research output: Contribution to journalArticlepeer-review

Abstract

Safe, reliable access is an essential precondition for the successful maintenance of offshore wind farms. Access from vessels to wind turbines depends upon the severity of the sea state in the vicinity of the turbine support structure. This paper presents a validation of a numerical boundary condition developed to reproduce the seasonal sea state at Teesside Offshore Wind Farm, off the coast of the United Kingdom. The boundary condition, called customSpectrum, is derived from wave energy spectra obtained by analysis of existing field measurements of wave free surface displacement at the wind farm site and implemented in OpenFOAM, the open-source computational fluid dynamics (CFD) library. OpenFOAM is then used to simulate typical spring, summer, autumn and winter sea states as unidirectional waves. Predicted surface elevations and significant wave heights are found to be in agreement with in situ buoy data, thus validating the OpenFOAM model. Satisfactory agreement is achieved between analytical and numerically predicted spectral density functions for the horizontal and vertical water particle velocity components. It is found that the wave activity at Teesside is uni-modal in spring and autumn, and bi-modal in summer and winter. It is recommended to extend the procedure to multi-directional waves in crossing seas
Original languageEnglish
JournalProceedings of the ICE - Maritime Engineering
Early online date24 Jan 2018
DOIs
Publication statusE-pub ahead of print - 24 Jan 2018

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