Breaking phase focused wave group loads on offshore wind turbine monopiles

The Science of Making Torque from Wind

Ghadirian, A.^1 ; Bredmose, H.^1 ; Dixen, M.^2

DTU Wind Energy, Nils Koppels Alle Building 403, Kgs. Lyngby

DK-2800, Denmark^1

DHI, Agern Alle 5, Hørsholm

DK-2970, Denmark^2

关键词: Developed model;    Engineering models;    Extreme waves;    Free surface elevations;    Maximum forces;    Measurements of;    Offshore winds;    Pressure field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/9/092004/pdf
DOI  :  10.1088/1742-6596/753/9/092004

来源: IOP

【 摘 要 】

The current method for calculating extreme wave loads on offshore wind turbine structures is based on engineering models for non-breaking regular waves. The present article has the aim of validating previously developed models at DTU, namely the OceanWave3D potential flow wave model and a coupled OceanWave3D-OpenFOAM solver, against measurements of focused wave group impacts on a monopile. The focused 2D and 3D wave groups are reproduced and the free surface elevation and the in-line forces are compared to the experimental results. In addition, the pressure distribution on the monopile is examined at the time of maximum force and discussed in terms of shape and magnitude. Relative pressure time series are also compared between the simulations and experiments and detailed pressure fields for a 2D and 3D impact are discussed in terms of impact type. In general a good match for free surface elevation, in-line force and wave-induced pressures is found.