A fully nonlinear 3D Navier Stokes solver with VOF (Volume of Fluid) treatment of the free surface is used to reproduce two extreme laboratory wave impacts on a gravity wind turbine foundation. The wave climate is irregular waves with a current. Numerical results for inline force, overturning moment and run-up are compared to measurements. The extreme wave loads for the two events are associated with slamming onto the under side of a horizontal platform placed 9.1m above the still water level. For such impacts, the computed wave loads are strongly sensitive to the shape of the incoming waves. A comparison with a Morison-type estimation of the wave loads shows that this much simpler approach can reproduce the overall trend of the wave load history, but not the extreme moment.
- Ocean, Offshore, and Arctic Engineering Division
Numerical Reproduction of Extreme Wave Loads on a Gravity Wind Turbine Foundation
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Bredmose, H, Skourup, J, Hansen, EA, Christensen, ED, Pedersen, LM, & Mitzlaff, A. "Numerical Reproduction of Extreme Wave Loads on a Gravity Wind Turbine Foundation." Proceedings of the 25th International Conference on Offshore Mechanics and Arctic Engineering. Volume 1: Offshore Technology; Offshore Wind Energy; Ocean Research Technology; LNG Specialty Symposium. Hamburg, Germany. June 4–9, 2006. pp. 279-287. ASME. https://doi.org/10.1115/OMAE2006-92258
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