Accurate predictions of the Ultimate Limit State Wave Loads on Bottom Fixed Wind Turbine

Abstract

In this project the breaking wave loads on a bottom fixed monopile has been determined with the use of the Pressure Impulse Model. The pressure impulse model is the integral of pressure dependent by time during a short period of time scale. The model was derived for an idealized wave on a vertical cylinder with the variables being crest length, impact height and the free maximum angle of impact which is tuned to give the correct impulse force. Further, the breaking wave loads on a vertical cylinder is determined by using guidelines provided in Det Norske Veritas (DNVGL) and International Electrotechnical Commission (IEC) standards, conditioned on the same sea state applied for the pressure impulse model. The results obtained from the guidelines in DNVGL and IEC standards is compared to the results from the pressure impulse model, and the results obtained shows that the force impulse determined based on these models are overpredicted compared to the pressure impulse model.