Breaking wave forces on an Offshore Wind turbine foundation (Jacket type) in the Shallow water

摘要

In this study, the breaking wave forces on a jacket (steel space frame)structure are simulated using a 3D numerical model. The model isbased on solving the viscous and incompressible Navier-Stokesequations for a two-phase flow (air and water) model and the volume offluid method (VOF) for treating the free surface of the water. A cut-cellmethod is used to install the complicated geometry (e.g., jacketstructure) in the computational domain. The numerical model isvalidated by using experimental data obtained at the Large WaveChannel (GWK), Hannover, Germany. Free surface elevation, waterparticle velocities and total forces on the structure were calculated withthe numerical model, for both breaking and non-breaking cases and arecompared with the experimental data. The simulation results show goodagreement with the experimental data. Based on the validatednumerical results, slamming coefficients on the front and back verticalmembers are estimated. In addition to this, the reasons why maximumvalues of breaking wave forces measured in the total time series show alarge degree of scatter are briefly discussed.