Numerical Simulation For Wave Loads On The Foundations Of Offshore Wind Turbine In A Porous Seabed

At present,on the premise of reducing carbon emissions and increasing demand for power generation,the offshore wind power,as a renewable marine energy source,has been planned and constructed in offshore waters in many countries,including China.China is mainly in the area with a water depth of 50 meters as the key development area.When the offshore wind turbine foundation is designed and constructed,the complex hydrodynamic environment,especially wave load,is one of the most important loads on the structure.Waves can affect the structural stability in two different ways: one is directly acting on the structure;the other is affecting the structural stability through the dynamic response of the seabed.In this study,a three-dimensional numerical wave flume is established to simulate the wave forces acting on different types of offshore wind turbine foundations.Furthermore,considering the influence of porous media on the seabed,the influence of seepage on the wave forces acting on the foundations has been analyzed.The conclusions are following as:(1)Based on OpenFOAM open source program,a three-dimensional numerical wave flume is established.On the base of model validation,the wave forces acting on single pile,gravity and jacket offshore wind turbine foundations are simulated.The empirical solutions calculated by Morison equation are compared,and the wave loads of different structural types of offshore wind power foundations are analyzed.(2)Considering the influence of porous media on the seabed,a three-dimensional numerical model of wave-seabed-wind turbine foundation interactions is established to analyze the influence of seabed permeability on the wave force on the wind power foundation.