Numerical Study Of Wave-current Loads Acting On Foundation Of Fixed Offshore Wind Turbine

Wind energy is one of the most promising renewable clean energy,and it plays a more and more important role in the filed of new energy.The use of offshore wind turbine is one of the efficient way to exploit wind energy.And to make the wind turbine work properly,it is necessary to set up a corresponding foundation for the offshore wind turbine which can keep the wind turbine at its position.With the development of computational fluid dynamics(CFD)and numerical method,CFD is playing an increasingly important role in prediction of dynamic performance of fixed offshore windturbine foundation.Due to viscosity effects have been taken into consideration,CFD method can provide more detailed and accurate prediction about the pressure and forth for the foundation.The foundation of offshore wind turbine has varies kinds of types.The monoplie foundation is the most widely used form of fixed foundation.The elevated pile foundation can work in deeper water than the monoplie foundation,and the jacket foundation becomes more and more popular.This research is to understand more about the influence of the water depth,wave height and wave direction on the environmental loads of different foundations.In this paper,a series of numerical simulation is conducted by the help of a viscous flow solver named naoe-FOAM-SJTU,which is based on the open source toolbox OpenFOAM,for the foundation of a 3MW wind turbine.The combined wave-current loads on varies types of foundations in time domain i calculated.The different dynamic characteristics of those 4 foundations are discussed,and the influence of different flow direction,water depth and wave height on the loads foundation is studied.More over,the wave elevation for each foundation in different working condition is calculated.And the result in this research is chosen to be compared with the relative experimental result which is conducted in the State key laboratory of Shanghai Jiaotong University in order to validate the simulation.The result calculated by desigh specifations is also discussed.Conclusions from this research may provide practical information for the designers of fixed wind-turbine foundations.