Abstract
Added mass coefficient (Ca) and drag force coefficient (Cd) plays an essential role in dynamic response of floating offshore wind turbine (FOWT). A method is proposed to combine KC number dependency and wake effect in Morison’s equation. Firstly, wake effect on Ca and Cd of cylinders, which is caused by multimember arrangement in semisubmersible floater of offshore floating wind turbine (FOWT) is investigated by compactional fluid dynamics (CFD) simulation. Secondary, accuracy of added mass matrix of Morison’s equation is presented by comparison with global matrix of potential theory. Relationship between KC number and hydrodynamic coefficients of single cylinder is used for cylinders of semisubmersible floater. Then, global Ca and Cd in wide range of KC number is predicted based on CFD result after correction by wake effect. At last, effect of wake and KC number dependency of Ca and Cd on dynamic response of FOWT is discussed. Result indicates wake and KC number dependency is important for dynamic response.
