中文摘要：

采用计算流体动力学（CFD）方法,基于RANS方程和SST k-ω湍流模型,对OC3-Hywind Spar浮式平台支撑的NREL5 MW风机进行气动性能模拟。对固定式风机的数值模型做网格无关性验证,同时考虑垂直风切变的影响,并将数值结果与NREL设计数据进行对比以验证模型的有效性。在FLUENT软件中,设定嵌入式滑移网格和用户定义程序（UDF）来模拟风机叶轮随平台的周期运动,分别研究浮式平台的纵荡、纵摇和首摇运动对风机气动荷载的影响。数值结果表明平台的纵荡和纵摇运动对输出功率影响较大,且平台运动幅值越大周期越低,其气动荷载变化越剧烈。合理控制平台的运动幅值对提高浮式风机的发电性能和疲劳强度有很大作用。

英文摘要：

Computational fluid dynamic（ CFD） method is used to simulate the aerodynamic performance of floating offshore wind turbine（ FOWT） experiencing platform motions. Based on the RANS equations and the k-ω shear-stress transport（ SST） turbulence model,aerodynamic simulations for NREL 5MW turbine combined with OC3-Hywind spar buoy are studied. Grid independence studies are performed in fixed type offshore wind turbine,considering the effect of vertical wind shear,and the simulation results are compared with NREL published data to verify the numerical model. Furthermore,embedded moving mesh technique and user-defined functions（ UDF） are adopted in FLUENT software to model the periodical motions of the rotor,and the effects of typical surge,pitch and yaw motions of the platform on turbine aerodynamic loads are investigated. The simulation results reveal that the surge and pitch motions have a greater impact on the fluctuation of the output power,and more significant variation of the aerodynamic loads would be introduced by larger amplitude and shorter period of the motion. The aerodynamic performance of the turbine and the fatigue strength of the structures would be significantly improved by reasonable controlling of the platform motions.