Aerodynamic wake characteristics analysis of floating offshore wind turbine under platform pitching and yawing motions

The pitch and yaw motion of the platform affects the aerodynamic wake characteristics of the floating offshore wind turbine. Using Fluent software, numerical simulations were conducted on floating offshore wind turbines under pitch and yaw motion conditions of different frequencies and amplitudes, and their wake characteristics were thoroughly analyzed. The increase in amplitude and frequency of platform motion aggravates the fluctuation of power and axial thrust of the wind turbine. In addition, the tail vortex distribution of the wind turbine changes with time under both pitch and yaw motion conditions. Compared with the pitch motion, the hub vortex of the yaw motion is more concentrated and the wake vortex is relatively stable. The influence of the wake structure and blade tip velocity vortex distribution in pitch motion is greater than that in yaw motion. As the amplitude and frequency of platform motion increase, the recovery speed of wake under pitch and yaw motion increases. However, compared to yaw motion, the wake recovery speed under pitch motion is slower.