Dear @NaiZhi.Guo,
Due to limitations of TurbSim and the InflowWind module of OpenFAST, it is not really possible to use TurbSim to generate turbulent wind data with time-varying mean wind speed and direction. This topic has been discussed in other forum posts, e.g.,: Stitch Together TurbSim Timeseries.
In addition to TurbSim, FAST.Farm also supports the use of turbulent inflow generated by a high-fidelity precursor simulation, such as via the ABLSolver of SOWFA or AMR-Wind. With such an approach, it is possible to generate turbulent inflow with time-varying mean wind speed and direction for use within FAST.Farm.
Best regards,