Dear Harald,
IECWind is simple code for making IEC-style discrete wind data files in AeroDyn’s “hub-height” format (e.g., ECD, EOG, etc.). The TurbSim code has been developed for computing turbulent wind data for AeroDyn based on turbulence spectra, spatial coherence, and component-to-component correlation. You can find the TurbSim code here: wind.nrel.gov/designcodes/preprocessors/turbsim/.
Best regards,