Abbreviations AOA angle of attack BL boundary layer CFD computational fluid dynamics DLR German Aerospace Center DNW Deutsch‐Niederländische Windkanäle—German‐Dutch Wind Tunnels HDG high pressure wind tunnel KKK Kölner Kryokanal (Cryogenic Windtunnel at Cologne) L2D lift‐to‐drag ratio cL/cD TAT thin airfoil theory TI turbulence intensity RANS Reynolds averaged Navier–Stokes equations RN Reynolds number URANS Unsteady Reynolds averaged Navier–Stokes equations 1 INTRODUCTION Wind energy was...