1. Institute of Aerodynamics and Gas Dynamics (IAG); Universität Stuttgart; Pfaffenwaldring 21; D-70550; Stuttgart; Germany
2. Department of Mechanical Engineering; Technical University of Denmark (DTU); Nils Koppels Alle, Building 403; DK-2800; Lyngby; Denmark
3. Wind EnergyDivision; Risø-DTU; Building 118; DK-4000; Roskilde; Denmark