1. The French Aerospace Lab ONERA , , Aerodynamics, Aeroelasticity, Acoustics Department (DAAA), Helicopter, Propeller and Turbomachinery Unit, 8 rue des Vertugadins, 92190 Meudon , France
2. The French Aerospace Lab ONERA , , Aerodynamics, Aeroelasticity, Acoustics Department (DAAA), Numerical Aeroacoustic Team, 29 Avenue de la Division Leclerc, 92320 Châtillon , France