Semi‐Empirical Modelling of Broadband Noise for Aerofoils

Turbulence related noise is widely recognized to be one of the most important aerodynamic noise sources for many applications and the development of computational tools for its modelling and prediction is an even more important target in many areas of applied engineering. On a general basis the noise generation mechanisms that can occur on an aerofoil surface can be classified in three main categories: Turbulent Boundary Layer‐Trailing Edge noise (TBL‐TE), the Laminar Boundary Layer—Vortex Shedding (LBL‐VS) noise and the Separation Stall (S‐S) noise, respectively related to the boundary layer turbulent eddies, to the boundary layer laminar instabilities and to the large vorticity that can be experienced for different Angle of Attacks, Reynolds and Mach numbers. Despite of the recent improvements of Computational Fluid Dynamics in the frame of turbulence modelling, the numerical computation of high Reynolds flow field turbulence for acoustic purposes is still a hard task to perform as it requires a time‐de...