GPU CABARET Solutions for 30P30N Three-element High-lift Airfoil with Slat Modifications.

Slat noise is well known as one of the dominant noise components of airframe noise. The slat cove has been demonstrated to be one of the primary sound sources responsible for narrowband and broadband noise from high-lift devices. In order to reduce slat noise, several slat modifications mostly aerodynamic have been carried out in the past. In the present study, Wall-Modeled Large Eddy Simulations using GPU CABARET flow solver have been used to assess the aerodynamic and aeroacoustic performance of a 30P30N high-lift airfoil with effective slat modifications such as slat cove filler. The numerical simulations were carried out at an angle of attack of α = 5:5 at an inlet velocity of U1 = 58 m/s, corresponding to a chord-based Reynolds number of Rec = 1.71x10^6 The surface pressure distribution and far-field noise spectra have been validated with data available in the literature. Contours of detailed flow field components such as mean velocity and turbulent kinetic energyfor different slat modifications are presented in a systematic manner. Unsteady wall surface pressure spectra at various locations on the slat and main-element show that the application of slat cove filler eliminates the narrowband noise source and reduces the broadband noise for the tested cases. The suppression of the slat tones in the SCF configuration were visualised using pressure fluctuation distributions and the spectral analysis based on the Spectral Proper Orthogonal Decomposition method.