Computation of Trailing Edge Noise of a 3D Lifting Airfoil in Turbulent Subsonic Flow

Abstract

A hybrid method is applied to predict trailing edge noise based on a Large Eddy Simulation (LES) of the compressible flow problem in the immediate acoustic source region and acoustic perturbation equations (APE) for the simulation of the acoustic radiation problem in space and time. The mean flow convection and refraction effects are part of the simulation of wave propagation such that the computational domain of the flow simulation in general has to comprise only the significant acoustic source region. Using linearized acoustic perturbation equations the unbounded growth of hydrodynamic instabilities in critical mean flows is prevented completely. The acoustic problem is solved in two dimensions. A correction method is proposed that adapts the sound pressure levels to that of a wing with finite wing span.