Slat Noise Prediction using Discontinuous Galerkin Method and Stochastic Turbulent Sound Source

Abstract

A promising way to predict airframe noise is the numerical solution of the Acoustic Perturbation Equations (APE) with the help of the Discontinuous Galerkin Method (DGM) and the Fast Random Particle Mesh (FRPM) method. The latter stochastically computes the turbulent source term of the APE, while the DGM reliably provides their spatial discretization, even on a flexible unstructured grid. The goal of the current work is to compute broadband slat noise of two different high-lift airfoil configurations in two dimensions with this approach. The dependency of the result on the resolution of both the FRPM- as well as the DG-grid is analysed, and the parameter sensitivity of the FRPM method is investigated. Furthermore, computed sound pressure spectra are compared to measured spectra, and computational times are examined.