Noise Scattering by Regularized Boundary Elements and Ffowcs–Williams and Hawkings Method

In this paper, the authors present a method for computing noise scattering against solid bodies. The method is based on coupling the Ffowcs–Williams and Hawkings (FW-H) method with a regularized boundary element method (BEM). The benefit of the chosen approach is that the computation of the noise sources, which is typically done with high-fidelity computational fluid dynamics/computational aeroacoustics, is decoupled from the noise-scattering problem. This makes it possible to consider several different configurations of a scattering body using a single simulation of the noise sources. In the paper, the authors provide a detailed description of the two methods (FW-H and BEM) as well as how they are coupled. They also demonstrate the accuracy of the chosen approach by applying it to a set of test cases with analytical solutions. Finally, they use the coupled FW-H/BEM approach to compute the acoustic loads on the rear parts of two business jet fuselages and compare the numerical results to experimental data obtained by The German Aerospace Center (DLR), German Aerospace Center in the Aeroacoustic Wind Tunnel of Braunschweig.