Publications

Titre : Galbrun based numerical scheme to compute time-harmonic scattering in an arbitrary mean flow
Année : 2011
Type : conf_acti
Auteurs : A.-S. Bonnet-BenDhia, J.-F. Mercier, F. Millot, S. Pernet, E. Peynaud
Résumé : For the numerical simulation of time-harmonic acoustic scattering in a complex geom- etry, in presence of an arbitrary mean ow, the main diculty is the coexistence and the coupling of two very di erent phenomena: acoustic propagation and convection of vortices. We consider a linearized formulation coupling an augmented Galbrun equation (for the perturbation of displacement) with a time-harmonic convection equation (for the vortices). In addition, the computational region is truncated by means of Perfectly Matched Layers at arti cial boundaries. We implemented a hybrid numerical method which consists in coupling nite elements for the Galbrun equation and a Discontinuous Galerkin scheme for the convection equation. Finally, numerical tests show the eciency of the method.
Thèmes :
Référence : - American Institute of Aeronautics and Astronautics