Comptes Rendus
Some useful hybrid approaches for predicting aerodynamic noise
Comptes Rendus. Mécanique, Volume 333 (2005) no. 9, pp. 666-675.

In recent years, several numerical studies have shown the feasibility of Direct Noise Computation (DNC) where the turbulent flow and the radiated acoustic field are obtained simultaneously by solving the compressible Navier–Stokes equations. The acoustic radiation obtained by DNC can be used as reference solution to investigate hybrid methods in which the sound field is usually calculated as a by-product of the flow field obtained by a more conventional Navier–Stokes solver. A hybrid approach is indeed of practical interest when only the non-acoustic part of the aerodynamic field is available. In this review, some acoustic analogies or hybrid approaches are revisited in the light of CAA.

Plusieurs travaux récents ont montré la faisabilité d'un calcul direct du bruit d'origine aérodynamique par résolution des équations de Navier–Stokes compressibles. Le champ acoustique obtenu par ce calcul direct peut servir de solution de référence pour étudier les méthodes hybrides, où le champ acoustique rayonné est calculé à partir d'une solution des équations de Navier–Stokes obtenue avec un solver conventionnel. Les méthodes hybrides sont en effet destinées à prévoir le champ sonore lorsqu'il est difficile d'effectuer un calcul aérodynamique compressible. Dans cet article, quelques analogies acoustiques sont revisitées en s'appuyant sur des résultats de l'aéroacoustique numérique.

Published online:
DOI: 10.1016/j.crme.2005.07.006
Keywords: Acoustics, Computational acoustics, Lighthill's analogy, Ffowcs Williams and Hawkings analogy, Propagation in flows, Diffraction
Mot clés : Acoustique, Aéroacoustique numérique, Analogie de Lighthill, Analogie de Ffowcs Williams et Hawkings, Propagation en écoulement, Diffraction

Christophe Bailly 1; Christophe Bogey 1; Xavier Gloerfelt 2

1 Laboratoire de mécanique des fluides et d'acoustique UMR CNRS 5509 & École centrale de Lyon, 36, avenue Guy de Collongue, 69134 Ecully cedex, France
2 Laboratoire de simulation numérique en mécanique des fluides (SINUMEF), ENSAM, 151, boulevard de l'hôpital, 75013 Paris, France
     author = {Christophe Bailly and Christophe Bogey and Xavier Gloerfelt},
     title = {Some useful hybrid approaches for predicting aerodynamic noise},
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Christophe Bailly; Christophe Bogey; Xavier Gloerfelt. Some useful hybrid approaches for predicting aerodynamic noise. Comptes Rendus. Mécanique, Volume 333 (2005) no. 9, pp. 666-675. doi : 10.1016/j.crme.2005.07.006.

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