3D FEM-BEM coupled resolution for acoustic waves propagation in potential flow
Résumé
In order to reduce the environmental impact of aircrafts, it is necessary to accurately simulate the acoustics waves propagation in complex environment. A classical method used to compute the noise propagation on large distances is the Boundary Element Method. However this method restricts the flow to a uniform one. To improve the level of modeling, we present here a coupling between Finite Element (FEM) and Boundary Element Methods (BEM) to solve the acoustic propagation problem that consists in a potential flow near the aircraft and a uniform flow far-away from the aircraft. The Lorentz transformation is introduced in the exterior domain to easily use the Boundary Element Method for the uniform flow. This transformation is also applied in the interior domain to obtain a natural coupling between the two domains. 3-D numerical results representative of industrial configurations, and in particular results with modal acoustic sources in the potential flow, will be shown.
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