One of the most important issues in aeroacoustics design and development is the optimization of noise and vibration in both interior and exterior design processes. Especially the subjective comfort depends strongly on the interior noise. Besides the experimental investigations of the aeroacoustic phenomenon, numerical simulations have become more and more an effective tool to shorten the development cycle. This paper proposes a new approach based on a finite volume method for determining the resonance frequencies for enclosures. The current formulation requires as input the non-uniform mean flow obtained from a steady state solution together with prescribed boundary conditions. The method involves coupling the Linearized Navier-Stokes Equations with the Arnoldi algorithm. The Acoustic Modal Analysis, based on the iterative Implicitly Restarted Arnoldi method, offers a fast and efficient solver for large industrial eigenvalue problems. Using the data from this model, the natural acoustic modes of the system and the corresponding frequencies can be identified. These modes can resonate with interior acoustic source processes. The potential of the new method will be presented by means of several academic and industrial test cases ranging from thermo-acoustics to typical automotive and aerospace applications.
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