Abstract
The goal of this paper is to investigate the acoustic field generated by the flow over a cavity using two different and complementary numerical methods. First, a Direct Numerical Simulation (DNS) of the 2-D compressible Navier-Stokes equations is performed to obtain directly the acoustic field. Second, this reference solution is compared to solutions provided by hybrid methods using the flowfield computed inside the cavity combined with an integral formulation to evaluate the far-field noise. Two integral methods are studied: the acoustic analogy of Ffowcs Williams and Hawkings (FW-H) and a wave extrapolation method based on FW-H equation. Both show a good agreement with DNS but the first one is more expensive owing to an additional volume integral. The extrapolation method from a surface is more efficient and provide a complementary tool to extend CAA near-field to very far field. These methods help the analysis of wave patterns, by separating the direct waves from the reflected ones.
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