What is it about?
It is especially complicated to model flow-induced sound accurately in the near and far-field. Typical methods can accurately predict the acoustics in the far-field of flow structures. The wave model presented goes into the direction to model near-field. A first full computation was performed. We found that although the source magnitude of this equation is reduced by 90% in contrast to sources of Lighthill's theory sound radiation is predicted well. This result was achieved by shifting the convection effects of the flow to the wave operator.
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Why is it important?
Our finding show that frozenly convected source structures are not radiating sound for this example and therefore hide large proportions of the "true" sound sources of aeroacoustic wave equations.
Perspectives
In the future, we will advance this study and test this for a wide range of mixing layer and jet configurations at different Mach number.
Stefan Schoder
TU Graz
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This page is a summary of: Aeroacoustic wave equation based on Pierce's operator applied to the sound generated by a mixing layer, June 2022, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/6.2022-2896.
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