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Sound generation in a mixing layer. (English) Zbl 0901.76075
The sound generated by vortex pairing in a two-dimensional compressible mixing layer is investigated. Direct numerical simulations (DNS) of the Navier-Stokes equations are used to compute both the near-field region and a portion of the acoustic field. The acoustic analogy is also solved with acoustic sources determined from the near-field data of the DNS. It is shown that several commonly made simplifications to the acoustic sources can lead to erroneous predictions for the acoustic field.

MSC:
76Q05 Hydro- and aero-acoustics
76M20 Finite difference methods applied to problems in fluid mechanics
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