Computation of the noise of initially laminar jets using a statistical approach for the acoustic analogy: application and discussion
Résumé
The details of the sound sources within two initially laminar jets that correspond to different inflow conditions, one fully laminar and the other with nozzle boundary layer forcing, are studied using an acoustic analogy. The source statistics are generated from Large Eddy Simulations and some issues associated with the practicalities of doing this and the frequency and lengthscale ranges of validity that one can expect from such simulations are explored. The comparative importance of various source terms confirms the results of previous studies with the exception of one extra term. Reasonable agreement is found between noise predictions using the acoustic analogy with that of a previously-conducted LES-ILEE control surface method, over the frequency range of validity. The acoustic analogy is used to determine the lengthscales which contribute to noise at different radiated angles to the jet and where they are located in the jets.
Domaines
Sciences de l'ingénieur [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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