Modeling Aeolian Tones by Global Instability Modes
Résumé
A noise prediction approach is proposed for bluff body wakes such as flow over a cylinder, where the primary noise source comprises of large scale coherent structures such as the vortex shedding flow feature. With the aim of developing low-order noise models, the strategy of this work is to extract and model such coherent structures. The modeling is based on a linear global stability analysis on the time-averaged mean flow to extract the dominant structures, whose amplitudes are then calibrated via two-point statistics. Curle's analogy is then implemented for far-field noise predictions. The overall approach is validated for flow over a circular cylinder for two cases of Reynolds numbers, Re=150 and 13000, and the noise predictions are found to be <2dB off from the actual measurements.
Domaines
Sciences de l'ingénieur [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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Licence |
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