The aero-acoustics of duct singularities are characterized by a novel LES/SI approach. An acoustically excited Large Eddy Simulation (LES) is performed. Subsequently, LES time series are analysed by means of parametric System Identification (SI) to concurrently characterize acoustic scattering as well as noise sources. Acoustic low-order network models that reproduce, e.g., noise sources in the presence of acoustic feedback may be built from the results. The method is validated against experiment, confidence intervalls and limits of applications are analysed.
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The aero-acoustics of duct singularities are characterized by a novel LES/SI approach. An acoustically excited Large Eddy Simulation (LES) is performed. Subsequently, LES time series are analysed by means of parametric System Identification (SI) to concurrently characterize acoustic scattering as well as noise sources. Acoustic low-order network models that reproduce, e.g., noise sources in the presence of acoustic feedback may be built from the results. The method is validated against experime...
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