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A numerical phased array approach to model flow sound sources in aeroacoustic simulations
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0002-7006-067X
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-0176-5358
KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design. KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0003-4103-0129
(English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568Article in journal (Other academic) Submitted
Abstract [en]

An application of phased array methods to numerical data is presented, aimed at modelling flow sound sources from aeroacoustic simulations. Based on phased array data extracted from the compressible flow simulations, sound source strengths are computed on a set of points in the source region using phased array techniques assuming monopole propagation. Two phased array techniques are used to compute the source strengths: an approach using a Moore-Penrose pseudo-inverse and a beamforming approach using linear programming (LP) deconvolution. The first approach gives a model of correlated sources for the acoustic field generated from the flow expressed in a matrix of cross- and auto-power spectral values, whereas the second approach results in a model of uncorrelated sources expressed in a vector of auto-power spectral values. The accuracy of the model is estimated by computing the acoustic spectrum at a far-field observer. The modelling approach is tested first on an analytical case with known point sources. It is then applied to the example of the flow around a submerged air inlet. The far-field spectra obtained from the source models for two different flow conditions show a good agreement with the spectra obtained with a Ffowcs Williams and Hawkings integral. Various configurations for the phased array and for the sources are used. The LP beamforming approach shows better robustness to changes in the number of probes and sources than the pseudo-inverse approach. The good results obtained with this simulation case demonstrate the potential of the phased array approach as a modelling tool for aeroacoustic simulations. 

Place, publisher, year, edition, pages
Elsevier.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-192164OAI: oai:DiVA.org:kth-192164DiVA: diva2:958288
Note

QC 20160921

Available from: 2016-09-06 Created: 2016-09-06 Last updated: 2016-09-21Bibliographically approved

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Pignier, NicolasO'Reilly, Ciarán J.Boij, Susann
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Aeronautical and Vehicle EngineeringVinnExcellence Center for ECO2 Vehicle designMarcus Wallenberg Laboratory MWL
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Journal of Sound and Vibration
Fluid Mechanics and Acoustics

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