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dc.contributor.author
 hal.structure.identifier
MARGNAT, Florent
118112 Institut Pprime [UPR 3346] [PPrime [Poitiers]]
dc.contributor.author
 hal.structure.identifier
GLOERFELT, Xavier
134975 Laboratoire de Dynamique des Fluides [DynFluid]
dc.date.accessioned2014
dc.date.available2014
dc.date.issued2014
dc.date.submitted2014
dc.identifier.issn0001-4966
dc.identifier.urihttp://hdl.handle.net/10985/8641
dc.description.abstractTwo assumptions commonly made in predictions based on Lighthill’s formalism are investigated: a constant density in the quadrupole expression, and the evaluation of the source quantity from incompressible simulations. Numerical predictions of the acoustic field are conducted in the case of a subsonic spatially evolving two-dimensional mixing layer at Re = 400. Published results of the direct noise computation (DNC) of the flow are use as reference and input for hybrid approaches before the assumptions on density are progressively introduced. Divergence free velocity fields are obtained from an incompressible simulation of the same flow case, exhibiting the same hydrodynamic field as the DNC. Fair comparisons of the hybrid predictions with the reference acoustic field valid both assumptions in the source region for the tested values of the Mach number. However, in the observer region, the inclusion of flow effects in the Lighthill source term is not preserved, which is illustrated through a comparison with the Kirchhoff wave-extrapolation formalism, and with the use of a convected Green function in the integration process.
dc.language.isoen_US
dc.publisherAcoustical Society of America
dc.rightsPost-print
dc.subjectaeroacoustics
dc.subjectacoustic analogies
dc.titleOn compressibility assumptions in aeroacoustic integrals: a numerical study with subsonic mixing layers
ensam.embargo.terms1 Month
dc.identifier.doi10.1121/1.4875561
dc.typdocArticle dans une revue avec comité de lecture
dc.localisationCentre de Paris
dc.subject.halSciences de l'ingénieur: Acoustique
ensam.audienceInternationale
ensam.page3252
ensam.journalJournal of the Acoustical Society of America
ensam.volume135
ensam.issue6
hal.identifierhal-01069755
hal.version1
hal.statusaccept
dc.identifier.eissn1520-8524


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