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RANS / CAA based prediction of NACA0012 broadband trailing edge noise and experimental validation

Ewert, R. und Appel, C. und Dierke, J. und Herr, M. (2009) RANS / CAA based prediction of NACA0012 broadband trailing edge noise and experimental validation. In: AIAA Paper 2009-3369. 15th AIAA/CEAS Aeroacoustics Conference, 11 - 13 May 2009, Miami, Florida.

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The prediction quality of a fast Computational Aeroacoustics (CAA) approach is studied for noise generated at a NACA 0012 trailing edge. Broadband spectra, the power law underlying their Mach number scaling, and the effect of Reynolds Number on the spectra are juxtaposed against published data from measurements and results from a semi-empirical prediction tool. The CAA method rests on the use of Reynolds Averaged Navier-Stokes (RANS) solutions to describe the turbulent flow problem around the airfoil. Acoustic Perturbation Equations (APE) are solved in the time domain, using a vortex source term, which is a function of turbulent field quantities. The acoustic approach was sccessfully validated in other works by utilizing turbulence data from Large Eddy Simulation (LES) to prescribe the unsteady sound sources. For the fast CAA approach applied in this work unsteady vortex sound sources are determined by a stochastic method, which generates 4D spatio-temporal synthetic turbulence that very accurately accompishes a local realization of all statistical and mean-flow features provided by steady RANS. Based on these prerequisites it becomes now feasible to make an assessment as to which acoustic accuracy can be achieved with such a hybrid RANS / CAA prediction method, bearing in mind the approximative nature and limited turbulence resolution of RANS:

Dokumentart:Konferenzbeitrag (Paper)
Titel:RANS / CAA based prediction of NACA0012 broadband trailing edge noise and experimental validation
AutorenInstitution oder E-Mail-Adresse der Autoren
Ewert, R.roland.ewert@dlr.de
Erschienen in:AIAA Paper 2009-3369
Referierte Publikation:Nein
In ISI Web of Science:Nein
Stichwörter:CAA, APE, FRPM
Veranstaltungstitel:15th AIAA/CEAS Aeroacoustics Conference
Veranstaltungsort:Miami, Florida
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:11 - 13 May 2009
Veranstalter :AIAA/CEAS
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:L VU - Luftverkehr und Umwelt (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L VU - Luftverkehr und Umwelt
DLR - Teilgebiet (Projekt, Vorhaben):L - Leiser Luftverkehr (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik
Hinterlegt von: Dr.-Ing. Roland Ewert
Hinterlegt am:26 Nov 2009 11:21
Letzte Änderung:12 Dez 2013 20:45

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