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

Ewert, R. and Appel, C. and Dierke, J. and 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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Abstract

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:

Document Type:Conference or Workshop Item (Paper)
Title:RANS / CAA based prediction of NACA0012 broadband trailing edge noise and experimental validation
Authors:
AuthorsInstitution or Email of Authors
Ewert, R.roland.ewert@dlr.de
Appel, C.UNSPECIFIED
Dierke, J.UNSPECIFIED
Herr, M.UNSPECIFIED
Date:2009
Journal or Publication Title:AIAA Paper 2009-3369
Refereed publication:No
In ISI Web of Science:No
Status:Published
Keywords:CAA, APE, FRPM
Event Title:15th AIAA/CEAS Aeroacoustics Conference
Event Location:Miami, Florida
Event Type:international Conference
Event Dates:11 - 13 May 2009
Organizer:AIAA/CEAS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: Dr.-Ing. Roland Ewert
Deposited On:26 Nov 2009 11:21
Last Modified:12 Dec 2013 20:45

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