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A generic computational study of broadband high-lift noise generation for simplified slat and flap problems

Dierke, Jürgen and Appel, Christina and Siebert, Jona and Ewert, Roland (2012) A generic computational study of broadband high-lift noise generation for simplified slat and flap problems. 18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference), 04. - 06. Jun. 2012, Colorado Springs, CO, USA.

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Official URL: http://aiaa.org

Abstract

In previous work a RANS based simulation technique for the simulation of broadband slat noise was established. The computational approach is based on acoustic perturbation equations forced by stochastic sound sources to simulate sound generation and radiation in space and time. Good agreement was found between predicted and measured slat noise spectra and for trailing edge noise generated at a NACA 0012 airfoil. In this work the simulation approach is applied to generic high-lift noise problems defined in the framework of the European project VALIANT. The problems considered are sound generation at the slat and the flap of simplified high-lift geometries. Results of the time-averaged mean flow and turbulence statistics from RANS are evaluated and compared to measurements. A comparison of the statistics of the stochastic fluctuations computed with the stochastic turbulence model FRPM with flow data is provided. Sound generated by the stochastic source model is evaluated and compared to measurements. As a general outcome of the study, the agreement between the RANS flow fields to measurements is quite good. The reconstruction of the turbulence statistics by FRPM is in general accurate, but in some reagions it differes from the target statistic. The agreement of the acoustic far field predictions to the measured data is satisfyings. The overall procedure is with a computational effort of around two days quite short.

Item URL in elib:https://elib.dlr.de/78642/
Document Type:Conference or Workshop Item (Paper)
Title:A generic computational study of broadband high-lift noise generation for simplified slat and flap problems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dierke, Jürgenjuergen.dierke (at) dlr.deUNSPECIFIED
Appel, Christinachristina.appel (at) dlr.deUNSPECIFIED
Siebert, Jonajona.siebert (at) dlr.deUNSPECIFIED
Ewert, Rolandroland.ewert (at) dlr.deUNSPECIFIED
Date:2012
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:RPM, FRPM, acoustics, stochastic turbulence, VALIANT
Event Title:18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference)
Event Location:Colorado Springs, CO, USA
Event Type:international Conference
Event Dates:04. - 06. Jun. 2012
Organizer:AIAA/CEAS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Dierke, Jürgen
Deposited On:21 Nov 2012 09:40
Last Modified:21 Nov 2012 09:40

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