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Surface and volme propagation methods for broadband sound prediction with synthetic turbulent sound sources

Ewert, Roland (2013) Surface and volme propagation methods for broadband sound prediction with synthetic turbulent sound sources. AIA-DAGA 2013 Conference on Acoustics, 18-21- März 2013, Merano, Italien.

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Abstract

One way to tackle the problem of noise generated aerodynamically at solid surfaces is based on surface integral methods. To capture sound radiation characteristics sufficiently accurate it is necessary to enclose with the surface the entire surface area that affects sound radiation. For airfoil trailing edge noise, for example, this means to wrap-up the entire airfoil to properly capture the multi-lobe radiation pattern. If surface data is not available everywhere, the unknowns of the problem can be obtained with the Boundary Element Method (BEM). High Helmholtz number problems such as aerodynamically generated sound refracted at full-scale aircraft become treatable with fast multi pole BEM. However, surface integral based methods cannot properly tackle refraction effects in non-uniform flow. In recent years different numerical perturbation methods have been developed for simulating the propagation of acoustic perturbations over a given non-uniform meanflow. The neglect of refraction effects can give rise to significant errors in the prediction of sound pressure levels. The applicability of stochastic methods generating synthetic turbulence for the fast prediction of turbulence related broadband sound has been studied in recent years. The coupling of synthetic turbulence methods to perturbation equations and fast multi pole BEM will be discussed.

Item URL in elib:https://elib.dlr.de/87460/
Document Type:Conference or Workshop Item (Speech)
Title:Surface and volme propagation methods for broadband sound prediction with synthetic turbulent sound sources
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ewert, Rolandroland.ewert (at) dlr.deUNSPECIFIED
Date:18 March 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Fast Multi-Pole BEM, Boundary Element Method, CAA, Synthetic Turbulence
Event Title:AIA-DAGA 2013 Conference on Acoustics
Event Location:Merano, Italien
Event Type:international Conference
Event Dates:18-21- März 2013
Organizer:DAGA
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 - Flight Physics (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Ewert, Dr.-Ing. Roland
Deposited On:14 Jan 2014 11:23
Last Modified:08 May 2014 23:20

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