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Towards overset LES for aeroacoustic source prediction

Bernicke, P. and Akkermans, R.A.D. and Ewert, Roland and Buchmann, N. (2015) Towards overset LES for aeroacoustic source prediction. 15th European Turbulence Conference, 25.-28. August 2015, Delft, The Netherlands.

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In this contribution an application of a computational aeroacoustics code (CAA) as a hybrid Zonal DNS tool is presented. The here used hybrid approach is based on a novel implementation of the Non-Linear Perturbation Equations (NLPE) extended with viscous terms, denoted as overset since a perturbation analysis is performed on top of a background flow. It is found that Direct Noise Computation results of a cylinder in uniform flow show the dipolar sound radiation characteristic as well as the expected decay of sound pressure level with distance. The extension to LES is illustrated with isotropic decaying turbulence, where the expected -5/3 slope of the reference DNS data is recovered with the LES employing the classical Smagorinsky model.

Item URL in elib:https://elib.dlr.de/102462/
Document Type:Conference or Workshop Item (Speech)
Title:Towards overset LES for aeroacoustic source prediction
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Akkermans, R.A.D.rinie.akkermans (at) dlr.deUNSPECIFIED
Ewert, Rolandroland.ewert (at) dlr.deUNSPECIFIED
Date:25 August 2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:LES, Aeroacoustics, Decaying Homogeneous Turbulence
Event Title:15th European Turbulence Conference
Event Location:Delft, The Netherlands
Event Type:international Conference
Event Dates:25.-28. August 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
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:02 Feb 2016 14:54
Last Modified:10 May 2016 23:43

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