15th European Turbulence Conference 2015
August 25-28th, 2015, Delft, The Netherlands
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Towards Overset LES for Aeroacoustic Source Prediction


Go-down etc15 Tracking Number 358

Presentation:
Session: Acoustics 1
Room: Room G
Session start: 10:30 Fri 28 Aug 2015

Paul Bernicke   p.bernicke@tu-braunschweig.de
Affifliation: Institute of FLuid Mechanics, TU Braunschweig, Germany
Rinie Akkermans   r.akkermans@tu-braunschweig.de
Affifliation: Institute of FLuid Mechanics, TU Braunschweig, Germany
Roland Ewert   roland.ewert@dlr.de
Affifliation: Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Braunschweig, Germany
Nadine Buchmann   n.buchmann@tu-braunschweig.de
Affifliation: Institute of FLuid Mechanics, TU Braunschweig, Germany
Juergen Dierke   juergen.dierke@dlr.de
Affifliation: Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Braunschweig, Germany

Topics: - Acoustics of turbulent flows, - Large eddy simulation and related techniques

Abstract:

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.