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Zonal Overset-LES with stochastic volume forcing

Akkermans, Rinie and Bernicke, Paul and Ewert, Roland and Dierke, Jürgen (2018) Zonal Overset-LES with stochastic volume forcing. International Journal of Heat and Fluid Flow, 70, pp. 336-347. Elsevier. DOI: 10.1016/j.ijheatfluidflow.2017.11.005 ISBN 0142-727X ISSN 0142-727X

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Official URL: http://www.sciencedirect.com/science/article/pii/S0142727X1730379X

Abstract

In this contribution, a hybrid Zonal LES tool is presented that uses a stochastic volume forcing for inflow turbulence generation. The here used hybrid approach is based on an implementation of the Non-Linear Perturbation Equations extended with fluctuating viscous terms, denoted as Overset since a perturbation analysis is performed on top of a background flow. A turbulent flat plate is considered to investigate the generation of inflow turbulence and how this artificial turbulence is seeded into the computational domain. At the inflow region, turbulence is stochastically generated (in three-dimensional space and time) with the Fast Random Particle-Mesh method and subsequently injected in the Overset-LES domain with the eddy-relaxation source term. This eddy-relaxation source term is shown to pilot the hydrodynamics while leaving the acoustics untouched (i.e., transparent for acoustic). The application of the Overset-LES method to a NACA0012 trailing edge at zero angle-of-attack is furthermore presented. Mean flow and turbulence characteristics in the wake show a good agreement with experimental data. Finally, a possible way to couple the turbulent sound sources into a CAA simulation is described. Comparison between directivities obtained with this method and reference data revealed good agreement

Item URL in elib:https://elib.dlr.de/125420/
Document Type:Article
Title:Zonal Overset-LES with stochastic volume forcing
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Akkermans, RinieRinie.Akkermans (at) dlr.deUNSPECIFIED
Bernicke, PaulTU BraunschweigUNSPECIFIED
Ewert, Rolandroland.ewert (at) dlr.deUNSPECIFIED
Dierke, Jürgenjuergen.dierke (at) dlr.deUNSPECIFIED
Date:2018
Journal or Publication Title:International Journal of Heat and Fluid Flow
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:70
DOI :10.1016/j.ijheatfluidflow.2017.11.005
Page Range:pp. 336-347
Publisher:Elsevier
ISSN:0142-727X
ISBN:0142-727X
Status:Published
Keywords:Overset-LES, Volume forcing, Trailing-edge simulatio
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 - Simulation and Validation
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Dierke, Jürgen
Deposited On:03 Jan 2019 12:03
Last Modified:06 Sep 2019 15:26

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