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Computations of Separated Flows with Hybrid RANS/LES Approaches

François, Daniela Gisele and Radespiel, Rolf and Reuß, Silvia and Probst, Axel (2015) Computations of Separated Flows with Hybrid RANS/LES Approaches. In: Adances in Simulation of Wing and Nacelle Stall Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 131 (1). Springer International Publishing. pp. 23-39. ISBN 978-3-319-21126-8. ISSN 1612-2909

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Official URL: http://link.springer.com

Abstract

In an effort to accurately compute nacelle stall processes, the research unit FOR1066 (Simulation of Wing and Nacelle Stall) has been working extensively on the development of advanced simulation methods. Due to the high dependency of the separation aerodynamics on the turbulent structures developed within the boundary layer, embedded LES methods appear promising to reliably compute such processes. Nevertheless, these approaches are characterized by exhibiting a very long “grey area“ (also known as adaptation distance) that may lead to the degradation of the whole solution. To shorten this adaptation distance, an advanced synthetic turbulence generator is implemented that forces the development of resolved turbulence at the inlet of the LES domain. The implementation is accessed for a zero pressure gradient flat plate, the HGR-01 airfoil, and a subsonic flow-through nacelle case. The numerical results are validated against experimental data and compared with numerical results without applying synthetic turbulence forcing. Results show that the implementation considerably reduces the required adaptation distance enhancing the overall solution. However, the success of the computation also depends on the solver numerical settings and the grid resolution. Advances in Simulation of Wing and Nacelle Stall Advances in Simulation of Wing and Nacelle Stall Look

Item URL in elib:https://elib.dlr.de/99765/
Document Type:Contribution to a Collection
Additional Information:Results of the Closing Symposium of the DFG Research Unit FOR 1066, December 1-2, 2014, Braunschweig, Germany
Title:Computations of Separated Flows with Hybrid RANS/LES Approaches
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
François, Daniela GiseleInstitute of Fluid Mechanics, Technische Universität BraunschweigUNSPECIFIED
Radespiel, RolfTechnische Universität Braunschweig, Institut für StrömungsmechanikUNSPECIFIED
Reuß, Silviasilvia.reuss (at) dlr.deUNSPECIFIED
Probst, Axelaxel.probst (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Adances in Simulation of Wing and Nacelle Stall
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:131
DOI :10.1007/978-3-319-21127-5_2
Page Range:pp. 23-39
Editors:
EditorsEmail
Radespiel, RolfTU-BS
Niehuis, ReinhardUniBW München
Kroll, NorbertDLR
Behrends, KathrinUni BS
Publisher:Springer International Publishing
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
ISSN:1612-2909
ISBN:978-3-319-21126-8
Status:Published
Keywords:hybrid RANS/LES, synthetic turbulence, TAU
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: Göttingen , Stuttgart
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Deposited By: Micknaus, Ilka
Deposited On:27 Nov 2015 16:08
Last Modified:22 Jan 2018 16:50

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