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Hybrid RANS/LES Study of the Development of an Airfoil-Generated Vortex

Reuß, Silvia and Probst, Axel and Knopp, Tobias and Wawrzinek, Katharina (2015) Hybrid RANS/LES Study of the Development of an Airfoil-Generated Vortex. In: Adances in Simulation of Wing and Nacelle Stall Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 131. Springer International Publishing. pp. 41-54. ISBN 978-3-319-21126-8. ISSN 1612-2909

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

Abstract

We consider the numerical simulation of a generic lateral vortex, that is generated by a rapidly deflected NACA0021 airfoil. We use the SST k-ω URANS approach and a hybrid RANS-LES method based on the SST model, where a zonal RANS-LES interface is located little downstream of the airfoil trailing edge. The results are assessed by reference with the experimental data. The mean flow behavior and the induced angle of attack of the vortex can be predicted satisfactorily by the URANS approach and the improvement using hybrid RANS/LES is small. The hybrid RANS/LES results exhibit a delayed shear layer instability of the wake, and the arising 2D roller type vortices lead to a significant overprediction of the turbulent shear stress. We then apply a stochastic forcing in the region of the airfoil trailing edge. This leads to a fast generation of turbulent content in the wake and clearly improves the predictions for the turbulent stresses.

Item URL in elib:https://elib.dlr.de/99767/
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:Hybrid RANS/LES Study of the Development of an Airfoil-Generated Vortex
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Reuß, Silviasilvia.reuss (at) dlr.deUNSPECIFIED
Probst, Axelaxel.probst (at) dlr.deUNSPECIFIED
Knopp, Tobiastobias.knopp (at) dlr.deUNSPECIFIED
Wawrzinek, KatharinaInstitute of Aerodynamics and Gas Dynamics, Universität StuttgartUNSPECIFIED
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_3
Page Range:pp. 41-54
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, Vortex generation, 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 16:07
Last Modified:22 Jan 2018 16:50

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