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Hybrid RANS/LES investigation of the interaction of a longitudinal vortex with an inclined airfoil

Probst, Silvia and Landa, Tim and Knopp, Tobias and Radespiel, Rolf (2018) Hybrid RANS/LES investigation of the interaction of a longitudinal vortex with an inclined airfoil. In: Progress in Hybrid RANS-LES Modelling. 7th Symposium on Hybrid RANS-LES Methods, 17.-19. Sep. 2018, Berlin, Deutschland.

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Official URL: https://hrlm7.sciencesconf.org/

Abstract

Engine nacelles of modern commercial aircraft are often equipped with small vortex generators (strakes) to avoid early flow separation of the adverse-pressure-gradient boundary layer on the main wing in low-speed flight. In numerical flow simulations, conventional RANS models show a tendency to overly dissipate these free vortices. Therefore, we study an application scenario for hybrid RANS-LES methods to account for longitudinal vortices and their interaction with airfoils, in order to clarify some open questions: the grey-area problem for free vortices and the extension of synthetic turbulence to such large-scale turbulent structures, the influence of mesh design and resolution, as well as the modelling of the RANS and LES regions over the airfoil. Three approaches are compared: Firstly, pure IDDES is employed with its inherent switching mechanism to wall-modelled LES. Secondly, the switching in the IDDES is controlled by algebraic sensors which activate the WM-LES and the injection of synthetic turbulence upstream of the interaction region of the free vortex with the attached boundary layer. Thirdly, the entire boundary layer is treated in RANS mode.

Item URL in elib:https://elib.dlr.de/119828/
Document Type:Conference or Workshop Item (Speech)
Title:Hybrid RANS/LES investigation of the interaction of a longitudinal vortex with an inclined airfoil
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Probst, Silviasilvia.probst (at) dlr.deUNSPECIFIED
Landa, TimTechnische Universität Braunschweig, Institut für StrömungsmechanikUNSPECIFIED
Knopp, Tobiastobias.knopp (at) dlr.deUNSPECIFIED
Radespiel, RolfTechnische Universität Braunschweig, Institut für StrömungsmechanikUNSPECIFIED
Date:September 2018
Journal or Publication Title:Progress in Hybrid RANS-LES Modelling
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Status:Published
Keywords:numerische Simulation, Turbulenzmodellierung, hybride RANS/LES, freie Wirbel
Event Title:7th Symposium on Hybrid RANS-LES Methods
Event Location:Berlin, Deutschland
Event Type:international Conference
Event Dates:17.-19. Sep. 2018
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
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > CASE, GO
Deposited By: Probst, Dr. Silvia
Deposited On:07 Nov 2018 16:30
Last Modified:08 Nov 2018 13:50

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