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An Algebraic Sensor for the RANS-LES Switch in Delayed Detached-Eddy Simulation

Knopp, Tobias and Probst, Axel (2013) An Algebraic Sensor for the RANS-LES Switch in Delayed Detached-Eddy Simulation. In: New Results in Numerical axperimental Fluid Mechanics VIII Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 121. Springer Verlag, Heidelberg New York Dordrecht London. pp. 457-464. doi: 10.1007/978-3-642-35680-3_54. ISBN 978-3-642-35679-7.

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Official URL: http://link.springer.com/chapter/10.1007%2F978-3-642-35680-3_54


A new hybrid RANS-LES method of DDES-type for flows over airfoil sections with small/incipient separation is presented. It alters the RANS-LES switch based on the function fd in the DDES formulation. Regions of attached boundary layer flow, the separation point and the subsequent region of separation are detected by sensors. They are based on a combination of algebraic properties of the mean velocity profiles in wall-normal direction and of integral boundary layer quantities, namely the shape factor H12. While the RANS length scale lRANS is used in attached boundary layers, the LES length scale CDESΔ is used in regions of separated flow. In particular, thin regions of (incipiently) separated flow are treated in LES mode except for a near-wall region where lRANS is used. Moreover, in the vicinity of the separation point or in the entire separation region, a stochastic SGS model can be used as a simple method to force the generation of turbulent content.

Item URL in elib:https://elib.dlr.de/82359/
Document Type:Contribution to a Collection
Additional Information:Online ISBN: 978-3-642-35680-3, DOI: 10.1007/978-3-642-35680-3_54
Title:An Algebraic Sensor for the RANS-LES Switch in Delayed Detached-Eddy Simulation
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Knopp, Tobiastobias.knopp (at) dlr.deUNSPECIFIED
Probst, Axelaxel.probst (at) dlr.deUNSPECIFIED
Journal or Publication Title:New Results in Numerical axperimental Fluid Mechanics VIII
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1007/978-3-642-35680-3_54
Page Range:pp. 457-464
EditorsEmailEditor's ORCID iD
Heller, GerdAirbus Deutschland, Bremen, GermanyUNSPECIFIED
Nitsche, WolfgangTU Berlin, Berlin, GermanyUNSPECIFIED
Peltzer, InkenBeechcraft Berlin aviation GmbH, Schönefeld, GermanyUNSPECIFIED
Publisher:Springer Verlag, Heidelberg New York Dordrecht London
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Keywords:RANS-LES Switch, integral boundary layer
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Göttingen
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 May 2013 16:13
Last Modified:02 Mar 2015 15:19

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