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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 (2014) Computations of Separated Flows with Hybrid RANS/LES Approaches. Joint Symposium of DFG FOR 1066, DLR- C²A²S²E and DGLR: “Simulation of Wing and Nacelle Stall”, Braunschweig, Germany, 01. - 02. Dec. 2014.

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Abstract

In an effort to accurately compute nacelle stall processes, the research group FOR1066 (Simulation of Wing and Nacelle Stall) has been working extensively on the development of advanced simulation methods. Due to the high dependency of he separation aerodynamics on the turbulent structures developed within the boundary layer, embedded LES methods appear to be the only alternative 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.

Item URL in elib:https://elib.dlr.de/95283/
Document Type:Conference or Workshop Item (Speech)
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, RolfTU BraunschweigUNSPECIFIED
Reuß, Silviasilvia.reuss (at) dlr.deUNSPECIFIED
Probst, Axelaxel.probst (at) dlr.deUNSPECIFIED
Date:2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:hybrid RANS/LES, synthetic turbulence, TAU
Event Title:Joint Symposium of DFG FOR 1066, DLR- C²A²S²E and DGLR: “Simulation of Wing and Nacelle Stall”
Event Location:01. - 02. Dec. 2014
Event Type:international Conference
Event Dates:Braunschweig, Germany
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 of Aerodynamics and Flow Technology > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Deposited By: Micknaus, Ilka
Deposited On:12 May 2015 15:35
Last Modified:12 May 2015 15:35

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