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Summary of Data from the Sixth AIAA CFD Drag Prediction Workshop: CRM Cases 2 to 5

Tinoco, Edward and Brodersen, Olaf and Keye, Stefan and Laflin, Kelly and Feltrop, Edward and Vassberg, John and Mani, Mori and Rider, Ben and Wahls, Richard and Morrison, Joseph and Hue, David and Gariepy, Martin and Roy, Christopher and Mavriplis, Dimitri and Murayama, Mitsuhiro (2017) Summary of Data from the Sixth AIAA CFD Drag Prediction Workshop: CRM Cases 2 to 5. In: AIAA 2017-1208. AIAA Science and Technology Forum and Exhibition (SciTech), 9.-13. Jan. 2017, Grapevine, USA.

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Official URL: http://www.aiaa.org/

Abstract

Results from the Sixth AIAA CFD Drag Prediction Workshop Common Research Model Cases 2 to 5 are presented. As with past workshops, numerical calculations are performed using industry-relevant geometry, methodology, and test cases. Cases 2 to 5 focused on force/moment and pressure predictions for the NASA Common Research Model wing-body and wing-body-nacelle-pylon configurations, including Case 2 - a grid refinement study and nacelle-pylon drag increment prediction study; Case 3 - an angle-of-attack buffet study; Case 4 – an optional wing-body grid adaption study; and Case 5 – an optional wing-body coupled aero-structural simulation. The Common Research Model geometry differed from previous workshops in that it was deformed to the appropriate static aeroelastic twist and deflection at each specified angle-of-attack. The grid refinement study used a common set of overset and unstructured grids, as well as user created Multiblock structured, unstructured, and Cartesian based grids. For the supplied common grids, six levels of refinement were created resulting in grids ranging from 7x106 to 208x106 cells. This study (Case 2) showed further reduced scatter from previous workshops, and very good prediction of the nacelle-pylon drag increment. Case 3 studied buffet onset at M=0.85 using the Medium grid (20 to 40x106 nodes) from the above described sequence. The prescribed alpha sweep used finely spaced intervals through the zone where wing separation was expected to begin. Although the use of the prescribed aeroelastic twist and deflection at each angle-of-attack greatly improved the wing pressure distribution agreement with test data, many solutions still exhibited premature flow separation. The remaining solutions exhibited a significant spread of lift and pitching moment at each angle-of-attack, much of which can be attributed to excessive aft pressure loading and shock location variation. Four Case 4 grid adaption solutions were submitted. Starting with grids less than 2x106 grid points, two solutions showed a rapid convergence to an acceptable solution. Four Case 5 coupled aerostructural solutions were submitted. Both showed good agreement with experimental data. Results from this workshop highlight the continuing need for CFD improvement, particularly for conditions with significant flow separation. These comparisons also suggest the need for improved experimental diagnostics to guide future CFD development.

Item URL in elib:https://elib.dlr.de/110121/
Document Type:Conference or Workshop Item (Speech)
Title:Summary of Data from the Sixth AIAA CFD Drag Prediction Workshop: CRM Cases 2 to 5
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tinoco, EdwardBoeing (retired)UNSPECIFIED
Brodersen, OlafO.Brodersen (at) dlr.deUNSPECIFIED
Keye, StefanStefan.Keye (at) dlr.deUNSPECIFIED
Laflin, KellyTextron AviationUNSPECIFIED
Feltrop, EdwardTextron AviationUNSPECIFIED
Vassberg, JohnBoeingUNSPECIFIED
Mani, MoriBoeingUNSPECIFIED
Rider, BenBoeingUNSPECIFIED
Wahls, Richardnasa langleyUNSPECIFIED
Morrison, Josephnasa langleyUNSPECIFIED
Hue, DavidONERAUNSPECIFIED
Gariepy, MartinEcole Polytechnique de MontrealUNSPECIFIED
Roy, ChristopherVirginia TechUNSPECIFIED
Mavriplis, Dimitriuniversity of wyomingUNSPECIFIED
Murayama, MitsuhirojaxaUNSPECIFIED
Date:11 January 2017
Journal or Publication Title:AIAA 2017-1208
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Aerodynamics, CFD Drag Prediction, NASA Common Research Model
Event Title:AIAA Science and Technology Forum and Exhibition (SciTech)
Event Location:Grapevine, USA
Event Type:international Conference
Event Dates:9.-13. Jan. 2017
Organizer:AIAA
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 - Flight Physics
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Brodersen, Dr.-Ing. Olaf
Deposited On:17 Jan 2017 13:54
Last Modified:17 Jan 2017 13:54

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