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Adjoint gradient-based approach for aerodynamic optimization of transport aircraft

Ilic, Caslav (2013) Adjoint gradient-based approach for aerodynamic optimization of transport aircraft. European Conference on Computational Optimization (EUCCO), July 17-19, 2013, Chemnitz, Germany.



Aerodynamic design of transport aircraft has been steadily improved over past several decades, to the point where today highly-detailed shape control is needed to achieve further improvements. Aircraft manufacturers are therefore increasingly looking into formal optimization methods, driving high-fidelity CFD analysis of finely-parametrized candidate designs. We present an adjoint gradient-based approach for maximizing the aerodynamic performance index relevant to cruise-climb mission segment by modifying the aircraft wing shape. The test baseline geometry is a wing-body configuration based on the Do-728 regional jet, over which a hybrid structured-unstructured CFD grid is generated. For primal and adjoint aerodynamic analysis we employ the DLR TAU flow solver in RANS mode, with Spalart-Allmaras turbulence model. In each optimization cycle, multiple flight points are evaluated in order to make the final shape more robust to off-design flight conditions. Constraints are placed on pitching moment and wing root bending moment, to counter shape modifications unfavorable to trimming and structural mass. The wing shape is modified by free-form deformation (FFD), with positions of FFD control points being the design parameters. An SQP optimizer is used to drive the optimization.

Item URL in elib:https://elib.dlr.de/86003/
Document Type:Conference or Workshop Item (Speech)
Title:Adjoint gradient-based approach for aerodynamic optimization of transport aircraft
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ilic, Caslavcaslav.ilic (at) dlr.deUNSPECIFIED
Date:July 2013
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:optimization, aerodynamic, adjoint, gradient
Event Title:European Conference on Computational Optimization (EUCCO)
Event Location:Chemnitz, Germany
Event Type:international Conference
Event Dates:July 17-19, 2013
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 - Flight Physics (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Ilic, Caslav
Deposited On:06 Dec 2013 14:08
Last Modified:31 Jul 2019 19:43

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