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Comparison between Gradient-free and Adjoint Based Aerodynamic Optimization of a Flying Wing Transport Aircraft in the Preliminary Design.

Widhalm, Markus and Arno, Ronzheimer and Martin, Hepperle (2007) Comparison between Gradient-free and Adjoint Based Aerodynamic Optimization of a Flying Wing Transport Aircraft in the Preliminary Design. American Institute of Aeronautics and Astronautics. AIAA 25th Applied Aerodynamics Conference, [2007-06-25 - 2007-06-28], AIAA Miami 4060, Miami, Florida, U.S.A..

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Abstract

This paper describes investigations of planform and shape optimizations for a flying wing transport aircraft with an Euler continuous adjoint method. For a prescribed lift the cost function will be the drag, which has to be minimized and implies a maximization of L/D. The results presented for the gradient based method using an adjoint solver are compared to an optimization performed with a gradient free approach. The different workflows and procedures will demonstrate the advantages and disadvantages of each particular optimization approach. The optimization procedure uses a freeform deformation technique for the design parameterization of the shape as well as for the surface mesh deformation required to determine the gradients. This combination of both tasks into one tool is advantageous because performing finite differences for evaluating the mesh sensitivities can be carried out with a constant grid topology. An example design case is also shown for demonstration purposes.

Item URL in elib:https://elib.dlr.de/50984/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Comparison between Gradient-free and Adjoint Based Aerodynamic Optimization of a Flying Wing Transport Aircraft in the Preliminary Design.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Widhalm, MarkusUNSPECIFIEDUNSPECIFIED
Arno, RonzheimerUNSPECIFIEDUNSPECIFIED
Martin, HepperleUNSPECIFIEDUNSPECIFIED
Date:26 June 2007
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Publisher:American Institute of Aeronautics and Astronautics
Status:Published
Keywords:Aerodynamic Optimisation, Adjoint, Gradient-free, Preliminary Design
Event Title:AIAA 25th Applied Aerodynamics Conference
Event Location:Miami, Florida, U.S.A.
Event Type:international Conference
Event Dates:[2007-06-25 - 2007-06-28], AIAA Miami 4060
Organizer:American Institute of Aeronautics and Astronautics
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 , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > CASE
Deposited By: Widhalm, Markus
Deposited On:06 Sep 2007
Last Modified:31 Jul 2019 19:20

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