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Comparison of Optimizer-Based and Flow Solver-Based Trimming in the Context of High-Fidelity Aerodynamic Optimization

Ilic, Caslav (2017) Comparison of Optimizer-Based and Flow Solver-Based Trimming in the Context of High-Fidelity Aerodynamic Optimization. In: New Results in Numerical and Experimental Fluid Mechanics XI, 136, pp. 455-465. Springer International Publishing. 20. DGLR/STAB Symposium, 8.-9.11.2016, Braunschweig, Deutschland. ISBN 978-3-319-64518-6. ISSN 1612-2909.

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Official URL: http://www.springer.com/de/book/9783319645186


This report compares two approaches for achieving a trimmed state of an aircraft configuration during an aerodynamic optimization. In the optimizer-based approach, balance equations are set as equality constraints to the optimizer. In the flow solver-based approach, balance equations are satisfied within the flow solver evaluation. These approaches are applied to a flying wing case, where blended trailing edge deflection is used to control the pitching moment. The wing is treated as rigid, and lift and pitching moment balance equations are taken into account for trimming. Tests are performed with varying numbers of shape design parameters and with varying numbers of flight points. Is is concluded that the flow solver-based approach performs more robustly, and thus should be preferred in general, even though it may take more time than the optimizer-based approach.

Item URL in elib:https://elib.dlr.de/118638/
Document Type:Conference or Workshop Item (Speech)
Title:Comparison of Optimizer-Based and Flow Solver-Based Trimming in the Context of High-Fidelity Aerodynamic Optimization
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Journal or Publication Title:New Results in Numerical and Experimental Fluid Mechanics XI
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 455-465
EditorsEmailEditor's ORCID iD
Dillmann, AndreasDLR GöttingenUNSPECIFIED
Heller, GerdAirbus BremenUNSPECIFIED
Krämer, EwaldUni StuttgartUNSPECIFIED
Wagner, ClausDLR GöttingenUNSPECIFIED
Bansmer, StephanTU BraunschweigUNSPECIFIED
Radespiel, RolfTU BraunschweigUNSPECIFIED
Semaan, RichardTU BraunschweigUNSPECIFIED
Publisher:Springer International Publishing
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Keywords:Optimization, aerodynamic, trimming, adjoint, gradient
Event Title:20. DGLR/STAB Symposium
Event Location:Braunschweig, Deutschland
Event Type:national Conference
Event Dates:8.-9.11.2016
Organizer:Deutsche Strömungsmechanische Arbeitsgemeinschaft
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 (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Seyfried, Beate
Deposited On:31 Jan 2018 14:29
Last Modified:31 Jan 2018 14:29

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