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Gradient-based Optimization of a flexible long-range transport Aircraft using a high-dimensional CAD-ROM Parameterization

Merle, Andrei and Ronzheimer, Arno and Bekemeyer, Philipp and Görtz, Stefan and Keye, Stefan and Reimer, Lars (2018) Gradient-based Optimization of a flexible long-range transport Aircraft using a high-dimensional CAD-ROM Parameterization. In: DLRK. Deutscher Luft- und Raumfahrtkongress 2018, 4.-6. Sep. 2018, Friedrichshafen.

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Official URL: https://dlrk2018.dglr.de/

Abstract

A gradient-based aeroelastic shape optimization framework making use of a reduced or model to substitute a parameterization based on computer-aided design software is presented. The design software is used initially to generate a parametric model of a three-dimensional transport aircraft configuration. To streamline the actual optimization process, the computer-aided design model is replaced with a parametric reduced order model based on proper orthogonal decomposition that is capable of predicting discrete surface displacement fields as a function of the design parameters. During the optimization, surface displacements are computed according to the current design parameters and applied on the baseline shape. In every optimization step, the aircraft's steady-state equilibrium of forces and moments are satisfied by a trimming algorithm and the Reynolds-averaged Navier-Stokes solver TAU is coupled with a linear structural finiteelement method model. Gradients are computed analytically by using geometric sensitivities provided by the reduced order model and by applying the adjoint method to the flow solver and the mesh deformation tool. The workflow is embedded within FlowSimulator, a multiphysics environment for high performance computing. The optimization process is demonstrated for a high-dimensional wing parameterization with 126 degrees of freedom. The aircraft cruise drag could be significantly reduced by 6% on a series of three continuously refined meshes for the aerodynamic analysis. For an accurate representation of the optimal shape by the computer-aided design software after the optimization, the approximation error introduced by the reduced order modelling approach must be sufficiently small. Therefore, the accuracy of the predictions was analyzed. The results identify the main source of the geometric error and quantify their effect on the drag reduction gained by the optimization.

Item URL in elib:https://elib.dlr.de/123450/
Document Type:Conference or Workshop Item (Speech)
Title:Gradient-based Optimization of a flexible long-range transport Aircraft using a high-dimensional CAD-ROM Parameterization
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Merle, AndreiAndrei.Merle (at) dlr.deUNSPECIFIED
Ronzheimer, ArnoArno.Ronzheimer (at) dlr.deUNSPECIFIED
Bekemeyer, PhilippPhilipp.Bekemeyer (at) dlr.deUNSPECIFIED
Görtz, StefanStefan.Goertz (at) dlr.deUNSPECIFIED
Keye, StefanStefan.Keye (at) dlr.deUNSPECIFIED
Reimer, LarsLars.Reimer (at) dlr.deUNSPECIFIED
Date:5 September 2018
Journal or Publication Title:DLRK
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Optimization, MDO, VicToria, CAD-ROM, Parameterization, RANS, Adjoint
Event Title:Deutscher Luft- und Raumfahrtkongress 2018
Event Location:Friedrichshafen
Event Type:national Conference
Event Dates:4.-6. Sep. 2018
Organizer:DGLR e.V.
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 - VicToria
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > CASE, BS
Institute for Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Merle, Andrei
Deposited On:10 Dec 2018 16:47
Last Modified:10 Dec 2018 16:47

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