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An Adjoint-based Aerodynamic Shape Optimization Strategy for Trimmed Aircraft with Active Engines

Merle, Andrei and Stück, Arthur and Rempke, Arne (2017) An Adjoint-based Aerodynamic Shape Optimization Strategy for Trimmed Aircraft with Active Engines. In: 35th AIAA Applied Aerodynamics Conference, AIAA AVIATION Forum. 35th AIAA Applied Aerodynamics Conference, AIAA AVIATION Forum, 5.-9. Jun 2017, Denver, CO. DOI: 10.2514/6.2017-3754

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Official URL: https://arc.aiaa.org/action/showCitFormats?href=%2Fdoi%2F10.2514%2F6.2017-3754&title=An+Adjoint-based+Aerodynamic+Shape+Optimization+Strategy+for+Trimmed+Aircraft+with+Active+Engines&doi=10.2514%2F6.2017-3754

Abstract

An adjoint-based Trim-Corrected Optimization Strategy (TCOS) with active engines is presented with applications to a three-dimensional modern transport aircraft configuration. The airframe drag is minimized using a gradient-based optimization algorithm by adapting the shape parameters alone while a trim process guarantees by means of the trim parameters that the design satisfies the aircrafts steady-state equilibrium of forces and moments. Following this approach, the sensitivity of the objective function is corrected in order to be consistent with the trim constraints. The backbone of the design evaluation process is the HPC-based environment FlowSimulator allowing for an in-memory data exchange between the involved primal tools and their dual counterparts. These are a freeform deformation parametrization, a mesh deformation method based on the linear elasticity analogy preserving the fuselage shape during the horizontal tail plane deflection and the finite-volume RANS solver TAU including the numerical engine treatment and a fully differentiated discrete-adjoint implementation. Several optimization studies were performed to quantify the impact of an active and controlled engine on the optimization result, but also to compare the TCOS performance against that of a conventional gradient-based Direct Optimization Strategy (DOS) in which the trim constraints and parameters are explicitly handled by the optimization algorithm. TCOS was found to achieve similar overall drag reductions as DOS. However, TCOS was able to significantly reduce the drag during the first few iterations while resulting in a feasible design in every optimization iteration.

Item URL in elib:https://elib.dlr.de/116358/
Document Type:Conference or Workshop Item (Speech)
Title:An Adjoint-based Aerodynamic Shape Optimization Strategy for Trimmed Aircraft with Active Engines
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Merle, AndreiAndrei.Merle (at) dlr.deUNSPECIFIED
Stück, ArthurArthur.Stueck (at) dlr.deUNSPECIFIED
Rempke, ArneArne.Rempke (at) dlr.deUNSPECIFIED
Date:June 2017
Journal or Publication Title:35th AIAA Applied Aerodynamics Conference, AIAA AVIATION Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2017-3754
Editors:
EditorsEmail
UNSPECIFIEDAmerican Institute of Aeronautics and Astronautics
Status:Published
Keywords:RANS, adjoint, optimization, active engines
Event Title:35th AIAA Applied Aerodynamics Conference, AIAA AVIATION Forum
Event Location:Denver, CO
Event Type:international Conference
Event Dates:5.-9. Jun 2017
Organizer:American Institute for Aeronautics and Astronautics (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 - VicToria, L - Simulation and Validation
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > CASE, BS
Deposited By: Merle, Andrei
Deposited On:05 Dec 2017 14:19
Last Modified:05 Dec 2017 14:19

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