elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

Efficient polar optimization of transport aircraft in transonic RANS flow using adjoint gradient based approach

Ilic, Caslav and Widhalm, Markus and Brezillon, Joel (2012) Efficient polar optimization of transport aircraft in transonic RANS flow using adjoint gradient based approach. ECCOMAS 2012 (6th European congress on computational methods in applied sciences and engineering), September 10-14, 2012, Vienna.

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
610kB

Abstract

A major design requirement for transport aircraft is efficient cruise flight in the transonic region. From the aerodynamic viewpoint, this is achieved by favorable lift-to-drag ratio of the aircraft, both at the main design point and at off-design conditions. We therefore present a method to efficiently perform a multi-point optimization of a representative wing-body configuration. Designs are evaluated with RANS CFD simulations, the wing is parametrized using 40 free-form deformation control points, and a gradient-based method is used to drive the optimization. The gradient of cost functions is computed with a discrete adjoint approach, in which flow and mesh adjoint equations are solved. Compared to single-point optimization, with multi-point optimization we obtain a design with slightly lower best lift-to-drag ratio, but which has improved lift-to-drag polar over the whole range of practical lift coefficients compared to the baseline design.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Efficient polar optimization of transport aircraft in transonic RANS flow using adjoint gradient based approach
Authors:
AuthorsInstitution or Email of Authors
Ilic, Caslavcaslav.ilic@dlr.de
Widhalm, MarkusUNSPECIFIED
Brezillon, JoelUNSPECIFIED
Date:September 2012
Refereed publication:No
In ISI Web of Science:No
Status:Published
Keywords:aircraft, optimization, gradient, adjoint, multi-point, polar
Event Title:ECCOMAS 2012 (6th European congress on computational methods in applied sciences and engineering)
Event Location:Vienna
Event Type:international Conference
Event Dates:September 10-14, 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Transport Aircraft
Institute of Aerodynamics and Flow Technology
Institute of Aerodynamics and Flow Technology > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Deposited By: Caslav Ilic
Deposited On:04 Dec 2012 14:58
Last Modified:12 Dec 2013 21:53

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.