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Speeding-up the computation of high-lift aerodynamics using a residual-based reduced-order model

Mifsud, Michael and Zimmermann, Ralf and Görtz, Stefan (2015) Speeding-up the computation of high-lift aerodynamics using a residual-based reduced-order model. CEAS Aeronautical Journal, 6 (1), pp. 3-16. Springer. DOI: 10.1007/s13272-014-0125-0 ISSN 1869-5582

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1007/s13272-014-0125-0

Abstract

In this article, we propose a strategy for speeding-up the computation of the aerodynamics of industrial high-lift configurations using a residual-based reduced-order model (ROM). The ROM is based on the proper orthogonal decomposition (POD) of a set of solutions to the Navier–Stokes equations governing fluid flow at different parameter values, from which a set of orthogonal basis vectors is evaluated. By considering an initial set of few snapshots at different angles of attack, a ROM is constructed which is used to predict a solution at an angle of attack which is just outside the space spanned by the POD basis vectors. The ROM solution is subsequently used to initialize the flow solver for an accurate calculation of the aerodynamics at the same flow condition. This procedure is conducted repetitively for a series of angles of attack, whereby for each and every ROM prediction, the snapshots set is augmented with the latest CFD computed flow solution. Using this strategy, a considerable reduction in the total number of iterations to reach the converged steady-state solution is achieved when compared with conventional computational techniques used in industry for a series of computations such as drag polar computations. The methodology is applied and demonstrated on a two-element airfoil and a body-wing aircraft in high-lift configuration. Furthermore, an investigation is conducted on the behavior of the reduced-order modeling approach at angles of attack close to and within the static stall region, where aerodynamic hysteresis may occur and the aerodynamic coefficients are found to be multiple-valued functions of the angle of attack. It is revealed that by constructing the ROM from an appropriate set of basis vectors, it is also possible to model the resulting bifurcation.

Item URL in elib:https://elib.dlr.de/92834/
Document Type:Article
Title:Speeding-up the computation of high-lift aerodynamics using a residual-based reduced-order model
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mifsud, MichaelMichael.Mifsud (at) dlr.deUNSPECIFIED
Zimmermann, Ralfralf.zimmermann (at) dlr.deUNSPECIFIED
Görtz, StefanStefan.Goertz (at) dlr.deUNSPECIFIED
Date:March 2015
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:6
DOI :10.1007/s13272-014-0125-0
Page Range:pp. 3-16
Publisher:Springer
ISSN:1869-5582
Status:Published
Keywords:reduced-order model (ROM), proper orthogonal decomposition (POD), CFD, high-lift aerodynamics, TAU, hysteresis, reduced-order modeling, surrogate modeling
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 - Simulation and Validation
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Deposited By: Görtz, Stefan
Deposited On:25 Feb 2015 08:58
Last Modified:06 Sep 2019 15:24

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