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Flutter Computations for a Generic Reference Aircraft Adopting CFD and Reduced Order Methods

Voß, Ralph und Thormann, Reik (2012) Flutter Computations for a Generic Reference Aircraft Adopting CFD and Reduced Order Methods. In: Proceedings AIAA 2012. AIAA 2012 - 53rd Structures, Structural Dynamics and Materials Conferences (SDM), 23.-26. Apr. 2012, Honolulu/Hawaii, USA.

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Kurzfassung

A new ROM for a CFD based flutter analysis at transonic and separated flow conditions is presented. It relies on a limited number of unsteady CFD computations forming the ROM data base, combined with an arbitrary number of Doublet Lattice computations. Thus compatibility with the standard DLM based linear flutter prediction process is conserved. The validation of this approach requires a common aeroelastic reference test case of adequate complexity. A brief review of available windtunnel data for both unsteady transonic aerodynamics and flutter outlines the shortcomings of these data, for example the lack of clear transonic dips at Mach numbers significantly below one, and of inverse shock motions. A new common test configuration with a transonic dip flutter boundary in the Mach number range between 0.80 and 0.95 is proposed. The aircraft geometry from the Drag-Prediction Workshop 4 fulfils the above mentioned unsteady aerodynamic requirements. It is extended to a flutter model of a generic aircraft. The capability of this model is demonstrated by applying the above flutter process. An unsteady aerodynamic ROM is generated in the 3 dimensional parameter space of Mach number, reduced frequency and elastic mode shape. For selected points of this parameter space a sufficient number of unsteady RANS simulations is performed to display unsteady pressure distributions at Mach numbers between 0.6 and 0.90, and reduced frequencies up to 2. A constant lift coefficient of 0.50 has been chosen for all Mach numbers. DLRs TAU code is applied using both harmonic forced motion and pulse responses for attached as well as for detached flow conditions. The ROM is completed by performing this procedure for several so called synthetic modes, which are chosen properly to display all realistic structural modes of the aircraft geometry, without their detailed knowledge.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Flutter Computations for a Generic Reference Aircraft Adopting CFD and Reduced Order Methods
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Voß, RalphNICHT SPEZIFIZIERT
Thormann, Reikreik.thormann@dlr.de
Datum:2012
Erschienen in:Proceedings AIAA 2012
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:ROM, CFD, flutter, reference configuration
Veranstaltungstitel:AIAA 2012 - 53rd Structures, Structural Dynamics and Materials Conferences (SDM)
Veranstaltungsort:Honolulu/Hawaii, USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:23.-26. Apr. 2012
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Simulation & Validierung
Standort: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik
Hinterlegt von: Daniela Erdmann
Hinterlegt am:19 Dez 2012 16:54
Letzte Änderung:19 Dez 2012 16:54

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