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Time-linearized simulation of unsteady transonic flows with shock-induced separation

Thormann, Reik und Nitzsche, Jens und Widhalm, Markus (2012) Time-linearized simulation of unsteady transonic flows with shock-induced separation. In: Proceedings of the 6th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012). TU Wien. ECCOMAS 2012 - 6th European Congress on Computational Methods in Applied Siences and Engineering, 10.-14. Sept. 2012, Wien, Österreich. ISBN 978-3-9502481-9-7.

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Kurzfassung

During flutter analysis of a new aircraft a huge number of unsteady aerodynamic simulations is necessary in the parameter space consisting of Mach number, aeroelastic trim state, structural mode shape and frequency. For subsonic flow conditions fast potential methods like the Doublet Lattice Method can be applied. In the transonic regime unsteady flow perturbations depend on the mean flow state and CFD methods have to be employed. However, solving the nonlinear unsteady RANS equations for thousands of parameter combinations is not applicable. Hence, faster CFD methods are needed to reduce the computational costs. Assuming small time-harmonic perturbations, the RANS equations can be linearized around the steady mean solution. The latter are preferably solved in the frequency domain. This results in a large, sparse linear system for the perturbation of the fluid unknowns. In this paper an efficient time-linearized solver (LFD-TAU) is presented with special focus on 2-d external flows with strong shock-induced separation. The results are compared to small-amplitude pulse response and single-frequency RANS simulations, demonstrating good agreement over a wide frequency range. Even under pre-buffet flow conditions, showing aerodynamic resonance peaks, the resonance frequency is captured well, while the amplitudes are overestimated.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Time-linearized simulation of unsteady transonic flows with shock-induced separation
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Thormann, Reikreik.thormann@dlr.de
Nitzsche, Jensjens.nitzsche@dlr.de
Widhalm, Markusmarkus.widhalm@dlr.de
Datum:2012
Erschienen in:Proceedings of the 6th European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Eberhardsteiner, JosefTU Wien
Böhm, Helmut J.TU Wien
Rammerstorfer, Franz G.TU Wien
Verlag:TU Wien
ISBN:978-3-9502481-9-7
Status:veröffentlicht
Stichwörter:unsteady aerodynamics, linearization, transonic, separation
Veranstaltungstitel:ECCOMAS 2012 - 6th European Congress on Computational Methods in Applied Siences and Engineering
Veranstaltungsort:Wien, Österreich
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:10.-14. Sept. 2012
Veranstalter :TU Wien
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 17:01
Letzte Änderung:19 Dez 2012 17:01

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