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Efficient Computation of Dynamic Stability Data with a Linearized Frequency Domain Solver.

Widhalm, Markus und Dwight, Richard und Thormann, Reik und Hübner, Andreas (2010) Efficient Computation of Dynamic Stability Data with a Linearized Frequency Domain Solver.

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Determination of aeroelastic stability boundaries for full aircraft configu- rations by solving the time-accurate unsteady Reynolds-averaged Navier-Stokes (RANS) equations is recognized as extremely computationally expensive or impractical. This is due to the wide range of flight conditions, frequencies, and structural deformation mode shapes that must be examined to ensure a configuration is free from flutter. Nonetheless there is an increasing demand within the aerospace industry for accurate utter analysis in the transonic regime, which can only be satisfied with the use of high-fidelity RANS codes. Hence we are motivated to seek a more efficient numerical method. By assuming that perturbations to the ow are small and harmonic, we can derive an efficient alternative method by linearization of the RANS equations, a linearized frequency domain (LFD) solver. With this approach the unsteady simulation reduces to a single non-linear steady computation followed by a single linear simulation in the frequency-domain. This method is not new, but has principally been applied to turbomachinery so far. The contribution of this paper twofold: firstly to show that LFD is sufficiently accurate and reliable for applications to aeroelastic problems that occur in external aerodynamics, and secondly to demonstrate the speed-up that can be expected over full unsteady computations. Viscous transonic analysis is carried out on complex geometries in three-dimensions. The results show good agreement with full unsteady simulation and experiment, and a reduction in computational costs up to one order of magnitude is demonstrated.

Titel:Efficient Computation of Dynamic Stability Data with a Linearized Frequency Domain Solver.
AutorenInstitution oder E-Mail-Adresse der Autoren
Widhalm, MarkusMarkus.Widhalm@dlr.de
Dwight, RichardDLR
Thormann, ReikDLR
Hübner, AndreasDLR
Datum:Juni 2010
Referierte Publikation:Nein
Stichwörter:dynamic stability data, linearized frequency domain, efficient linear solver
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Flugzeuge
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Aircraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Simulation und Validierung
Standort: Braunschweig , Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Institut für Aeroelastik > Aeroelastische Simulationen
Hinterlegt von: Markus Widhalm
Hinterlegt am:31 Aug 2010 11:23
Letzte Änderung:09 Feb 2015 09:41

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