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Correction of aerodynamic influence matrices for transonic flow

Thormann, Reik und Dimitrov, Diliana (2014) Correction of aerodynamic influence matrices for transonic flow. CEAS Aeronautical Journal. Springer. DOI: 10.1007/s13272-014-0114-3. ISSN 1869-5590.

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Offizielle URL: http://link.springer.com/article/10.1007/s13272-014-0114-3

Kurzfassung

The authors present a novel correction approach for the doublet-lattice method in this paper. The doublet-lattice method is a standard tool for calculating unsteady aerodynamic loads in aeroelasticity. It solves the linear potential equations and is thus valid only at subsonic flow conditions. Hence, corrections have to be applied for transonic flow. The proposed correction method, CREAM (CorREction of Aerodynamic Matrices), uses surface pressure distributions obtained using computational fluid dynamics (CFD) simulations for the correction. It is based on a Taylor expansion of the aerodynamic influence coefficient matrix, where the Taylor coefficients are corrected successively. The approach can be applied to quasi-steady as well as to unsteady aerodynamic calculations. The method is demonstrated on the AGARD LANN wing at transonic attached flow conditions and compared to linearized unsteady CFD computations. Two different correction orders are examined: a ‘‘zeroth order correction’’ with a quasi-steady CFD sample as correction input and a ‘‘first order correction’’ with an additional unsteady CFD sample. It is shown that CREAM gives improved results for small reduced frequencies, where the first-order correction is always superior to the zeroth order correction.

Dokumentart:Zeitschriftenbeitrag
Titel:Correction of aerodynamic influence matrices for transonic flow
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Thormann, Reikreik.thormann@dlr.de
Dimitrov, DilianaInstitut für Aeroelastik
Datum:Juni 2014
Erschienen in:CEAS Aeronautical Journal
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI :10.1007/s13272-014-0114-3
Verlag:Springer
ISSN:1869-5590
Status:veröffentlicht
Stichwörter:AIC, DLM Correction, CFD, Transonic flow, Unsteady flow
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: Göttingen
Institute & Einrichtungen:Institut für Aeroelastik > Aeroelastische Simulationen
Hinterlegt von: Reik Thormann
Hinterlegt am:07 Aug 2014 13:37
Letzte Änderung:29 Jun 2015 03:04

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