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Correction of aerodynamic influence matrices for transonic flow

Thormann, Reik and 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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Official URL: http://link.springer.com/article/10.1007/s13272-014-0114-3

Abstract

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.

Document Type:Article
Title:Correction of aerodynamic influence matrices for transonic flow
Authors:
AuthorsInstitution or Email of Authors
Thormann, Reikreik.thormann@dlr.de
Dimitrov, DilianaInstitut für Aeroelastik
Date:June 2014
Journal or Publication Title:CEAS Aeronautical Journal
Refereed publication:Yes
In Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI:10.1007/s13272-014-0114-3
Publisher:Springer
ISSN:1869-5590
Status:Published
Keywords:AIC, DLM Correction, CFD, Transonic flow, Unsteady flow
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: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulations
Deposited By: Reik Thormann
Deposited On:07 Aug 2014 13:37
Last Modified:07 Aug 2014 13:37

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