E-Book, Englisch, Band 109, 420 Seiten, eBook
Reihe: Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Results of the Collaborative Research Center SFB 401 at the RWTH Aachen University, Aachen, Germany, 1997-2008
E-Book, Englisch, Band 109, 420 Seiten, eBook
Reihe: Notes on Numerical Fluid Mechanics and Multidisciplinary Design
ISBN: 978-3-642-04088-7
Verlag: Springer
Format: PDF
Kopierschutz: Wasserzeichen (»Systemvoraussetzungen)
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Weitere Infos & Material
Vortex Sheets of Aircraft in Takeoff and Landing.- An Adaptive Implicit Finite Volume Scheme for Compressible Turbulent Flows about Elastic Configurations.- Timestep Control for Weakly Instationary Flows.- Adaptive Multiscale Methods for Flow Problems: Recent Developments.- Interaction of Wing-Tip Vortices and Jets in the Extended Wake.- Experimental and Numerical Investigation of Unsteady Transonic Airfoil Flow.- Enabling Technologies for Robust High-Performance Simulations in Computational Fluid Dynamics.- Influencing Aircraft Wing Vortices.- Development of a Modular Method for Computational Aero-structural Analysis of Aircraft.- A Unified Approach to the Modeling of Airplane Wings and Numerical Grid Generation Using B-Spline Representations.- Parallel and Adaptive Methods for Fluid-Structure-Interactions.- Iterative Solvers for Discretized Stationary Euler Equations.- Unsteady Transonic Fluid - Structure - Interaction at the BAC 3-11 High Aspect Ratio Swept Wing.- Structural Idealization of Flexible Generic Wings in Computational Aeroelasticity.- Aero-structural Dynamics Experiments at High Reynolds Numbers.
"Development of a Modular Method for Computational Aero-structural Analysis of Aircraft (S. 205-206)
Lars Reimer, Carsten Braun, GeorgWellmer, Marek Behr, and Josef Ballmann
Abstract. This paper outlines the development of the aero-structural dynamics method SOFIA over the duration of the Collaborative Research Center SFB 401. The algorithms SOFIA applies for the spatial and the temporal aero-structural dynamics coupling are presented. It is described in particular how SOFIA’s load and deformation transfer algorithms suitable for non-matching grids at the coupling interface were enhanced towards the application to complete aircraft configurations. The application of SOFIA to various subsonic and transonic aeroelastic test cases is discussed.
1 Introduction
The design of high-performance wings for large commercial aircraft requires the inclusion of their aeroelastic properties into the aerodynamic and structural design process. During preliminary design, the geometry of the wing is defined as a compromise between good flight performance during take-off, landing and cruise flight on the one hand and load capacity and weight of the structure on the other hand. In an iterative fashion, the aerodynamic shape, the loads, the construction of the wing assembly and the deformation are studied sequentially and more or less independently. Aerodynamic wind tunnel testing with rigid or nearly-rigid reduced-scale models plays a key role.
But in those tests, similarity with the full scale body can only be achieved in a very limited manner, primarily with respect to the aerodynamic parameter Mach number and to a certain extent also with respect to the Reynolds number. Aeroelastic similarity is usually not achieved. Based on the aerodynamic analysis, wing loads, deformations and particularly the aerodynamic twist are determined. Then the wing geometry and construction of the wing assembly are modi- fied a posteriori so that after taking into account the static aeroelastic deformation in cruise flight sufficient lift and minimum drag are ensured.
The described design and construction procedure requires several iterations because in every step the aeroelastic coupling and the nonlinearity of the problem cannot be captured completely. Besides that, nonlinear flutter possibly occuring in the transonic flow regime cannot be predicted with such a procedure. Therefore it is necessary to develop numerical methods, which reliably predict the interaction between aerodynamic, structural and inertial forces. Such a numerical method has been progressively developed in the past four funding periods of the Collaborative Research Center SFB 401 Flow Modulation and Fluid-Structure Interaction at Airplane Wings at RWTH Aachen University. This paper gives an overview about this numerical method named SOFIA and its past and present development stages. The organization of the subsequent sections of this paper is as follows."
