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CFD-Based Aeroelastic Sensitivity Study of a Low-Speed Flutter Demonstrator

1
Chair of Aerodynamics and Fluid Mechanics, Department of Mechanical Engineering, Technical University of Munich, Boltzmannstr. 15, D-85748 Garching, Germany
2
Institute of Aircraft Design, Department of Mechanical Engineering, Technical University of Munich, Boltzmannstr. 15, D-85748 Garching, Germany
*
Author to whom correspondence should be addressed.
Aerospace 2019, 6(3), 30; https://doi.org/10.3390/aerospace6030030
Received: 6 February 2019 / Revised: 22 February 2019 / Accepted: 1 March 2019 / Published: 6 March 2019
(This article belongs to the Special Issue Aeroelasticity)

Abstract

The goal of developing aircraft that are greener, safer and cheaper can only be maintained through significant innovations in aircraft design. An integrated multidisciplinary design approach can lead to an increase in the performance of future derivative aircraft. Advanced aerodynamics and structural design technologies can be achieved by both passive and active suppression of aeroelastic instabilities. To demonstrate the potential of this approach, the EU-funded project Flutter Free Flight Envelope Expansion for Economical Performance Improvement is developing an unmanned aerial vehicle with a high-aspect-ratio-wing and clearly defined flutter characteristics. The aircraft is used as an experimental test platform. The scope of this work is the investigation of the aeroelastic behaviour of the aircraft and the determination of its flutter limits. The modeling of unsteady aerodynamics is performed by means of the small disturbance CFD approach that provides higher fidelity compared to conventional linear-potential-theory-based methods. The CFD-based and the linear-potential-theory-based results are compared and discussed. Furthermore, the sensitivity of the flutter behaviour to the geometric level of detail of the CFD model is evaluated. View Full-Text
Keywords: computational aeroelasticity; SD-CFD; linearized CFD; FLEXOP; flutter analysis; antisymmetric boundary condition; flutter demonstrator; stability analysis; sensitivity study computational aeroelasticity; SD-CFD; linearized CFD; FLEXOP; flutter analysis; antisymmetric boundary condition; flutter demonstrator; stability analysis; sensitivity study
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Rozov, V.; Volmering, A.; Hermanutz, A.; Hornung, M.; Breitsamter, C. CFD-Based Aeroelastic Sensitivity Study of a Low-Speed Flutter Demonstrator. Aerospace 2019, 6, 30.

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