Flow Modulation and Fluid-Structure Interaction at Airplane Wings

This volume presents results of the interdisciplinary research work from the collaborative research center SFB 401: "Flow Modulation and Fluid-Structure Interaction at Airplane Wings" at RWTH Aachen, Germany The research reported here comprises work from the first five years of its funding by the Deutsche Forschungsgemeinschaft, DFG. The center is concerned with fundamental problems of very high capacity aircraft with large elastic wings capable of transonic transport. In all of the 14 projects to date, the following laboratories have cooperated: Aircraft Design and Aeronautics, Aerodynamics, Lightweight Structures, Flight Dynamics, Geometry and Practical Mathematics, Numerical Mathematics, Scientific Computing and Mechanics. The work is still in progress and presently approved to continue until the end of 2005.

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The research work of the collaborative research center SFB401 Flow Modulation and Fluid-Structure Interaction at Airplane Wings at the Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen, which is reported in this book, was pos­ sible due to the financial support of the Deutsche Forschungsgemeinschaft (DFG). The proposal has been approved after evaluation by the referees of DFG selected from other universities and industry, which is gratefully acknowledged. The work is still in progress and now approved to continue until the end of year 2005. More than 50 scientists from universities of the United States, Russia, France, Italy, Japan, Great Britain, Sweden, Netherlands, Switzerland, Austria and research orga­ nizations NASA, ONERA, NLR, DLR could be invited and have visited the research center, gave seminars on their research on related topics and some of them stayed longer for joined work. Besides its scientific value, also the importance of the pro gram for scientific educa­ tion becomes evident by looking at the numbers of completed theses, which are up to now about 15 doctoral theses, 40 diploma theses and 70 study theses. The authors of this book acknowledge the valuable support coming from all these persons and institutions. They are especially grateful to the referees having reviewed this work, A. Cohen (Universite Pierre et Marie Curie), J. Cooper (Manchester School of Engineering), W. Devenport (Virginia Tech.), M. Drela (MIT), F. Gern (Avionics Specialties Inc.), A. Griewank (TU Dresden), H. Hönlinger (DLR), P.

Contenu

1 Introduction.- 2 Model Flow, Wakes and Vortices in High Lift Configuration.- 2.1 Experimental Analysis and Modulation of Vortices.- 2.2 Simulation of Vortex Sheets at Take-Off and Landing.- 2.3 Analysis of Wakes and Wake-Jet Interaction.- 2.4 Aerodynamic Design of Transonic Adaptive Airfoils with Natural Transition.- 2.5 Experiments in a Transonic Shock Tube at High Mach and Reynolds Numbers.- 3 Numerical Tools and Approaches for Flow Simulation with Local Adaptivity.- 3.1 H-Adaptive Multiscale Schemes for the Compressible Navier-Stokes Equations - Polyhedral Discretization, Data Compression and Mesh Generation.- 3.2 Automated Gradient Calculation.- 4 Computational and Experimental Aeroelasticity.- 4.1 On Well-Posedness and Modelling for Nonlinear Aeroelasticity.- 4.2 Concepts for Reduced Structural Models of Airplane Wings in Aeroelasticity.- 4.3 Computational Aeroelasticity with Reduced Structural Models.- 4.4 Approximated Nonlinear Stability Analysis of the Dynamics of Flexible Aircraft.- 4.5 Analysis of Unsteady Airfoils at Low Speeds.- 4.6 Experiments on Transonic Aerodynamics about Elastically Suspended Airfoils.- 4.7 Design, Qualification and Experimental Investigation on Flexible Wind-Tunnel Wing Models.