The Collaborative Research Center SFB 401: Flow Modulation and Fluid-Structure Interaction at Airplane Wings investigates numerically and experimentally fundamental problems of very high capacity aircraft having large elastic wings. This issue summarizes the findings of the 12-year research program at RWTH Aachen University which was funded by the Deutsche Forschungsgemeinschaft (DFG) from 1997 through 2008. The research program covered the following three main topics of large transport aircraft: (i) Model flow, wakes, and vortices of airplanes in high-lift-configuration, (ii) Numerical tools for large scale adaptive flow simulation based on multiscale analysis and a parametric mapping concept for grid generation, and (iii) Validated computational design tools based on direct aeroelastic simulation with reduced structural models.

Zusammenfassung
In this issue of Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM) the results of the collaborative research center SFB 401 Flow Modulation and Fluid-Structure Interaction at Airplane Wings at the Rheinisch-Westf¨ alische Technische Hochschule (RWTH) Aachen University are reported. The funding was provided by the Deutsche Forschungsgeme- schaft (DFG). The research was performed from 1997 through 2008 and on the average consisted of more than 14 subprojects per year. Approximately 110 scientists from universities of the Austria, Belgium, France, Great Britain, Italy, Japan, Netherlands, Russia, South Korea, S- den, Switzerland, United States, and international research organizations such as DLR, NASA, NLR, ONERA were invited. The distinct scientists from all over the world gave seminars on topics related to the research ?elds tackled in the collaborative research center SFB 401. Some of them stayed for just a few days, others were hosted for a longer time to intensify the joint research. Besidesthescienti?cvaluetheFlow Modulation and Fluid-StructureInt- action at Airplane Wings programpossessesapronouncededucationalmerit. This becomes evident by the fact that 35 doctoral theses, 80 diploma theses, and 117 study theses were stimulated by the research program of the SFB 401 and ?nished before 2010. The authors of this issue of NNFM acknowledge the valuable support fromall guestscientists and everybodyscienti?callyinvolvedin the SFB 401.

Inhalt
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.