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On a swept vertical tailplane with infinite span tangential blowing over the shoulder of a deflected rudder is applied. For large rudder deflection angles the flow on the rudder is separated without blowing. A numerical study is conducted with the aim to increase the side force coefficient. This could for example be required during takeoff if the engine on one side fails, necessitating the compensation of a large yawing moment. If this criterion is critical for the sizing of the vertical tailplane, active flow control like tangential blowing could help to reduce the size of the vertical tailplane and thus save weight and fuel. With a continuous slot it is demonstrated that the separation on the rudder can be reduced or avoided. It is shown that by using discrete slots this can be achieved with a smaller momentum coefficient. To analyze the effects of the discrete slots and their jets on each other and their effectivity with regard to the gain in side force coefficient a parameter study is conducted. The number of slots as well as the size of the slots in spanwise direction is varied and the impact of jet velocity changes is also studied. In comparing the results for a constant increase in side force and constant slot size in spanwise direction the configuration with the smaller number of slots but a higher jet velocity proved to be the most effective one.

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Arbeitsgemeinschaft) founded towards the end of the 1970s, whereas DGLR is the German Society for Aeronautics and Astronautics (Deutsche Gesellschaft für Luftund Raumfahrt-Lilienthal Oberth e.V.). The mission of STAB is to foster aerodynamics research and its appreciation in Germany. This is accomplished by creating vivid forums for scientific discussions and by disseminating most recent research results, thereby enhancing scientific progress and avoiding unnecessary duplication in research work. Particularly today, this is more crucial than ever. Thanks to the experience and methodologies gained in the past, it is now easier to obtain new knowledge for solving today's and tomorrow's problems. STAB unites German scientists and engineers from universities, research establishments and the industry, involved in research and project work in the field of numerical and experimental fluid mechanics and aerodynamics for aerospace, ground transportation and other applications. This is a solid basis for numerous common research activities sponsored by different funding agencies. Since 1986, the symposium has taken place at different locations in Germany every two years. In between, STAB workshops have been held regularly at the DLR in Göttingen. The various symposia locations across Germany represent focal points in Germany's Aerospace Fluid Mechanics Community. The STAB symposia and workshops provide excellent forums where new research activities can be presented, often resulting in new jointly organized research and technology projects. It is the eleventh time that the contributions to the symposium are published after being subjected to a peer review. The present contributions highlight the current key area of integrated research and development based on the fruitful collaboration of industry, research establishments and universities. The research areas include v airplane and ground vehicle aerodynamics, multidisciplinary optimization and new configurations, turbulence research and modelling, laminar flow control and transition, rotorcraft aerodynamics, aeroelasticity and structural dynamics, numerical and experimental simulation including test techniques, aeroacoustics as well as biomedical and convective flows. From some 77 lectures presented at the symposium, 67 are included in this book. The review board, partly identical with the programme committee, consisted of: K