IUTAM Symposium Transsonicum IV

Kurzfassung

In the first group, work is devoted to inviscid steady and unsteady flow and toward their use in aeroelastic applications. With theories and models available from work reported in the past symposia, work remains to be done mainly for unsteady flow, even without the influence of flow viscosity. Local configurations of sonic locus, shock waves and flow boundaries have been subject to various mathematical approaches, work in this subject remains important also for passing the analytical knowledge base on to the younger generation of aerospace engineers. The second group of contributions is devoted to viscous flows. Fluid flow with viscosity adds phenomena which prohibit analytical treatment in many cases. Viscous-inviscid flow interaction in aerospace and in turbomachinery applications need a refined treatment of local interactions between shocks and boundary layers. A report about the European Transonic Windtunnel is presented as a mature experimental test facility for the aircraft industry to model realistic flight Reynolds numbers. With tremendous success in Computational Fluid Mechanics, this meeting was not intended to report about the status of Computational Fluid Dynamics (CFD). In the third group only a few innovative contributions follow a comprehensive review about the development of transonic CFD through the past four decades. Design rather than analysis seems to be a task requiring a systematic use of the transonic knowledge base. Reporting the status of practical design optimization in the industry is complemented by outlining novel strategies to arrive at optimization with affordable computer time. Applying optimization to the hardware of aircraft wings and helicopter rotors results in the development of flow control techniques which partly are brought to reality by an adaptation of shape components through mechanical devices: Progress in this field is reported by a fourth group of contributions. Renewed interest in supersonic civil transport (SST) resulted in a few research projects during the past decade. Inevitably an SST will have to pass the sonic flow regime which is still seen as an issue for both economical operation as well as for ecological problems stemming from the sonic boom. These problems are of a transonic nature, recent progress is being reported in the fifth group. Finally, in a small sixth group we present some results for real gas effects like dissociation and condensation. These will be useful for introduction into the operational methods dealing with ideal gas models.