Download New Results in Numerical and Experimental Fluid Mechanics by B. Anil Mertol (auth.), Prof. Dr. Cameron Tropea, Dr. Suad PDF

By B. Anil Mertol (auth.), Prof. Dr. Cameron Tropea, Dr. Suad Jakirlic, Dr. Hans-Joachim Heinemann, Prof. Rolf Henke, Prof. Dr. Heinz Hönlinger (eds.)

This quantity includes the contributions to the 15. Symposium of the STAB (German Aero-space Aerodynamics Association). during this organization all these German scientists and engineers from universities, study institutions and are concerned, who're doing examine and undertaking paintings in numerical and experimental fluid mechanics and aerodynamics, ordinarily for aerospace yet for different purposes, too. the various contributions are offering effects from nationwide and ecu neighborhood subsidized initiatives. the amount offers a wide evaluate over the continuing paintings during this box in Germany, with the themes being high-aspect ratio wings, low aspect-ratio wings, bluff our bodies, laminar movement keep watch over and transition, lively movement keep watch over, hypersonic flows, aeroelasticity, aeroacoustics, mathematical basics/ numerical simulation, actual basics, and facilities.

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Extra info for New Results in Numerical and Experimental Fluid Mechanics VI: Contributions to the 15th STAB/DGLR Symposium Darmstadt, Germany, 2006

Example text

2. Model mounted in the test section The subsonic wind tunnel MUB is a conventional closed-circuit atmospheric tunnel with exchangable test sections. 3 m squared closed test section for velocities up to 60 m/s was used. The model is mounted in the test section using turntables at the side walls as illustrated in Figure 2. By this way sting-induced interferences on the flow in the rear fuselage and tailplane region could be avoided. 72×106. Natural transition was allowed at all components of the model.

Acknowledgments The support of this research by the Deutsche Forschungsgemeinschaft (DFG) in the frame of SFB 401 is gratefully acknowledged. : A large-eddy simulation method for low Mach number flows using preconditioning and multigrid. Comput. : Instability and transient growth for two trailing-vortex pairs. J. Fluid Mech. : Stability theory for a pair of trailing vortices. AIAA J. : Stability of a four-vortex aircraft wake model. Phys. : Large-eddy simulations of film cooling flows. Comput. : Two-dimensional wake vortex physics in the stably stratified atmosphere.

As discussed in [6, 7] the influence of the boundaries is negligible small when the distance of the vortices is small compared to the distance between a vortex core and the boundary. Details of the meshes are given in the section 3. 3 Results Three different simulations were performed to evidence the impact of long and short-wave instabilities on the decay of vorticity in vortex systems. In the first analysis the short-wave co-operative elliptical instability (Case I) is considered. Then, the Crow instability (Case II) is computed and finally, a four-vortex system (Case III) is analyzed.

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