On the one hand, it is known from visual observations, Lidar measurements, and numerical simulations that aircraft wake vortices may live significantly longer than anticipated by todays standard regulations of air traffic control. On the other hand, the initially counter-rotating, parallel vortex pair deforms quickly, which reduces the impact time of adverse forces and moments on encountering aircraft. Therefore, Large-Eddy simulations of wake vortex evolution in different meteorological conditions are conducted in order to analyse the physics of vortex deformation. A new post-processing algorithm has been developed that at first determines the three-dimensional path of the vortex core line and then computes piecewise curvature radii as a measure of vortex deformation. It is found that larger turbulence levels and neutral to weakly stable temperature stratification particularly support vortex ring formation. The vortex ring regime is characterised by a reduced descent rate and by a surprising variability of its core radius. It is shown that the varying core size directly affects the evolution of radii-averaged circulation. Comparisons with field experiments indicate good agreement with the considerable life time of the vortex rings and topology.


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    Large-Eddy Simulation of Aircraft Wake Vortex Deformation and Topology


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2011



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Large-eddy simulation of aircraft wake vortex deformation and topology

    Hennemann, I. / Holzäpfel, F. | Tema Archiv | 2011



    Large-eddy simulation of aircraft wake vortex deformation and topology

    Hennemann, I / Holzäpfel, F | SAGE Publications | 2011



    Large-Eddy Simulation of Aircraft Wake Evolution from Roll-Up Until Vortex Decay

    Misaka, Takashi / Holzäpfel, Frank / Gerz, Thomas | AIAA | 2015