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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Meccanica 29 (1994), S. 343-350 
    ISSN: 1572-9648
    Keywords: Turbulent flows ; Singularities ; Vortex dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Sommario Sono considerate varie questioni correlate con la fisica dei flussi non-viscosi. La nascita di strati di forti vortici è stata ripetutamente osservata nella simulazione delle equazioni tridimensionali, per diverse condizioni iniziali. Nel caso di flussi di Eulero assialsimmetrici, l'origine di questi piani può essere facilmente compresa con l'aiuto di una analogia con i flussi guidati termicamente. Viene inoltre proposto un più generale meccanismo per giustificare questi strati e si passano in rassegna brevemente questioni riguardanti le singolarità. Infine, vengono presentati alcuni risultati preliminari sulla connessione tra i piani formantisi in flussi non viscosi ed i vortici tubolari osservati nei flussi ad alti numeri di Reynolds.
    Notes: Abstract Various questions related to the physics of inviscid flows are reviewed. The emergence of strong vortex sheets has repeatedly been observed in the simulation of the 3-dimensional equations, with a variety of initial conditions. In the case of axisymmetric Euler flows, the origin of these sheets can be easily understood with the help of an analogy with thermally driven flows. A more general mechanism to explain these sheets is proposed. Questions of singularities are briefly reviewed. Lastly, preliminary results on the connection between the sheets forming in inviscid flows, and the vortex tubes observed in high Reynolds number flows are presented.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2016-12-29
    Description: Author(s): Michael P. Brenner, Sahand Hormoz, and Alain Pumir Could velocity fields form infinite gradients in high Reynolds number flows? A proposed iterative mechanism, which involves transformation of vortex tubes to sheets and back to tubes, is analyzed using elementary fluid mechanics. [Phys. Rev. Fluids 1, 084503] Published Wed Dec 28, 2016
    Keywords: Vortex dynamics
    Electronic ISSN: 2469-990X
    Topics: Physics
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