Summary
A direct numerical simulation of a three-dimensional free evolving vortex ring has been used to understand some of the features of the vortex ring dynamics. In experiments a persistent wake was observed and by this direct simulation the causes of the wake formation have been clarified. By a kinematic alignment study of vorticity with the eigenvectors of the strain rate tensor, together with vorticity visualisations, explanations on the growth of the “Widnall” instabilities have been obtained. The analysis has shown the presence of two zones, the first characterised by intense vorticity and low strain rate and the second with opposite features. In the former there is the ring core that maintains its coherence in the long term, in the latter there are elongated structures contributing to the deformations of the ring.
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© 1993 Springer Science+Business Media Dordrecht
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Orlandi, P., Verzicco, R. (1993). Identification of Zones in a Free Evolving Vortex Ring. In: Bonnet, J.P., Glauser, M.N. (eds) Eddy Structure Identification in Free Turbulent Shear Flows. Fluid Mechanics and Its Applications, vol 21. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2098-2_35
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DOI: https://doi.org/10.1007/978-94-011-2098-2_35
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