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Vortex stretching and filaments

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Abstract

This paper presents a new technique to produce controlled stretched vortices. Intense elliptical vortices are created by stretching of an initial vorticity sheet. The initial vorticity comes from a laminar boundary layer flow and the stretching is parallel to the vorticity vectors. This low velocity flow enables direct observation of the formation and destabilization of vortices. Visualizations are combined with quasi-instantaneous measurements of a full velocity profile. The velocity profile is obtained with an ultrasonic pulsed Doppler velocimeter. The evolution of the central diameter of the vortices is related to the stretching. It is observed that destabilization occurs by pairing of two vortices, by hairpin deformation, and by breakdown of vortices into a “coil shape”.

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  1. Laboratoire de Physique et Mécanique des Milieux Hétérogènes, URA CNRS 857, Ecole Supérieure de Physique et de Chimie Industrielles (ESPCI), 10, rue Vauquelin, 75005, Paris, France

    Philippe Petitjeans & José-Eduardo Wesfreid

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  1. Philippe Petitjeans
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  2. José-Eduardo Wesfreid
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Petitjeans, P., Wesfreid, JE. Vortex stretching and filaments. Appl. Sci. Res. 57, 279–290 (1996). https://doi.org/10.1007/BF02506064

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  • DOI: https://doi.org/10.1007/BF02506064

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