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Vortex stretching in a laminar boundary layer flow

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Abstract

 A new technique to produce controlled stretched vortices is presented. The initial vorticity comes from a laminar boundary layer flow and the stretching is parallel to the initial vorticity. This low velocity flow enables direct observations of the formation and destabilization of vortices. Visualizations are combined with quasi-instantaneous measurements of a full velocity profile obtained with an ultra-sonic pulsed Doppler velocimeter. Several modes of destabilization are observed and include pairing of two vortices, hairpin deformation, and vortex breakdown into a coil shape.

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Authors and Affiliations

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

    P. Petitjeans & J. E. Wesfreid

  2. Lot Oriel, 9 avenue de Laponie, F-91951 Les Ulis Cedex, France, , , , , , FR

    J. C. Attiach

Authors
  1. P. Petitjeans
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  2. J. E. Wesfreid
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  3. J. C. Attiach
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Received: 3 April 1996/ Accepted: 4 October 1996

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Petitjeans, P., Wesfreid, J. & Attiach, J. Vortex stretching in a laminar boundary layer flow. Experiments in Fluids 22, 351–353 (1997). https://doi.org/10.1007/s003480050059

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  • DOI: https://doi.org/10.1007/s003480050059

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