L-transition from right- to left-handed helical vortices

  • Valery Okulov
  • Jens N. SØrensen
  • Lars K. Voigt
Conference paper
Part of the Fluid Mechanics and Its Applications book series (FMIA, volume 71)


This study is devoted to analysing changes in the helical symmetry of axial vortex structures. The aim is to provide an improved understanding of the appearance of recirculating bubbles in swirl flows. The bubble generation is usually referred to as vortex breakdown, see e.g. Leibovich 1978 or Escudier 1988. The study concerns a viscous, incompressible, axisymmetric flow in a closed cylinder with co-rotation of the end-covers in the regime where the appearance of the first bubble takes place, see Brøns et al. 1999. For the investigated flow regime only one type of change in helical symmetry, denoted L-transition, was observed. The change of helical symmetry provides a possible explanation for the appearance of bubble structures in the vortex breakdown problem.


Vortex Ring Vortex Line Vortex Tube Swirl Flow Vortex Breakdown 
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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Valery Okulov
    • 1
    • 2
  • Jens N. SØrensen
    • 1
  • Lars K. Voigt
    • 1
  1. 1.Department of Mechanical EngineeringTechnical University of Denmark Nils Koppels AlléLyngbyDenmark
  2. 2.Institute of Thermophysics, SB RASNovosibirskRussia

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