L-transition from right- to left-handed helical vortices
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.
KeywordsVortex Ring Vortex Line Vortex Tube Swirl Flow Vortex Breakdown
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Alekseenko, S.V., Kuibin, P.A., Okulov, V.L., & Shtork, S.I.
1999 Helical vortices in swirl flow. J. Fluid Mech.382
, 195–243.CrossRefMathSciNetADSzbMATHGoogle Scholar
Brøns, M., Voigt, L. K. & Sørensen, J. N.
1999 Streamline topology of steady axisymmetric vortex breakdown in a cylinder with co-and counter-rotating end-covers. J. Fluid Mech.401
, 275–292.MathSciNetADSCrossRefGoogle Scholar
1991 Numerical simulation of axisymmetric vortex breakdown in a closed cylinder. Lectures in Applied Mathematics28
, 131–152.MathSciNetzbMATHGoogle Scholar
1988 Vortex breakdown: observations and explanations. Prog. Aerosp. Sci.
, 189–229.CrossRefGoogle Scholar
1978 The structure of vortex breakdown. Ann. Rev. of Fluid Mech.
, 221–246.ADSCrossRefGoogle Scholar
1996 Transition from the right spiral symmetry to the left spiral symmetry during vortex destruction. Tech. Phys. Lett.
, 47–54.Google Scholar
1992 Vortex dynamics. Cambridge Univ. Press
Sotiropoulos, F. & Ventikos, Y.
2001 The three-dimensional structure of confined swirling flows with vortex breakdown. J. Fluid Mech.
, 155–175.CrossRefMathSciNetADSzbMATHGoogle Scholar
Sørensen J.N. & Loc, T.P.
1989 High-order axisymmetric Navier-Stokes code: Description and evaluation of boundary conditions. Int. J. Numer. Math. in Fluids.
, vol. 9
, 1517–1537.CrossRefGoogle Scholar
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