It is well established that the onset of spatially periodic vortex states in the Taylor-Couette flow between rotating cylinders occurs at the value of Reynold's number predicted by local bifurcation theory. However, the symmetry breaking induced by the top and bottom plates means that the true situation should be a disconnected pitchfork. Indeed, experiments have shown that the fold on the disconnected branch can occur at more than double the Reynold's number of onset. This leads to an apparent contradiction: why should Taylor vortices set in so sharply at the Reynold's number predicted by the symmetric theory, given such large symmetry-breaking effects caused by the boundary conditions? This paper offers a generic explanation. The details are worked out using a Swift-Hohenberg pattern formation model that shares the same qualitative features as the Taylor-Couette flow. Onset occurs via a wall mode whose exponential tail penetrates further into the bulk of the domain as the driving parameter increases. In a large domain of length L, we show that the wall mode creates significant amplitude in the centre at parameter values that are O(L-2) away from the value of onset in the problem with ideal boundary conditions. We explain this as being due to a Hamiltonian Hopf bifurcation in space, which occurs at the same parameter value as the pitchfork bifurcation of the temporal dynamics. The disconnected anomalous branch remains O(l) away from the onset parameter since it does not arise as a bifurcation from the wall mode
Original languageEnglish
Publication statusUnpublished - 2003

Bibliographical note

Additional information: Later published by Elsevier Science, (2004) Physica D: Nonlinear Phenomena, 191 (3-4), pp. 282-296. ISSN 0167-2789

Sponsorship: AMR is grateful for support from the EPSRC while this work was carried out

Structured keywords

  • Engineering Mathematics Research Group


  • anomalous modes
  • boundary effects
  • Taylor-Couette flow
  • pattern formation


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