Journal
JOURNAL OF FLUID MECHANICS
Volume 549, Issue -, Pages 71-80Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022112005007834
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The spiral form of vortex breakdown observed in the numerical simulations of Ruith et al. (J. Fluid Mech., vol. 486, 2003, p. 331) is interpreted as a nonlinear global mode originating at the convective/absolute instability transition point in the lee of the vortex breakdown bubble. The local absolute frequency at the transition station is shown to yield a satisfactory prediction of the precession frequency measured in the three-dimensional direct numerical simulations.
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