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Spiral vortex breakdown as a global mode

Abstract : 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. © 2006 Cambridge University Press.
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F. Gallaire, M. Ruith, E. Meiburg, Jean-Marc Chomaz, Patrick Huerre. Spiral vortex breakdown as a global mode. Journal of Fluid Mechanics, Cambridge University Press (CUP), 2006, 549 (february), pp.71-80. ⟨10.1017/s0022112005007834⟩. ⟨hal-01023370⟩



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