Unsteady fronts in the spin-down of a fluid-filled torus

C. del Pino*, R. E. Hewitt, R. J. Clarke, T. Mullin, J. P. Denier

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)
19 Downloads (Pure)


We report the results of an experimental investigation into fluid motion induced by the deceleration to rest of a rigidly rotating fluid-filled torus. Transition to a transient turbulent state is found where the onset of the complicated motion is triggered by a small-scale wavelike instability. The wave forms on a front that propagates from the inner wall of the toroidal container after it is stopped. We reveal the origins of the front through a combination of careful experimental measurements, boundary-layer analysis, and computation of the axisymmetric Navier-Stokes equations.

Original languageEnglish
Article number124104
Pages (from-to)1-5
Number of pages5
JournalPhysics of Fluids
Issue number12
Publication statusPublished - 2008
Externally publishedYes


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