Metastable states of a cylinder wake adjacent to a free surface

J. Sheridan, J. C. Lin, D. Rockwell

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For the same Froude number and depth of submergence beneath a free surface, the wake of a cylinder exhibits two admissible states. The first state involves a jet-like flow generally attached to the free surface; it gives rise to a large-amplitude, quasistationary wave. In the second state, the jet is detached from the free-surface, which exhibits only mild distortion. The critical feature of the transformation between these two states involves the formation of a separated vorticity layer from the free-surface and its interaction with the vorticity layer from the surface of the cylinder. This transformation can occur spontaneously over a time scale much longer than the Kármán period.

Original languageEnglish
Pages (from-to)2099-2101
Number of pages3
JournalPhysics of Fluids
Issue number9
Publication statusPublished - 1 Jan 1995

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