On the wake-induced vibration of tandem circular cylinders: the vortex interaction excitation mechanism

Journal of Fluid Mechanics - Tập 661 - Trang 365-401 - 2010
Gustavo R. S. Assi1, Peter Bearman1, Júlio R. Meneghini2
1Department of Aeronautics, Imperial College, London SW7 2AZ, UK
2Department of Mechanical Engineering, NDF, POLI, University of São Paulo, São Paulo, 05508-900, Brazil

Tóm tắt

The mechanism of wake-induced vibrations (WIV) of a pair of cylinders in a tandem arrangement is investigated by experiments. A typical WIV response is characterized by a build-up of amplitude persisting to high reduced velocities; this is different from a typical vortex-induced vibration (VIV) response, which occurs in a limited resonance range. We suggest that WIV of the downstream cylinder is excited by the unsteady vortex–structure interactions between the body and the upstream wake. Coherent vortices interfering with the downstream cylinder induce fluctuations in the fluid force that are not synchronized with the motion. A favourable phase lag between the displacement and the fluid force guarantees that a positive energy transfer from the flow to the structure sustains the oscillations. If the unsteady vortices are removed from the wake of the upstream body then WIV will not be excited. An experiment performed in a steady shear flow turned out to be central to the understanding of the origin of the fluid forces acting on the downstream cylinder.

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Thông tin xuất bản

Journal of Fluid Mechanics

Tập 661

365-401

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