The flow-induced instability of long hanging pipes

Abstract : The effect of increasing length on the stability of a hanging fluid-conveying pipe is investigated. Experiments show that there exists a critical length above which the flow velocity necessary to cause flutter becomes independent of the pipe length. The fluid-structure interaction is thus modelled by following the work of Bourrières and of Païdoussis. Computations using a standard Galerkin method confirm this evolution. A short pipe model is then considered, where gravity plays a negligible role. Transition between this short length model and the asymptotic situation is found to occur where a local stability criterion is satisfied at the upstream end of the pipe. For longer pipes, a model is proposed where the zone of stable waves is totally disregarded. Comparison of these models with experiments and computations show a good agreement over all ranges of mass ratios between the flowing fluid and the pipe. © 2002 Éditions scientifiques et médicales Elsevier SAS. All rights reserved.
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Olivier Doaré, Emmanuel de Langre. The flow-induced instability of long hanging pipes. European Journal of Mechanics - A/Solids, Elsevier, 2002, 21 (5), pp.857-867. ⟨10.1016/s0997-7538(02)01221-4⟩. ⟨hal-01024916⟩

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