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Effect of length on the instability of hanging pipes

Abstract : The flutter instability of a hanging fluid-conveying pipe is investigated, as its length is increased. 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.
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Olivier Doaré, E. de Langre. Effect of length on the instability of hanging pipes. 5th International Symposium on Fluid Structure Interaction, Aeroelasticity, and Flow Induced Vibration and Noise, Nov 2002, New Orleans, United States. pp.1223-1232, ⟨10.1115/IMECE2002-39018⟩. ⟨hal-01026052⟩



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