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Fluid-Structure Interaction Exciting Mechanisms of Flexible Structures in Uniform Flows

[+] Author Affiliations
Jorge Pereira Gomes, Hermann Lienhart

University of Erlangen-Nuremberg, Erlangen, Germany

Paper No. FEDSM-ICNMM2010-30948, pp. 203-212; 10 pages
doi:10.1115/FEDSM-ICNMM2010-30948
From:
  • ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels
  • ASME 2010 7th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibration and Noise: Volume 3, Parts A and B
  • Montreal, Quebec, Canada, August 1–5, 2010
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-5451-8 | eISBN: 978-0-7918-3880-8
  • Copyright © 2010 by ASME

abstract

The oscillation of a structure immersed on a flow can become self-excited as a result of different fluid-structure interaction mechanisms. To identify the self-exciting mechanisms and to understand the influence of the physical parameters on the different exciting processes, the two-dimensional free swivelling movement of flexible structure models were investigated in both laminar and turbulent uniform flows. The coupled fluid and structure movement was characterized using a particle image velocimetry (PIV) system complemented by a time-phase detector to obtain accurate time-phase resolved measurements of the flow velocity field and structure deformation. The experimental tests proved that the self-exciting mechanisms are strongly dependent on the approaching flow velocity. For the velocity range tested, a sequence of clearly defined movement-induced excitation (MIE) and instability-induced excitation (IIE) of the model was observed on increasing the velocity of the incoming flow. In this contribution, the results for one specific structure configuration are presented.

Copyright © 2010 by ASME

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