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Fluid–structure interaction-induced oscillation of flexible structures in laminar and turbulent flows

Published online by Cambridge University Press:  09 January 2013

Jorge Pereira Gomes  and
H. Lienhart
Jorge Pereira Gomes*
Affiliation:
Institute of Fluid Mechanics and Erlangen Graduate School in Advanced Optical Technologies, University of Erlangen-Nuremberg, Cauerstrasse 4, D-91058 Erlangen, Germany
H. Lienhart
Affiliation:
Institute of Fluid Mechanics and Erlangen Graduate School in Advanced Optical Technologies, University of Erlangen-Nuremberg, Cauerstrasse 4, D-91058 Erlangen, Germany
*
†Email address for correspondence: jgomes@lstm.uni-erlangen.de
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Abstract

Self-excitation of the motion of a structure has become a prominent aspect of engineering projects over recent years as designers are using materials at their limits, causing structures to become progressively lighter, more flexible and, therefore, prone to vibrate. Stimulated by the increasing interest in fluid–structure interaction (FSI) problems, this study investigated the instability and consequent FSI-induced self-excited oscillation of flexible structures in uniform flows at Reynolds numbers between $10$ and $1. 69\times 1{0}^{5} $. The investigations were performed in both water and a highly viscous syrup ($\nu = 1. 64\times 1{0}^{- 4} ~{\mathrm{m} }^{2} ~{\mathrm{s} }^{- 1} $) and considered three structures of different geometries. The results were conclusive in showing that the motion of the structure was characterized by a sequence of oscillation modes as a function of the characteristics of the structure and flow properties. In addition, it was possible to identify the self-excitation mechanisms as being of the instability-induced excitation (IIE) or movement-induced excitation (MIE) types. IIE was observed to be the most dominant mechanism of excitation at lower velocities and it was defined by a direct relation between the flow fluctuation and natural frequencies of the structure. For that reason, IIE was strongly determined by the geometry of the front body of the structure. At higher velocities, the amplitudes of the flow disturbances generated by the structure movement increased and excitations of the MIE type became predominant for all structures. The MIE mechanism was found to be weakly influenced by the shape of the structure but very sensitive to its dynamic characteristics and to the properties of the fluid, especially the Reynolds number.

JFM classification

Aerodynamics: Aerodynamics Vortex Flows: Vortex instability

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 715 , 25 January 2013 , pp. 537 - 572
Copyright
©2013 Cambridge University Press

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