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    Critical Mode Switching of Flexible-Cantilever Flutter in Low-Reynolds-Number Channel Flow

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    Authors
    Cisonni, Julien
    Lucey, Anthony
    Elliott, N.
    Date
    2016
    Type
    Conference Paper
    
    Metadata
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    Citation
    Cisonni, J. and Lucey, A. and Elliott, N. 2016. Critical Mode Switching of Flexible-Cantilever Flutter in Low-Reynolds-Number Channel Flow, in Proceedings of the 20th Autralasian Fluid Mechanics Conference (AFMC), paper 482. Dec 5-8 2016. Perth, WA: Australasian Fluid Mechanics Society.
    Source Title
    The Proceedings of the 20th Australasian Fluid Mechanics Conference
    Source Conference
    20th Australasian Fluid Mechanics Conference
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/60072
    Collection
    • Curtin Research Publications
    Abstract

    Inviscid flow modelling has predominantly been employed in the numerous studies on flow-induced flutter instability of flexible cantilevers. This approach has been supported by the prevailing characteristics, giving high Reynolds numbers, of such fluid–structure interaction (FSI) systems in the wide range of engineering applications. By contrast, in this paper, a numerical model coupling a one-dimensional elastic beam model to the Navier–Stokes equations is used to determine the linear flutter-instability characteristics of a slender flexible cantilever immersed in two-dimensional viscous channel flow for laminar flow conditions. The results show that the FSI instability boundaries and the pre- and post-critical cantilever motion can be significantly altered by the non-negligible contribution of viscous effects to the hydrodynamic forces. In general, this model predicts that the FSI system becomes more stable for Reynolds numbers (based on channel height) lower than 100. For cases within this range of very low Reynolds numbers, this study focuses on the particular fluid-to-solid mass ratios at which viscous effects can possibly lead to a change in the critical mode that first becomes unstable.

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