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Effect of Mass Ratio on the Vortex-Induced Vibrations of a Long Tensioned Beam in Shear Flow

Author(s)
Lucor, Didier; Bourguet, Remi; Triantafyllou, Michael S
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Abstract
The flow past a cylindrical tensioned beam of aspect ratio 200 is predicted by direct numerical simulation of the threedimensional Navier-Stokes equations. The beam is free to oscillate in inline and crossflow directions and submitted to a linearly sheared oncoming flow. The ratio between high and low inflow velocities is 3.67, with a maximum Reynolds number of 330. Two structure/fluid mass ratios are considered, 6 and 3. Structure vortex-induced vibrations are characterized by mixed standingtraveling wave patterns. A reduction of mass ratio from 6 to 3 leads to purer, more pronounced traveling wave responses and larger amplitude vibrations in both directions. While multifrequency structure vibrations are observed at m = 6, case m = 3 exhibits monofrequency responses. A large zone of synchronization between vortex shedding and structure vibration (lock-in) is identified in the high velocity region. The topology of fluidstructure energy exchanges shows that the flow can excite the structure at lock-in and damps its vibrations in non-lock-in region. Inline/crossflow motion synchronization is monitored. Similar zigzagging patterns of inline/crossflow motion phase difference are put forward for both mass ratios, highlighting a predominant character of counterclockwise orbits in the excitation region. Topics: Shear flow, Vortex-induced vibration
Date issued
2010-08
URI
http://hdl.handle.net/1721.1/120742
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
ASME 2010 7th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibration and Noise: Volume 3, Parts A and B
Publisher
ASME International
Citation
Bourguet, Rémi, Didier Lucor, and Michael S. Triantafyllou. “Effect of Mass Ratio on the Vortex-Induced Vibrations of a Long Tensioned Beam in Shear Flow.” ASME 2010 7th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibration and Noise, 1-5 August, 2010, Montreal, Quebec, Canada, ASME, 2010. © 2010 ASME
Version: Final published version
ISBN
978-0-7918-5451-8

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