Récupération d'énergie et vibrations induites par vortex de structures flexibles

Abstract : Vortex-induced vibrations (VIV) are self-sustained oscillations of an immersed body strongly interacting with its fluctuating wake. These oscillations may reach significant amplitudes when the vortex shedding frequency is close to one of the solid's natural frequencies. VIV consequently appear as an interesting fluid/structure interaction mechanism for energy harvesting. They are here studied both numerically, using a wake-oscillator model, and experimentally. We first prove that it is actually possible to effectively extract energy out of a flow thanks to the VIV of flexible structures, such as cables. We also prove that the structure's flexibility allows it to adapt its dynamics to the fluctuating forcing of the wake, leading to efficient energy harvesting, thanks to (i) the successive excitations of its different vibrations modes, in the case of a tensioned cable with periodically-distributed energy harvesters, chapter 2, or (ii) the development of traveling vortex-induced waves that can transport energy when a hanging cable with a top harvester is considered, chapter 3.
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Contributor : Clément Grouthier <>
Submitted on : Tuesday, October 22, 2013 - 4:36:27 PM
Last modification on : Wednesday, March 27, 2019 - 4:39:25 PM
Long-term archiving on: Thursday, January 23, 2014 - 4:28:10 AM

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Clément Grouthier. Récupération d'énergie et vibrations induites par vortex de structures flexibles. Mécanique des fluides [physics.class-ph]. Ecole Polytechnique X, 2013. Français. ⟨pastel-00875763⟩

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