Vortex-induced vibrations of a cantilevered blunt plate: POD of TR-PIV measurements and structural modal analysis - Laboratoire de mécanique des structures et des systèmes couplés Access content directly
Journal Articles Journal of Fluids and Structures Year : 2023

Vortex-induced vibrations of a cantilevered blunt plate: POD of TR-PIV measurements and structural modal analysis

Abstract

Vortex induced vibrations sustained by immersed bodies may induce early structural fatigue and acoustic noise radiation. The present study consists in an experimental characterization of the vortex shedding and induced vibrations of a cantilevered blunt rectangular aluminium plate of chord to thickness ratio 16.7, immersed in a uniform water flow in the hydrodynamic tunnel of the French Naval Academy Research Institute. Experiences have been conducted at zero degrees incidence for Reynolds numbers Re c (based on chord length) ranging from 2.5 × 10 5 to 9.5 × 10 5 , leading to turbulent wake conditions. The hydrodynamic properties of the wake have been evaluated by statistical analysis, Proper Orthogonal Decomposition and vortex core identification of Time Resolved Particle Image Velocimetry fields. The structural response of the plate has been examined by laser vibrometry through modal analysis. The fluid-structure interactions have been examined for three different vibration regimes: out of resonance, lock-off resonance with the 1 st twisting mode and lock-in resonance. In the out of resonance regime, the strength of the Karman vortices is preferentially controlled by the Strouhal number. At the lock-in, it has been observed that there is an energy transfer in the wake from low order energetic modes to high order energetic modes. In particular,the flapping of the separated shear layer at the lock-in is responsible for an enhancement of the contributions to the total kinetic energy of both the wake bubble's instability and the Karman vortices. The flapping seems to be also responsible for the occurrence of the resonance at a reduced velocity, smaller than the reduced velocity of the lock-in.
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Dates and versions

hal-04001650 , version 1 (23-02-2023)

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Yann Watine, Céline Gabillet, Boris Lossouarn, Jean-François Deü, Jacques-André Astolfi. Vortex-induced vibrations of a cantilevered blunt plate: POD of TR-PIV measurements and structural modal analysis. Journal of Fluids and Structures, 2023, 117, pp.103832. ⟨10.1016/j.jfluidstructs.2022.103832⟩. ⟨hal-04001650⟩
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