Reconfiguration and oscillations of a vertical, cantilevered-sheet subject to vortex-shedding
Abstract
The dynamics of a thin low-density polyethylene sheet subject to periodic forcing due to B\'enard-K\`arm\`an vortices in a long narrow water channel is investigated here. In particular, the time-averaged sheet deflection and its oscillation amplitude are considered. The former is first illustrated to be well-approximated by the static equilibrium between the buoyancy force, the elastic restoring force, and the profile drag based on the depth-averaged water speed. Our observations also indicate that the presence of upstream vortices hinder the overall reconfiguration effect, well-known in an otherwise steady flow. For the sheet tip oscillations, a simple model based on torsional-spring-mounted flat plate correctly captures the measured tip amplitude over a wide range of sheet physical properties and flow conditions. Furthermore, a rich phenomenology of structural dynamics including vortex-forced-vibration, lock-in with the sheet natural frequency, flow-induced vibration due to the sheet wake, multiple-frequency and modal response is reported.
Keywords
Cite
@article{arxiv.2210.04335,
title = {Reconfiguration and oscillations of a vertical, cantilevered-sheet subject to vortex-shedding},
author = {J. John Soundar Jerome and Yohann Bachelier and Delphine Doppler and Christophe Lehmann and Nicolas Rivière},
journal= {arXiv preprint arXiv:2210.04335},
year = {2023}
}
Comments
Editorial acceptance for publication in Physical Review Fluids on the 14th of July 2023