Reconfiguration and oscillations of a vertical, cantilevered-sheet subject to vortex-shedding

• Main Authors: Jerome, J. John Soundar, Bachelier, Yohann, Doppler, Delphine, Lehmann, Christophe, Rivière, Nicolas
• Format: Journal Article
• Language: English
• Published: 09.10.2022
• Subjects: Physics - Fluid Dynamics
• DOI: 10.48550/arxiv.2210.04335

The dynamics of a thin low-density polyethylene sheet subject to periodic forcing due to Bénard-Kàrmàn 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.