Session: FSI-01-01 Thermal Hydraulic Phenomena with Vessels, Piping and Components

Paper Number: 62812

Start Time: Tuesday, July 13, 2021, 09:00 AM

62812 - Influence of Finite-Length Plate Proximity on Vortex-Induced Vibrations of Elastic Cable 

Vortex-induced vibrations (VIV) is a phenomenon of self-exciting oscillations of elastic, or elastically mounted rigid bluff bodies immersed in a fluid flow, which may be observed near chimneys, submarine pipelines, risers, etc. When a structural natural frequency is close to a von Karman street frequency, a resonance phenomenon occurs. The body experiences a periodic force due to vortex shedding and oscillates, mostly in the traversal direction relative to the flow. VIV can lead to fatigue damage accumulation up to the destruction of the structure, but they also can be used to harvest electric energy from the kinetic energy of air or water flow.

In this study, vortex-induced vibrations of elastic cylinder near a finite-length plate is experimentally investigated in aerodynamic tunnel. Rubber cylinder of diameter D = 6 mm was spanned in test section of a wind tunnel near the plate of length nearly 6D. The oscillation amplitude peak for a single cylinder was 0.3D, Reynolds number of the peak-amplitude regime based on cylinder diameter was in the range 180...260. For a cylinder located sufficiently upstream from to the plate trailing edge it was found that oscillation amplitude ratio A/D decreases if the gap ratio G/D between the cylinder surface and the plate reduces. However, for the cylinder location at the same level or downstream from the plate trailing edge, there are regions of essentially larger oscillation amplitude compared to the isolated cylinder case. Maximum amplitude increase by 39% was obtained. Smoke visualizations revealed complex interference of the plate and cylinder wakes.

Presenting Author: Oleg Ivanov Institute of mechanics, Lomonosov Moscow State University

Authors:

Oleg Ivanov Institute of mechanics, Lomonosov Moscow State University
Vasily Vedeneev Institute of mechanics, Lomonosov Moscow State University