Vortex-induced vibrations of elastically mounted circular cylinder at Re of the O(105)

In the field of fluid structure interaction and offshore engineering, vortex induced vibrations (VIV) have been a highly researched topic over a last few decades. There is a continuous need to understand the magnitude of peak oscillations and force-phase relationship, possible under all forcing conditions. Considering this fact, and bearing in mind that in practical situations, cylindrical structures are subjected to water currents corresponding to high Re. Present study is focused on the VIV in regimes of high Re beyond 10(5). Measurements were made in a towing tank facility, for mass ratio m* = 0.87-2.52; damping ratio zeta = 0.058-0.066; and m*zeta = 0.05 -0.166. Displacement measurements together with force coefficients in the transverse direction and the phase relationship between force and displacement were also investigated. An attempt has been made to capture hysteresis as part of the main objective of the study. The present investigation sheds new light in the VIV response of the cylinder in terms of its dependence on reduced velocity (U-r) and hysteretic response. There is a need to include the effects of high Re in predictive relationships for maximum amplitude response (Y-max). A new equation is proposed for Y-max including the effects of alpha = [(m* + C-A)zeta] and Re which appears to be better than the only other available approach in the literature. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.