Simultaneous CFD evaluation of VIV suppression using smaller control cylinders. (August 2015)

• Record Type: Journal Article
• Authors: Zhu, Hongjun; Yao, Jie; Ma, Yue; Zhao, Hongnan; Tang, Youbo
• Is Part Of: Journal of fluids and structures. Volume 57(2015:Aug.)
• Page Start: 66
• Page End: 80
• Publication Date: 2015-08
• Subjects: VIV suppression -- Control cylinder -- Vortex shedding -- FSI -- CFD; Fluid-structure interaction -- Periodicals; Fluid mechanics -- Periodicals; Structural dynamics -- Periodicals; Structural analysis (Engineering) -- Periodicals; 620.106
• DOI: 10.1016/j.jfluidstructs.2015.05.011
• Languages: English
• ISSNs: 0889-9746

Abstract

Abstract: Two-degree-of-freedom vortex-induced vibrations (VIV) of a circular cylinder with and without two smaller control cylinders are investigated numerically by computational fluid dynamics (CFD) models coupling with a fluid–structure interaction (FSI) computational method. The numerical model is validated against experimental data of VIV of an isolated cylinder in uniform current. The study is aimed to investigate the effect of smaller control cylinders on VIV suppression. The trajectories of cylinder motion, amplitude response, and temporal evolution of vortex shedding and streamlines are obtained by conducting a series of simulations. And the effect of Reynolds number, located angle and rotational rate of small control cylinders are discussed in detail. It is found that placing small cylinders at 45° to the downstream vector can achieve a good suppression effect, but the effect is different at different Re. Rotating control cylinders with a reasonable rotation velocity can further enhance the VIV suppression by injecting enough momentum into the boundary layer of the main cylinder. The best effect is found at U c =10, which has a 64.56% reduction in the transverse vibration response. Graphical abstract: Highlights: A CFD model coupling with a FSI method is used to evaluate VIV suppression. Placing small rods at 45° to the downstream vector can achieve a good suppression. Rotating control cylinders with U c =10 can further enhance VIV suppression.