Experimental and computational investigation of interactive flow induced oscillations of two tandem rough cylinders at 3 x104≤Re≤1.2x105

OCEAN ENGINEERING

卷:223

Article

Ding, Wenjun^1,2  Sun, Hai^2,3  Xu, Wanhai^2,4  Bernitsas, Michael M.² 

[1] Northwestern Polytech Univ, Unmanned Syst Res Inst, Xian 710072, Peoples R China

[2] Univ Michigan, Dept NA&ME, Marine Renewable Energy Lab, Ann Arbor, MI 48109 USA

[3] Harbin Engn Univ, Coll Aerosp & Civil Engn, Harbin 150001, Peoples R China

[4] Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300072, Peoples R China

关键词: Flow induced oscillation (FIO);    Vortex induced vibration (VIV);    Galloping;    Wake pattern;    Tandem cylinders;    Passive turbulence control;   

DOI  :  10.1016/j.oceaneng.2021.108641

来源: Elsevier

【 摘 要 】

The interactive flow induced oscillations (FIO) of two adjacent, elastically mounted, rigid, tandem, locally-rough cylinders in transverse flow direction are analyzed utilizing two-dimensional Unsteady Reynolds-Averaged Navier-Stokes (2-D URANS) equations and verified experimentally in the proximity-wake region. Three sets of experiments and simulations (K = 600N/m, zeta = 0.14; K = 600N/m, zeta = 0.26; K = 1,200N/m, zeta = 0.26; K is spring stiffness, zeta is damping ratio) of two tandem cylinders with turbulence stimulation are tested and simulated for Reynolds number in the range of 30,000 = Re <= 120,000. The reduced velocity range is U* = 2.48-14.22, the mass ratio is m* = 1.343, and the center-to-center in-flow spacing to diameter ratio is d/D = 2.57. The characteristics of amplitude response, frequency response, lift force, and interactive wake patterns are presented and discussed. The trends of the amplitude and frequency responses from numerical simulations are in good agreement with experimental results. The main conclusions of Reynolds number effect on interactive flow induced oscillations are: (1) Five significant flow patterns between two tandem locally-rough cylinders for different Reynolds numbers are observed through analyzing the complex but stable interactions between vortices and cylinders. (2) In the initial and upper VIV branches, the downstream cylinder's FIO is seriously interfered by the wake of the upstream cylinder. (3) The downstream cylinder is strongly impinged by the vortices shed from the upstream cylinder resulting in nearly 180 degrees out-of-phase oscillations in transition from VIV to galloping and in-phase oscillations in galloping.

【 授权许可】

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