Flow-Induced Vibration of Four Cantilever Cylinders Arranged in A Square Configuration

Flow-induced vibration (FIV) of four separately mounted cantilever cylinders are experimentally investigated in a water flume. The four cylinders with top ends screwed vertically into a turntable platform are subjected to uniform flows with Reynolds number ranging from 3840 to 16520. A non-intrusive...

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Bibliographic Details
Published in:China ocean engineering 2021-12, Vol.35 (6), p.891-904
Main Authors: Zhu, Hong-jun, Liu, Wen-li, Wang, Jun-lei
Format: Article
Language:English
Subjects:
Cameras
Coastal Sciences
Cross flow
Cylinders
Downstream effects
Engineering
Flow generated vibrations
Fluid flow
Fluid- and Aerodynamics
Flumes
High speed cameras
Interference
Marine & Freshwater Sciences
Nonintrusive measurement
Numerical and Computational Physics
Oceanography
Offshore Engineering
Original Paper
Reynolds number
Simulation
Turntables
Uniform flow
Vibration
Vortex shedding
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Summary:Flow-induced vibration (FIV) of four separately mounted cantilever cylinders are experimentally investigated in a water flume. The four cylinders with top ends screwed vertically into a turntable platform are subjected to uniform flows with Reynolds number ranging from 3840 to 16520. A non-intrusive measurement with high-speed cameras is employed to simultaneously capture the time-varying in-line and cross-flow vibrations in the reduced velocity range of 3.0–12.9. Experimental results highlight the continuous adjustment of flow regime caused by the spatial-temporal alteration of cylinders. Consequently, the space-time varying flow interference contributes to the occurrence of multiple response frequencies. The transition from a dominant frequency to a broad-band response illustrates the enhancement of wake interference. The combination of wake flow interactions results in the irregular oscillation trajectories and the appearance of a response trough with the associated switching in vortex shedding mode. The dual-resonance phenomenon is observed in the four cylinders due to the complicated wake-structure interaction. The greatest mechanical energy possessed by the four cylinders in an in-line square arrangement is mainly resulted from the downstream cylinders, signifying the positive role of wake excitation in extracting hydrokinetic energy from ambient flow.
ISSN:0890-5487
2191-8945
DOI:10.1007/s13344-021-0078-0