Numerical Simulation of the Vortex-Induced Vibration of A Curved Flexible Riser in Shear Flow

A series of fully three-dimensional (3D) numerical simulations of flow past a free-to-oscillate curved flexible riser in shear flow were conducted at Reynolds number of 185–1015. The numerical results obtained by the two-way fluid–structure interaction (FSI) simulations are in good agreement with th...

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Bibliographic Details
Published in:China ocean engineering 2018-06, Vol.32 (3), p.301-311
Main Authors: Zhu, Hong-jun, Lin, Peng-zhi
Format: Article
Language:English
Subjects:
Amplitude
Coastal Sciences
Columns (structural)
Computational fluid dynamics
Computer simulation
Engineering
Fluid flow
Fluid- and Aerodynamics
Marine & Freshwater Sciences
Numerical and Computational Physics
Oceanography
Offshore Engineering
Phase transitions
Reynolds number
Shear flow
Simulation
Three dimensional flow
Vibration
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Summary:A series of fully three-dimensional (3D) numerical simulations of flow past a free-to-oscillate curved flexible riser in shear flow were conducted at Reynolds number of 185–1015. The numerical results obtained by the two-way fluid–structure interaction (FSI) simulations are in good agreement with the experimental results reported in the earlier study. It is further found that the frequency transition is out of phase not only in the inline (IL) and crossflow (CF) directions but also along the span direction. The mode competition leads to the non-zero nodes of the rootmean- square (RMS) amplitude and the relatively chaotic trajectories. The fluid–structure interaction is to some extent reflected by the transverse velocity of the ambient fluid, which reaches the maximum value when the riser reaches the equilibrium position. Moreover, the local maximum transverse velocities occur at the peak CF amplitudes, and the values are relatively large when the vibration is in the resonance regions. The 3D vortex columns are shed nearly parallel to the axis of the curved flexible riser. As the local Reynolds number increases from 0 at the bottom of the riser to the maximum value at the top, the wake undergoes a transition from a two-dimensional structure to a 3D one. More irregular small-scale vortices appeared at the wake region of the riser, undergoing large amplitude responses.
ISSN:0890-5487
2191-8945
DOI:10.1007/s13344-018-0031-z