Computational fluid dynamics and experimental study of lock-in phenomenon in vortex-induced motions of a cell-truss spar |
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Authors: | Ying Wang Jian-min Yang Hai-ning Lü |
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Institution: | State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China |
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Abstract: | Spar platforms could be subject to vortex-induced-motions (VIM) in certain current conditions. Lockin is a phenomenon which
occurs in a range of reduced velocities in VIM. In this paper, a new concept of spar platform called cell-truss spar is studied
using both computational fluid dynamics (CFD) and model test to investigate the VIM of the spar under different reduced velocities.
The unique configuration of the cell-truss spar is carefully considered, and the unsteady flow around the spar is calculated
and visualized in CFD simulations. A physical model with a scale ratio of 1:100 of the cell-truss spar is fabricated, and
model tests are carried out in the current-generating ocean engineering basin. Many important parameters in VIM of the cell-truss
spar are obtained, the occurrence of lock-in phenomenon is successfully simulated, and the mechanism and rules of lock-in
are analyzed. |
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Keywords: | SDar vortex-induced motions (VIM) lock in com gutational fluid dynamics (CFD) model test |
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