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Platform surge effects on vortex-induced vibrations of catenary cables subject to nonlinear shear flow
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DOI：10.1016/j.jfluidstructs.2026.104600.png)
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Abstract
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This study investigates the vortex–induced vibration (VIV) of a catenary dynamic cable subjected to the combined effects of platform surge motion and nonlinear shear current, employing a bidirectional fluid–structure interaction framework. Simulations are conducted over Reynolds numbers from 2000 to 12,000. The results indicate that the platform surge motion significantly amplifies multifrequency characteristics in cross-flow responses and governs the frequency-locking behavior in vertical and in-line vibrations. Increasing flow velocity drives a transition of dominant modes toward higher orders, with spatiotemporal patterns evolving from standing to traveling waves. Vibration responses exhibit significant spatial heterogeneity: cross-flow responses at mid-span involve competing dominant frequencies, whereas vertical responses are substantially larger in the lower region compared to the upper region. Furthermore, the synergistic interaction of platform surge motion and nonlinear shear flow excites highly nonlinear dynamic behavior. Phase-plane trajectories and Poincaré maps reveal that the system evolves from quasi-periodic responses at low velocities to chaotic states at higher velocities or under surge motion–shear flow coupling. Instantaneous vorticity analysis reveals that stronger inflow intensifies vortex interactions and wake instability, while platform motion further amplifies three-dimensional vortex distortion along the catenary cable. These findings provide new insights into the dynamic behavior and fatigue-critical mechanisms of dynamic cables in floating offshore wind systems.
Keywords:
vortex-induced vibration
catenary cable
platform surge motion
nonlinear shear flow
fluid-structure interaction
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