Abstract
Abstract According to Hamilton’s principle and conservation law of mass and momentum, governing equations of fluid-structure interaction and structural dynamics of a flexible riser transporting high-speed spiral flow are developed for vortex-induced vibration (VIV) analysis for lifting pipe system in deep-sea mining. The bi-directional fluid-solid interaction between flexible riser and internal and external flows is achieved by data mapping and exchange among the flow field domain and the solid domain. where the radial basis function method is used for moving interpolation of the flow field grid boundaries and internal nodes. The governing equations are then discretized and solved by the finite element method. Based on the computational fluid dynamics (CFD) method, a three-dimensional flexible riser fluid-structure coupling numerical model is established, and the numerical accuracy of the model is verified. Furthermore, dynamic characteristics of VIV of the flexible riser transporting spiral flow are investigated and the effects of internal flow velocity of the spiral flow on VIV responses are evaluated. The results show that the variation of modal vibration pattern of the flexible riser under the combined excitation of internal and external flows is evident, and the flow velocity of internal flow have significant nonlinear effects on the inherent frequency and vibration deformation of the flexible riser.
Published Version
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