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Publications
Liu, DP., Ai, S.M., Sun, L.P. and Guedes Soares, C. (2024), Vortex-induced vibrations of a steel catenary riser subject to flows with different incident angles, International Journal of Mechanical Sciences, Vol. 269, 109086.
A prediction model is presented to investigate the vortex-induced vibrations (VIV) of offshore steel catenary risers (SCR) considering various flow incident angles. The dynamics of the flexible cylinder are first described using the Euler-Bernoulli beam theory with the absolute nodal coordinate formulation (ANCF). Subsequently, a van der Pol wake oscillator is derived based on the discrete point vortex theory, accounting for the nonlinear coupling between the fluctuating VIV forces in the cross-flow (CF) and in-line (IL) directions and the structural responses. To validate the accuracy of the model, comparisons with experimental results of flexible curved cylinders considering different incoming flow directions are performed. It is demonstrated that the model can capture the multimodal pattern of the curved cylinders and an excellent agreement is observed in the response amplitude, frequency, and excitation modes in both the CF and IL directions with those of experimental results. The VIV response of a real-scale riser is then explored parametrically by varying the incoming flow velocity for incident angles of 0º, 30º, 60º, and 90º. The effects of incident angle on the structural multidirectional response, spatially varying dominant frequency, frequency lock-in position, trajectory, phase, and fluid-structure energy transfer are highlighted. Overall, the proposed numerical model serves as an effective VIV analysis tool that integrates the incident angle with the structural curvature, enabling accurate prediction of the structural dynamic behavior, fatigue life under different environmental conditions.
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