Abstract
Vortex-induced vibration (VIV) of marine risers is a typical fluid-structure interaction (FSI) phenomenon. When considering the top-end platform motions, the nonlinearity of risers’ VIV would strengthen significantly, making it become a worthwhile research frontier in ocean engineering. Platform heave leads to the riser’s axial tension fluctuating with time varying (i.e. parametric excitation), while platform surge results in an equivalent unsteady flow field induced by the riser’s forced oscillatory movements. To investigate the VIV response of a full-scale production riser with both platform heave and surge excitations, an alternative time domain numerical analysis procedure is established in this paper. The platform motion response is predicted with the help of three-dimensional potential flow theory, and the riser’s VIV is simulated based on force-decomposition model. By updating the structural stiffness matrix and improving the VIV excitation force formula, the platform heave and surge excitations are taken into account respectively. Four types of cases including steady flow case, heave case, surge case and combined case are calculated to reveal their respective response characteristics as well as the coupling effect between the platform heave and surge excitations. Associated with rainflow counting algorithm and S-N curve method, the stress components of the riser’s VIV under different cases are analyzed, and the structural fatigue damage is evaluated in detail. The obtained conclusions could provide some references to the engineering field at the design stage of marine risers.
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Acknowledgments
This paper is based on the projects supported by the National Natural Science Foundation of China (Grant No. 51579146, 51490674) and Shanghai Rising-Star Program (Grant No. 16QA1402300).
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Yuan, Y., Xue, H., Tang, W., Liu, J. (2021). Fatigue Analysis of Vortex-Induced Vibration for Marine Risers with Top-End Platform Motion Excitations. In: Okada, T., Suzuki, K., Kawamura, Y. (eds) Practical Design of Ships and Other Floating Structures. PRADS 2019. Lecture Notes in Civil Engineering, vol 65. Springer, Singapore. https://doi.org/10.1007/978-981-15-4680-8_44
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DOI: https://doi.org/10.1007/978-981-15-4680-8_44
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