Internal flow-induced instability analysis of catenary risers
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Inclou dades d'ús des de 2022
Cita com:
hdl:2117/330022
Tipus de documentText en actes de congrés
Data publicació2019
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
Offshore production and export risers in deep-water oil and gas applications are highly slender and flexible cylindrical structures subject to complex environmental and operational loading conditions. In particular, catenary risers having variable curvature have been widely considered by industry as a technologically and economically viable solution for deep waters. Nevertheless, the mechanism of dynamic instability of curved bendable pipes transporting flows has not been properly investigated in the literature despite such practical and theoretical importance. In this study, the dynamic response and stability of catenary risers conveying internal flows are investigated by using a linearized finite element-based continuum pipe model. The governing fluid-structure interaction equations are derived using Hamilton’s principle and formatted into a generalized eigenvalue form in order to assess its stability for varying internal flow speeds. This procedure elucidates the contribution of the Centrifugal and Coriolis related terms for the onset of divergence and flutter unstable modes. It is shown that the pipe’s tension to bending rigidity ratio plays a catalytic role in the occurrence and evolution of intermodal coupling of the flutter modes in post-divergence regime. Theories and numerical strategies present in this study are being extended to the multiphase flow-induced vibration applications.
CitacióBakis, K.N.; Srinil, N. Internal flow-induced instability analysis of catenary risers. A: MARINE VIII. "MARINE VIII : proceedings of the VIII International Conference on Computational Methods in Marine Engineering". CIMNE, 2019, p. 525-536. ISBN 978-84-949194-3-5.
ISBN978-84-949194-3-5
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Marine-2019-43_ ... ow-induced instability.pdf | 640,1Kb | Visualitza/Obre |