Torsional characteristics of steep wave riser under different current loads based on co-rotational coordinate method

• Published in: Ocean engineering Vol. 310; p. 118716
• Main Authors: Li, Zhong, Gu, Jijun, Guo, Hua, Jia, Jichuan, Wang, Shujiang, Huang, Chen
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.10.2024
• Subjects: Co-rotational coordinate method; External current; Steep wave riser; Torsional characteristics; Co-rotational coordinate method; Torsional characteristics; External current; Steep wave riser
• ISSN: 0029-8018
• DOI: 10.1016/j.oceaneng.2024.118716

In this paper, the three-dimensional torsional characteristics of the deep-water steep wave riser (SWR) under different types of external current loads are studied. The finite element model of SWR is established based on co-rotational coordinate method and then solved by Newton-Raphson technique. The accuracy of the SWR co-rotational model is verified by Abaqus software. The influence of three types of external currents, including unidirectional uniform current, unidirectional shear current and bidirectional shear current caused by internal solitary waves on the torsional characteristics of SWR are studied. In particular, the variation trend of the three-dimensional spatial configuration, tension extreme value and torque extreme value of SWR under the action of external currents with different velocities and directions is analyzed. The results indicate that the co-rotational model can effectively simulate the torsional behavior of SWR, thereby proving the feasibility and flexibility of the co-rotation coordinate method in dealing with the torsional problems of marine structures with large slenderness ratio under different external current conditions. •Deep-water SWR's 3D torsional characteristics under varied external currents are studied.•The finite element model of SWR is established based on co-rotational coordinate method.•The influence of unidirectional uniform, shear, & bidirectional shear currents on SWR torsional properties are analyzed.