Catenary riser sliding and rolling on seabed during induced lateral movement |
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| Institution: | 1. Department of Structural and Geotechnical Engineering, Polytechnic School at University of São Paulo, São Paulo, SP, Brazil;2. Department of Naval Arch. and Ocean Engineering, Polytechnic School at University of São Paulo, São Paulo, SP, Brazil;1. State Key Lab of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China;2. Vessel Performance Product, ABS Corporate APM, Huston, USA;1. Department of Mechanics and Engineering Science, Fudan University, Shanghai, China;2. Offshore Oil & Gas Research Center, China University of Petroleum, Beijing, China;1. National University of Singapore, Department of Civil and Environmental Engineering, 1 Engineering Drive 2, Singapore 117576, Singapore;2. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China;1. Department of Aerospace and Mechanical Engineering, Carleton University, Ottawa, Canada;2. Joining and Welding Research Institute, Osaka University, Osaka, Japan |
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| Abstract: | Catenary risers have an interaction zone with the seabed, usually referenced as flowline. Movements in this region can be induced by sea currents and large offsets in floating unit, leading to touchdown position changes and affecting internal loads along riser length. In this work the contact flowline-seabed is modeled including sliding and rolling friction. Case studies involving large offsets in floating unit and lateral sea currents are solved to better understand the consequences of possible rolling and large sliding. The riser is modeled using a geometrically-exact finite element beam model. The contact is addressed with a new technique to include rotation movements from underlying beam models. This leads to global riser models including complex kinematics, being able to represent scenarios with alternating sliding/rolling and its consequences on internal loads of riser structure. A parametric study is performed to measure the influence of the friction coefficient in tension and torsion along typical flexible pipe and steel pipe catenary risers. |
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| Keywords: | Catenary Risers Contact Friction Finite element method |
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