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Dynamics of offshore risers using a geometrically-exact beam model with hydrodynamic loads and contact with the seabed.pdf
Engineering Structures 125 (2016) 438–454
Contents lists available at ScienceDirect
Engineering Structures
journal homepage: /locate/engstruct
Dynamics of offshore risers using a geometrically-exact beam model with hydrodynamic loads and contact with the seabed
Alfredo Gay Neto
Department of Structural and Geotechnical Engineering, Polytechnic School at University of S?o Paulo, Brazil
article info
Article history: Received 29 November 2015 Revised 7 May 2016 Accepted 5 July 2016 Available online 25 July 2016
Keywords: Riser Hydrodynamics Beam Contact Dynamics
abstract
In the context of challenging scenarios for offshore oil exploitation, robust numerical models are necessary to predict the risers’ mechanical behavior. This work presents a model to simulate offshore risers’ dynamics using the geometrically-exact approach for beams. Expressions are derived for the hydrodynamic loads due to riser-seawater ?ow interaction, adopting the Morison’s equation and considering large displacements and ?nite rotations, including the added mass and drag contributions. The consistent linearization of the weak form of such effects was obtained, permitting the use of Newton-Raphson method to solve risers’ dynamics using an implicit time-integration scheme. The riser-seabed interaction is also considered with a model that accounts for the possibility of rolling on the seabed. A catenary riser dynamics and a vertical riser experiencing parametric resonance due to heave-imposed motion were simulated. The model showed promising behavior to deal with large nonlinearities.
ó 2016 Elsevier Ltd. All rights reserved.
1. Introduction
The offshore oil exploitation involves usage of many structural solutions. These have to be designed to keep their functions under challenging environmental scenarios, such as very-deep water, severe sea waves, ice and others. Particularly, the present work focuses in risers’ analysis, which can be structurally-viewed as very slender beams, connecting the ?oating
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