Large amplitude motions of deepwater marine riser transporting fluid
Conference proceedings article
Authors/Editors
Strategic Research Themes
No matching items found.
Publication Details
Author list: Klaycham K., Athisakul C., Chucheepsakul S.
Publisher: International Society of Offshore and Polar Engineers
Publication year: 2018
Volume number: 2018-June
Start page: 78
End page: 85
Number of pages: 8
ISBN: 9781880653876
ISSN: 1098-6189
eISSN: 1098-6189
Languages: English-Great Britain (EN-GB)
Abstract
This paper presents a variational model of a deepwater marine riser transporting fluid capable of analyzing large amplitude motions. The riser model is formulated based on the virtual work-energy principle. The geometric nonlinearity is considered, which accounts for axial stretching and the deformed curvature of the riser. The finite element method is used to solve the numerical solution. The nonlinear stiffness matrices up to second order of riser displacements are kept in the equation of motion. The hydrodynamic force written in term of squared riser velocity also yields the nonlinear damping matrix. The inertial force induced by an unsteady flow of transported fluid is taken into consideration. Performing the Newmark time integration incorporated direct iteration on the equation of motion provides the nonlinear vibration response. For the parametric studies, the effect of forcing frequencies of hydrodynamic wave and internal pulsatile flow on the dynamic responses are highlighted. The special attentions are paid to the effect of nonlinear geometry on vibration amplitude of the riser. Copyright ฉ 2018 by the International Society of Offshore and Polar Engineers (ISOPE)
Keywords
Internal pulsatile flow, Large amplitude motion, Nonlinear geometry, Nonlinear vibration
Contact Information