Critical top tension of an extensible catenary riser
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Author list: Athisakul C., Klaycham K., Phanyasahachart T., Chucheepsakul S.
Publication year: 2011
Start page: 50
End page: 56
Number of pages: 7
ISBN: 9781880653968
ISSN: 1098-6189
eISSN: 1098-6189
Languages: English-Great Britain (EN-GB)
Abstract
This paper aims to present the critical top tension of an extensible catenary riser. The extensible elastica theory and the virtual workenergy principle are used to develop the variational model formulation. The deformation of riser is described in view of total Lagrangian coordinate. The finite element method is used to obtain the numerical solutions. For stability verification, the method of adjacent nonlinear equilibrium is exploited. The critical top tension is investigated and is verified by the shooting method. The results show that the minimum applied top tension, which keeps the riser in equilibrium state, is the critical top tension. If the applied top tension is greater than the critical top tension, there are two possible equilibrium configurations; the one with smaller displacement is stable, while the other is unstable. Copyright ฉ 2011 by the International Society of Offshore and Polar Engineers (ISOPE).
Keywords
Catenary Riser, Critical applied top tension, Variational formulation
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