The finite element analysis model of a top tensioned riser with hydro-pneumatic tensioner was established, considering the nonlinear stiffness and the kinematic relationship in the platform-tensioner-riser system.To establish a more applicable model, the actual riser string configuration and the effect of the Christmas tree were also considered.Subsequently, four kinds of tensioner models, i.e.a constant vertical tension model, a conventional simplified model, a linear spring-damper model and the proposed nonlinear spring-damper model, were comparatively studied.The results show that the constant vertical tension model is not recommended as it cannot reflect the actual tension in the tensioner and the response of the TTR.The conventional simplified model indeed overestimates the tension of tensioner and may lead to inaccurate estimation results of the TTR responses.The linear model is applicable when the environmental condition is relatively mild.It is strongly recommended to use the nonlinear model especially in harsher environmental conditions.
Key words
top tensioned riser /
hydro-pneumatic tensioner /
numerical modeling /
nonlinear
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