Numerical model of a tensioner system and riser guide

  • Huang, Han (Offshore Engineering Department, American Bureau of Shipping) ;
  • Zhang, Jun (Ocean Engineering Program, Civil Engineering Department, Texas A&M University, College Station) ;
  • Zhu, Liyun (Ocean Engineering Program, Civil Engineering Department, Texas A&M University, College Station)
  • Received : 2013.09.28
  • Accepted : 2013.10.25
  • Published : 2013.12.25


Top tensioned riser (TTR) is often used in a floating oil/gas production system deployed in deep water for oil/gas transport. This study focuses on the extension of the existing numerical code, known as CABLE3D, to allow for static and dynamic simulation of a TTR connected to a floating structure through a tensioner system or buoyancy can, and restrained by riser guides at different elevations. A tensioner system usually consists of three to six cylindrical tensioners. Although the stiffness of individual tensioner is assumed to be linear, the resultant stiffness of a tensioner system may be nonlinear. The vertical friction between a TTR and the hull at its riser guide is neglected assuming rollers are installed there. Near the water surface, a TTR is forced to move horizontally due to the motion of the upper deck of a floating structure as well as related riser guides. The extended CABLE3D is then integrated into a numerical code, known as COUPLE, for the simulation of the dynamic interaction among the hull of a floating structure, such as spar or TLP, its mooring system and riser system under the impact of wind, current and waves. To demonstrate the application of the extended CABLE3D and its integration with COUPLE, the numerical simulation is made for a truss spar under the impact of Hurricane "Ike". The mooring system of the spar consists of nine mooring lines and the riser system consists of six TTRs and two steel catenary risers (SCRs).


  1. API Recommended Practice 2RD (2006), Design of Risers for Floating Production Systems (FPSs) and Tension-Leg Platforms (TLPs), American Petroleum Institute, Washington, DC.
  2. Cao, P.M. and Zhang, J. (1997), "Slow motion responses of compliant offshore structures", Int. J. Offshore Polar, 7(2), 119-126.
  3. Chen, C.Y., Kang, C,H. and Mills, T. (2008), "Coupled spar response with buoyancy cans vs. Tensioners", Proceedings of the 18th International Offshore and Polar Engineering Conference, Vancouver.
  4. Chen, C.Y. and Nurtjahyo, P. (2004), "Numerical prediction of spar motions considering top tension riser stiffness", Proceedings of the OMAE04, 23rd International Conference on Offshore Mechanics and Arctic Engineering, Vancouver.
  5. Chen, X.H. (2002), Studies on dynamic interaction between deep-water floating structure and their mooring/tendon systems, PhD thesis, Texas A&M University, US.
  6. FloaTEC, RPSEA CTR 1402 (2009), Ultra deepwater dry tree system for drilling and production in GOM, Stage 1 Study Report, June 19 2009, FloaTEC project# 08110.
  7. Garrett, D.L. (1982), "Dynamic analysis of slender rods", J. Energ. Resour - ASME, 104, 302-307.
  8. Kiecke, A.F. (2011), Simulated fatigue damage index on mooring lines of a Gulf of Mexico truss spar determined from recorded field data, MS Thesis, Ocean Engineering Program, Civil Engineering Department, Texas A&M University, US.
  9. Kim, M.H. and Chen, W. (1994), "Slender-body approximation for slowly-varying wave loads in multi-direction waves", Proceedings of the 6th Offshore and Polar Engineering Conference.
  10. Koo, B.J., Kim, M.H. and Randall, R. (2004), "The effects of nonlinear multi-contact coupling with gap between risers and guide frame on global spar motion analysis", Ocean Eng., 31, 1469-1502.
  11. Li, C.X. (2012), Coupled analysis of the motion and mooring loads of a spar 'Constitution', MS Thesis, Ocean Engineering Program, Civil Engineering Department, Texas A&M University, US.
  12. Ma, W. and Webster, W.C. (1994), An analytical approach to cable dynamics: theory and user manual, Sea Grant Project R/OE-26.
  13. Magee, A., Sablock, A., Maher, J., Halkyard, J., Finn, L. and Dutta, I. (2000), "Heave plate effectiveness in the performance of the truss spar", Proceedings of the ETCE/OMAE2000 Joint Conference on Energy for the New Millennium, New Orleans.
  14. Morison, J.R., O?Brien, M.P., Johonson, J.W. and Shaaf, S.A. (1950), "The forces exerted by surface waves on plies", Petrol. Trans. AIME, 189, 149-154.
  15. Murray, J., Tahar, A. and Yang, C.K. (2007), "Hydrodynamics of dry tree semisubmersible", Proceedings of the ISOPE'07, Lisbon.
  16. Murray, J., Tahar, A. and Eilertsen, T. (2006), "A comparative assessment of spar, tension leg platform and semisubmersible floaters for deepwater application", Proceedings of the DOT International Conference and Exhibition.
  17. Perryman, S., Gebara, J., Botros, F. and Yu, A. (2005), Holstein truss spar and top tensioned riser system design challenges and innovations, OTC 17292.
  18. Prislin, I., Rainford, D., Perryman, S. and Schilling, R. (2005), Use of field monitored data for improvement of existing and future offshore facilities, SNAME Paper D5.
  19. Webster, R.L. (1975), "Non-linear static and dynamic response of underwater cable structures using finite element approach", Proceedings of the 7th Offshore Technology Conference, Houston.
  20. Webster, W.C. (1995), "Mooring induced damping", Ocean Eng., 22, 57-591.
  21. Yang, C.K and Kim, M.H. (2010), "Linear and nonlinear approach of hydropneumatic tensioner modeling for spar global performance", J. Offshore Mech. Arct., 132(1).
  22. Yang, C.K and Kim, M.H. (2011), "The structural safety assessment of a tie-down system on a tension leg platform during hurrycane events", Ocean Syst. Eng., 1(4), 263-283.

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