International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
권호 표지
DOI QR코드

DOI QR Code

Structural configurations and dynamic performances of flexible riser with distributed buoyancy modules based on FEM simulations

  • Chen, Weimin (State Key Laboratory of Marine Resource Utilization in South China Sea (Hainan University)) ;
  • Guo, Shuangxi (Institute of Mechanics, Chinese Academy of Sciences) ;
  • Li, Yilun (Universite Paris-Saclay, CentraleSupelec, CNRS, Laboratoire de Mecanique des Sols, Structures et Materiaux (MSSMat-UMR8579)) ;
  • Gai, Yuxin (School of Aeronautics Sciences and Engineering, Beihang University) ;
  • Shen, Yijun (State Key Laboratory of Marine Resource Utilization in South China Sea (Hainan University))
  • Received : 2021.01.25
  • Accepted : 2021.07.16
  • Published : 2021.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

Flexible risers are usually used as conveying systems to bring ocean resources from sea bed up to onshore. Under ocean environments, risers need to bear complex loads and it is crucial to comprehensively examine riser's configurations and to analyze structural dynamic performances under excitation of bottom vehicle motions, to guarantee structural safe operation and required service lives. In this study, considering a saddle-shaped riser, the influences of some important design parameters, including installation position of buoyancy modules, buoyancy ratio and motion of mining vehicle, on riser's configuration and response are carefully examined. Through our FEM simulations, the spatial distributions of structural tensions and curvatures along of riser length, under different configurations, are compared. Then, the impacts of mining vehicle motion on riser dynamic response are discussed, and structural tolerance performance is assessed. The results show that modules installation position and buoyancy ratio have significant impacts on riser configurations. And, an appropriate riser configuration is obtained through comprehensive analysis on the modules positions and buoyancy ratios. Under this proposed configuration, the structural tension and curvature could moderately change with buoyancy modules and bottom-end conditions, in other words, the proposed saddle-shaped riser has a good tolerance performance to various load excitations.

Keywords

Acknowledgement

The authors of this paper would like to thank the financial supports provided by the research funding sponsored by The State Key Laboratory of Marine Resource Utilization in the South China Sea (Hainan University) (Grant No. MRUKF2021027) and the Strategic Priority Research Programme of the Chinese Academy of Sciences (Grant No. XDA22000000).

References

  1. Ai, S., Xu, Y., Kang, Z., Yan, F., 2019. Performance comparison of stress-objective and fatigue-objective optimisation for steel lazy wave risers[J]. Ships Offshore Struct. 14 (6), 534-544. https://doi.org/10.1080/17445302.2018.1522054
  2. Chatjigeorgiou, I.K., 2010a. Three dimensional nonlinear dynamics of submerged, extensible catenary pipes conveying fluid and subjected to end-imposed excitations[J]. Int. J. Non Lin. Mech. 45 (7), 667-680. https://doi.org/10.1016/j.ijnonlinmec.2010.04.001
  3. Chatjigeorgiou, Ioannis K., 2010b. On the effect of internal flow on vibrating catenary risers in three dimensions[J]. Eng. Struct. 32, 3313-3329. https://doi.org/10.1016/j.engstruct.2010.07.004
  4. Cheng, Y., Tang, L., Fan, T., 2020. Dynamic analysis of deepwater steel lazy wave riser with internal flow and seabed interaction using a nonlinear finite element method[J]. Ocean Eng. 209, 107498. https://doi.org/10.1016/j.oceaneng.2020.107498
  5. Guo, S.X., Li, Y.L., Li, M., et al., 2018. Dynamic Response Analysis on Flexible Riser with Different Configurations in Deep-Water Based on FEM simulation[C]. OMAE2018. V005T04A016.
  6. Jang, H., Kim, J.W., 2019. Numerical Investigation for Vortex-Induced Vibrations of Steel-Lazy-Wave-Risers: Part II - CFD Study on Long Flexible riser[C]. OMAE 2019. V002T08A031.
  7. Jose, Azcona, Xabier, et al., 2017. Experimental validation of a dynamic mooring lines code with tension and motion measurements of a submerged chain[J]. Ocean Eng. 129, 415-427. https://doi.org/10.1016/j.oceaneng.2016.10.051
  8. Kim, H.T., O'Reilly, O.M., 2019. Instability of catenary-type flexible risers conveying fluid in subsea environments[J]. Ocean Eng. 173, 98-115. https://doi.org/10.1016/j.oceaneng.2018.12.042
  9. Li, Y., Guo, S., Chen, W., 2018. Analysis on multi-frequency vortex-induced vibration and mode competition of flexible deep-ocean riser in sheared fluid fields[J]. J. Petrol. Sci. Eng. 163, 378-386. https://doi.org/10.1016/j.petrol.2018.01.008
  10. Lou, M., Hu, P., Qi, X., et al., 2019. Stability analysis of deepwater compliant vertical access riser about parametric excitation[J]. Int. J. Naval Arch. Ocean Eng. 11, 970-979. https://doi.org/10.1016/j.ijnaoe.2019.04.007
  11. Mao, L., Liu, Q., Zhou, S., et al., 2016. Deep water drilling riser mechanical behavior analysis considering actual riser string configuration[J]. J. Nat. Gas Sci. Eng. 33, 240-254. https://doi.org/10.1016/j.jngse.2016.05.031
  12. Pearce JL, Sizer PS, Gano JC, Yonker JH, Thurman RL, O'Sullivan JF, et al., 1988. Method and system for maintenance and servicing of subsea wells. United States Parent No. 4,730,677.
  13. Santillan, S.T., Virgin, L.N., 2011. Numerical and experimental analysis of the static behavior of highly deformed risers[J]. Ocean Eng. 38 (13), 1397-1402. https://doi.org/10.1016/j.oceaneng.2011.06.009
  14. Tian, Y., Hou, Y., Pires, F., et al., 2015. Tensioned Step Riser Configuration for Ultradeep Application[C], ASME 2015, International Conference on Ocean, Offshore and Arctic Engineering. OMAE2015. V05AT04A056.
  15. Wang, J., Duan, M., 2015. A nonlinear model for deepwater steel lazy-wave riser configuration with ocean current and internal flow[J]. Ocean Eng. 94, 155-162. https://doi.org/10.1016/j.oceaneng.2014.11.025
  16. Wang, G., Liu, S.J., Li, L., 2007. FEM modeling for 3D dynamic analysis of deep-ocean mining pipeline and its experimental verification[J]. J. Cent. S. Univ. 14 (6), 808-813. https://doi.org/10.1007/s11771-007-0154-5
  17. Yin, D., Passano, E., Lie, H., et al., 2019. Experimental and numerical study of a top tensioned riser subjected to vessel motion[J]. Ocean Eng. 171, 565-574. https://doi.org/10.1016/j.oceaneng.2018.12.029
  18. Zienkiewicz, O.C., Taylor, R.L., 2005. The Finite Element Method[M].