Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Numerical Study on Estimation of Static Configuration of Steel Lazy Wave Riser Using Dynamic Relaxation Method

동적이완법을 이용한 Steel Lazy Wave Riser의 정적형상 추정에 관한 수치해석적 연구

  • Oh, Seunghoon (Korea Research Institute of Ships and Ocean Engineering) ;
  • Jung, Jae-Hwan (Korea Research Institute of Ships and Ocean Engineering) ;
  • Park, Byeongwon (Korea Research Institute of Ships and Ocean Engineering) ;
  • Kwon, Yong-Ju (Korea Research Institute of Ships and Ocean Engineering) ;
  • Jung, Dongho (Korea Research Institute of Ships and Ocean Engineering)
  • 오승훈 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정재환 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 박병원 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 권용주 (한국해양과학기술원 부설 선박해양플랜트연구소) ;
  • 정동호 (한국해양과학기술원 부설 선박해양플랜트연구소)
  • Received : 2018.09.09
  • Accepted : 2018.11.19
  • Published : 2018.12.31
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Abstract

This paper presents an estimation method for the static configuration of a steel lazy wave riser (SLWR) using the dynamic relaxation method applied to estimate the configuration of structures with strong geometric non-linearity. The lumped mass model is introduced to reflect the flexible structural characteristics of the riser. In the lumped mass model, the tensions, shear forces, buoyancy, self-weights, and seabed reaction forces at nodal points are considered in order to find the static configuration of the SLWR. The dynamic relaxation method using a viscous damping formulation is applied to the static configuration analysis. Fictitious masses are defined at nodal points using the sum of the largest direct stiffness values of nodal points to ensure the numerical stability. Various case studies were performed according to the bending stiffness and size of the buoyancy module using the dynamic relaxation method. OrcaFlex was employed to validate the accuracy of the developed numerical method.

Keywords

References

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