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Ocean Systems Engineering
  Volume 8, Number 3, September 2018 , pages 247-279
DOI: https://doi.org/10.12989/ose.2018.8.3.247
 

Effects of geometric shape of LWSCR (lazy-wave steel catenary riser) on its global performance and structural behavior
Seungjun Kim and Moo-Hyun Kim

 
Abstract
    This study aims to investigate the behavioral characteristics of the LWSCR (lazy-wave steel catenary riser) for a turret-moored FPSO (Floating Production Storage Offloading) by using fully-coupled hull-mooring-riser dynamic simulation program in time domain. In particular, the effects of initial geometric profile on the global performance and structural behavior are investigated in depth to have an insight for optimal design. In this regard, a systematic parametric study with varying the initial curvature of sag and arch bend and initial position of touch down point (TDP) is conducted for 100-yr wind-wave-current (WWC) hurricane condition. The FPSO motions, riser dynamics, constituent structural stress results, accumulated fatigue damage of the LWSCR are presented and analyzed to draw a general trend of the relationship between the LWSCR geometric parameters and the resulting dynamic/structural performance. According to this study, the initial curvature of the sag and arch bend plays an important role in absorbing transferred platform motions, while the position of TDP mainly affects the change of static-stress level.
 
Key Words
    steel catenary riser; lazy-wave steel catenary riser; turret-moored FPSO; hull/mooring/riser coupled dynamic analysis; global dynamics; time-domain simulation; curvature; TDP; internal stress; fatigue; optimal design
 
Address
Seungjun Kim : Department of Construction Safety and Disaster Prevention Engineering, Daejeon University,
62 Daehak-ro, Dong-gu, Daejeon 34520, Republic of Korea
Moo-Hyun Kim: Department of Ocean Engineering, Texas A&M University, 3136 TAMU, College Station, TX 77843, USA
 

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