• Algorithmic formulation of clay and sand pipe–soil interaction models for on-bottom stability analysis 

      Longva, Vegard; Ji, Guomin; Sævik, Svein; Ye, Naiquan; Gjøsteen, Janne Kristin Økland; Giertsen, Egil; Wang, Yanbin (Peer reviewed; Journal article, 2021)
      This paper presents a new algorithmic formulation of the clay and sand pipe–soil interaction models recommended by the DNV-RP-F109 code for dynamic on-bottom stability analysis of submarine pipelines. The pipe–soil force ...
    • An anisotropic friction model in non-bonded flexible risers 

      Dai, Tianjiao; Sævik, Svein; Ye, Naiquan (Journal article; Peer reviewed, 2018-05)
      The present paper addresses small scale friction tests and an anisotropic friction model to predict friction for the interface between the anti-wear tape and tensile armors in non-bonded flexible risers. Small scale friction ...
    • Analysis of full-scale riser responses in field conditions based on Gaussian mixture model 

      Wu, Jie; Eidnes, Sølve; Jin, Jingzhe; Lie, Halvor; Yin, Decao; Passano, Elizabeth Anne; Sævik, Svein; Riemer-Sørensen, Signe (Peer reviewed; Journal article, 2022)
      Offshore slender marine structures experience complex and combined load conditions from waves, current and vessel motions that may result in both wave frequency and vortex shedding response patterns. Field measurements ...
    • Effect of lay angle of anti-buckling tape on lateral buckling behavior of tensile armors 

      Zhou, Chongyao; Sævik, Svein; Ye, Naiquan; Ji, Guomin (ASME Proceedings | Pipeline and Riser Technology;OMAE2015-41527, Chapter, 2015-06)
      During deep water flexible pipe installation, the pipe is normally free hanging in empty condition from the installation vessel to the seabed. This will introduce large hydrostatic forces to the pipe causing true wall ...
    • Friction models for evaluating dynamic stresses in non-bonded flexible risers 

      Dai, Tianjiao; Sævik, Svein; Ye, Naiquan (Journal article; Peer reviewed, 2017-09)
      This paper addresses friction models used for evaluating dynamic stresses in non-bonded flexible risers. A review of the most commonly used methods to model friction between layers in such structures was performed. Four ...
    • Improved VIV Response Prediction Using Adaptive Parameters and Data Clustering 

      Wu, Jie; Yin, Decao; Lie, Halvor; Riemer-Sørensen, Signe; Sævik, Svein; Triantafyllou, Michael (Peer reviewed; Journal article, 2020)
      Slender marine structures such as deep-water riser systems are continuously exposed to currents, leading to vortex-induced vibrations (VIV) of the structure. This may result in amplified drag loads and fast accumulation ...
    • Non-Linear Clay Soil Model for Lateral Pipe-Soil Interaction 

      Agusta, Arifian; Ji, Guomin; Sævik, Svein (ASME Proceedings | Pipelines, Risers, and Subsea Systems;OMAE2016-54658, Chapter, 2016-06)
      This paper describes implementation and application of nonlinear lateral soil models for pipeline lateral buckling analysis. Several lateral soil models have been developed in the past and the model developed by Verley is ...
    • State-of-the-Art Review of Vortex-Induced Motions of Floating Offshore Wind Turbine Structures 

      Yin, Decao; Passano, Elisabeth; Jiang, Fengjian; Lie, Halvor; Wu, Jie; Ye, Naiquan; Sævik, Svein; Leira, Bernt Johan (Peer reviewed; Journal article, 2022)
      The motivation for this study is the fast development of floating offshore wind energy and the immature methodology and engineering practice related to predictions of vortex-induced motions (VIM). Benefiting from the oil ...
    • The Effect of Stick Stiffness of Friction Models on the Bending Behavior in Non-Bonded Flexible Risers 

      Dai, Tianjiao; Ye, Naiquan; Sævik, Svein (ASME Proceedings | Pipelines, Risers, and Subsea Systems;OMAE2017-62644, Chapter, 2017)
      This paper investigates the effect of stick stiffness on the bending behavior in non-bonded flexible risers. The stick stiffness was normally implemented in the friction model for calculating the friction stress between ...
    • The Effect of Stick Stiffness of Friction Models on the Bending Behavior in Non-Bonded Flexible Risers 

      Dai, Tianjiao; Ye, Naiquan; Sævik, Svein (ASME Proceedings | Pipelines, Risers, and Subsea Systems;OMAE2017-62644, Chapter, 2017-06-25)
      This paper investigates the effect of stick stiffness on the bending behavior in non-bonded flexible risers. The stick stiffness was normally implemented in the friction model for calculating the friction stress between ...
    • Time domain simulation of marine riser vortex-induced vibrations in three-dimensional currents 

      Kim, Sangwoo; Sævik, Svein; Wu, Jie; Leira, Bernt Johan (Peer reviewed; Journal article, 2022)
      One of the major uncertainties related to present Vortex-Induced Vibrations (VIV) prediction practice is related to the simplification of real multi-directional current profiles into equivalent uni-directional ones. This ...
    • Validation of vessel seakeeping model tuning algorithm based on measurements at model scale 

      Han, Xu; Leira, Bernt Johan; Sævik, Svein; Kaasen, Karl Erik (Peer reviewed; Journal article, 2021)
      Wave-induced vessel motion prediction plays a critical role in ensuring safe marine operations. The operational limiting criteria can usually be calculated by applying presumed linearized vessel motion transfer functions ...