• Hybrid testing of deep water moored structures 

      Moen, Fredrik Storflor (Master thesis, 2014)
      This thesis presents a design concept for deep water model testing of moored floating offshore structures in ocean basin, and presents a single degree of freedom (SDOF) test setup for this purpose. Conventional methods has ...
    • Improved In-Line VIV Prediction for Combined In-Line and Cross-Flow VIV Responses 

      Yin, Decao; Passano, Elizabeth; Larsen, Carl Martin (Journal article; Peer reviewed, 2017)
      Slender marine structures are subjected to ocean currents, which can cause vortex-induced vibrations (VIV). Accumulated damage due to VIV can shorten the fatigue life of marine structures, so it needs to be considered in ...
    • Non-linear time domain analysis of cross-flow vortex-induced vibrations 

      Thorsen, Mats Jørgen; Sævik, Svein; Larsen, Carl Martin (Journal article; Peer reviewed, 2017)
      A previously proposed hydrodynamic load model for time domain simulation of cross-flow vortex-induced vibrations (VIV) is modified and combined with Morison's equation. The resulting model includes added mass, drag and a ...
    • Non-linear time domain analysis of vortex induced vibrations 

      Ulveseter, Jan Vidar (Master thesis, 2015)
      In this thesis a model for nonlinear analysis of vortex induced vibrations (VIV), applied to free spanning pipelines, is proposed. The developed model takes into account the soil-pipe interaction. Through case studies, ...
    • Non-linear Wave Loads on Offshore Wind Support Structure 

      Chen, Jinchao (Master thesis, 2014)
      Offshore wind development is constrained by its high cost. One potential way to meet this challenge is to reduce the uncertainty in wave modeling and hydrodynamic loads calculation for offshore wind support structures ...
    • OMAE2017-61362 Consolidation of Empirics for Calculation of VIV Response 

      Voie, Per Erlend; Wu, Jie; Resvanis, Themistocles; Larsen, Carl Martin; Vandiver, Kim; Triantafyllou, Michael S.; Baarholm, Rolf Jarle (Chapter; Peer reviewed, 2017)
      The present paper consolidates available experimental results for both sub-critical and critical Reynolds numbers and varying surface roughness and formulates a coefficient excitation model that aims at unbiased response ...
    • OMAE2017-61715 Improved in-line VIV Prediction for combined in-line and Cross-Flow VIV Responses 

      Yin, Decao; Passano, Elisabeth; Larsen, Carl Martin (Chapter; Peer reviewed, 2017)
      Slender marine structures are subjected to ocean currents, which can cause vortex-induced vibrations (VIV). Accumulated damage due to VIV can shorten the fatigue life of marine structures, so it needs to be considered in ...
    • On the significance of the higher-order stress in riser vortex-induced vibrations responses 

      Wu, Jie; Yin, Decao; Lie, Halvor; Larsen, Carl Martin; Baarholm, Rolf Jarle; Liapis, Stergios (Journal article; Peer reviewed, 2019)
      Vortex-induced vibrations (VIV) can lead to fast accumulation of fatigue damage and increased drag loads for slender marine structures. VIV responses mainly occur at the vortex shedding frequency, while higher harmonics ...
    • Simulating fundamental and higher harmonic VIV of slender structures 

      Ulveseter, Jan Vidar; Thorsen, Mats Jørgen; Sævik, Svein; Larsen, Carl Martin (Journal article; Peer reviewed, 2019)
      Vortex-induced vibrations (VIV) of slender marine structures are complicated response processes, where a number of distinct frequency components might be simultaneously active. These are categorized as fundamental and ...
    • Simulation of drilling riser disconnection - Recoil analysis 

      Grønevik, Arild (Master thesis, 2013)
      The emergency disconnection system and recoil analysis is required for every offshore drilling unit. Situations can occur where the vessel needs to disconnect from the well, it can be to large forces that are being transferred ...
    • SIMULATION OF RISER DISCONNECTION IN STOCHASTIC WAVES 

      Kinge, Helene Ruth Minet (Master thesis, 2014)
      Ever since the first oil was discovered in Norway in 1971 the production rates have varied. The development has gone from few wells with high production rates to several wells with lower production rates. It is expected ...
    • Slug flow and waves induced motions in flexible riser 

      Ortega Malca, Arturo Jesus; Rivera Medina, Ausberto; Larsen, Carl Martin (Journal article; Peer reviewed, 2018)
      Flexible risers provide optimum solutions for deep water offshore fields. Reliable dynamic analysis of this kind of slender structure is crucial to ensure safety against long time fatigue failure. Beyond the effects from ...
    • STATISTICS OF BENDING MOMENT IN THE SPLASH ZONE OF A TENSIONED RISER 

      Gan, Xiao (Master thesis, 2014)
      The main idea of SLTS method is to find a design storm that the extreme responses of a structure in its design lifetime can be obtained from this seastate, instead of performing full long-term time-domain dynamic analysis. ...
    • Stochastic modelling of cross-flow vortex-induced vibrations 

      Ulveseter, Jan Vidar; Thorsen, Mats Jørgen; Sævik, Svein; Larsen, Carl Martin (Journal article, 2017)
      Semi-empirical models are commonly used to predict vortex-induced vibrations (VIV). Empirical parameters are often based on forced harmonic motion tests of short rigid cylinders in one degree of freedom, which is a significant ...
    • Time Domain Analysis of Vortex-Induced Vibrations 

      Thorsen, Mats Jørgen (Doctoral thesis at NTNU;2016:231, Doctoral thesis, 2016)
      This thesis deals with the development of a new empirical model of the hydrodynamic loads associated with vortex-induced vibrations (VIV) of slender circular cylinders. The most commonly used VIV analysis tools operate in ...
    • Time domain model for calculation of pure in-line vortex-induced vibrations 

      Ulveseter, Jan Vidar; Sævik, Svein; Larsen, Carl Martin (Journal article; Peer reviewed, 2017)
      A time domain model for prediction of cross-flow vortex-induced vibrations (VIV) of slender structures with circular cross section has been under development since 2012. As an extension of this work, a time domain model ...
    • Time domain simulation of riser VIV in current and irregular waves 

      Ulveseter, Jan Vidar; Thorsen, Mats Jørgen; Sævik, Svein; Larsen, Carl Martin (Journal article; Peer reviewed, 2018)
      A semi-empirical prediction tool for time domain analysis of cross-flow and in-line vortex-induced vibrations (VIV) is proposed. The model combines concepts from previous publications in a new way, which allows for time ...
    • Time domain simulation of vortex-induced vibrations in stationary and oscillating flows 

      Thorsen, Mats Jørgen; Sævik, Svein; Larsen, Carl Martin (Journal article, 2016)
      This paper focuses on the further development of a previously published semi-empirical method for time domain simulation of vortex-induced vibrations (VIV). A new hydrodynamic damping formulation is given, and the necessary ...
    • Two-way coupled fluid-structure interaction of gas-liquid slug flow in a flexible riser: Small-scale experiments and simulations 

      Vieiro Medina, Joaquin Jose; Akhiiartdinov, Anvar; Sævik, Svein; Larsen, Carl Martin; Nydal, Ole Jørgen (Journal article; Peer reviewed, 2019)
      Flexible risers might be subjected to large pressure and density fluctuations when transporting multiphase mixtures as different flow patterns may take place. Those fluctuations might induce large forces on the structure, ...
    • Vortex Induced Fatigue Damage of a Steel Catenary Riser near the Touchdown Point 

      Lejlic, Emir (Master thesis, 2013)
      In this thesis, the fatigue damage of a steel catenary riser was investigated, especially in the vicinity of the touchdown point.The steel catenary riser is a promising riser solution due to its simplicity and low cost. ...