• Calibration of a Time-Domain Numerical Hydrodynamic Model for Mooring Analysis of a Semi-Submersible 

      Fonseca, Nuno; Stansberg, Carl Trygve (ASME digital collection;OMAE2018-78753, Chapter, 2018-06-25)
      The paper presents calibration of a time domain numerical model for the motions of the Exwave Semi in high seastates with current. The time domain equations of motion combine linear radiation, linear diffraction and second ...
    • Computational Fluid Dynamics Reproduction of Nonlinear Loads on a Vertical Column during Extreme Irregular Wave Events 

      Bachynski, Erin Elizabeth; Pakozdi, Csaba; Östman, Anders Lennart; Stansberg, Carl Trygve (Journal article; Peer reviewed, 2018-07-12)
      Recently, a method for numerical reproduction of measured irregular wave events has been developed. The measured motion of the wave maker flaps defines the wave kinematics at the boundary of the numerical simulation in ...
    • Experimental and Numerical Study of the Free Surface Elevation Over the Pontoons of a Semisubmersible Platform in Waves 

      Pessoa, João; Stansberg, Carl Trygve; Fonseca, Nuno; Laranjinha, Manuel (ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering - Volume 1: Offshore Technology;OMAE2018-78009, Chapter, 2018-06-25)
      The region over the pontoons, especially in the vicinity of columns, is typically a critical area in terms of upwell when analyzing the air gap of semisubmersible platforms. There is indication that numerical computations ...
    • LFCS Review report - Environmental conditions Wind, wave and current in coastal areas 

      Fergestad, Dag; Økland, Ole David; Stefanakos, Christos; Stansberg, Carl Trygve; Croonenborghs, Eloïse; Eliassen, Lene; Eidnes, Grim (SINTEF Ocean AS rapporter;OC2018 A‐073 - WP1, Research report, 2018-07-12)
      A review is performed on the description of evironmental conditions in Norwegian coastal areas in relation to Large Floating Coastal Structures and the planning of long floating bridges across fjords. First, an outline of ...
    • LFCS Review report – Model testing Model testing of large structures in a wave basin 

      Abrahamsen, Bjørn Christian; Stansberg, Carl Trygve (SINTEF Ocean AS rapporter;OC2018 A-073 - WP5, Research report, 2019-03-18)
      This document describes previous model tests on large structures in general and long pontoon bridges in particular. Furthermore, this report highlights the challenges related to model testing of these type of structures. ...
    • Low Frequency Excitation and Damping of Four MODUs in Severe Seastates With Current 

      Fonseca, Nuno; Stansberg, Carl Trygve; Larsen, Kjell; Bjørkli, Rune; Vigesdal, Tjerand; Dalane, Oddgeir (ASME digital collection;OMAE2018-77873, Chapter, 2018-06-26)
      Model tests have been performed with four mobile offshore drilling units (MODUs) with the aim of identifying wave drift forces and low frequency damping. The MODUs configuration is different, namely on the number and ...
    • Simulation of Low Frequency Motions in Severe Seastates Accounting for Wave-Current Interaction Effects 

      Ommani, Babak; Fonseca, Nuno; Stansberg, Carl Trygve (ASME Proceedings | Offshore Technology;OMAE2017-62550, Chapter, 2017-06-25)
      Today’s industry practice assumes wave drift forces on floating structures can be computed from zero current wave drift force coefficients for the stationary floater, while simplified correction models introduce current ...
    • Wave Drift Forces and Low Frequency Damping on the Exwave FPSO 

      Fonseca, Nuno; Stansberg, Carl Trygve (ASME Proceedings | Offshore Technology;OMAE2017-62540, Chapter, 2017-06-25)
      A method is followed in the present analysis to estimate realistic surge and sway wave drift force coefficients for the Exwave FPSO. Model test data is used to identify the difference frequency wave exciting force coefficients ...
    • Wave Drift Forces and Low Frequency Damping on the Exwave Semi-Submersible 

      Fonseca, Nuno; Stansberg, Carl Trygve (ASME Proceedings | Offshore Technology;OMAE2017-62539, Chapter, 2017-06-25)
      The paper presents realistic horizontal wave drift force coefficients and low frequency damping coefficients for the Exwave semi-submersible under severe seastates. The analysis includes conditions with collinear waves and ...