• A 2D Experimental and Numerical Study of Moonpools With Recess 

      Ravinthrakumar, Senthuran; Kristiansen, Trygve; Ommani, Babak (ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering;OMAE2018-78326, Chapter, 2018-06-25)
      Moonpool resonance is investigated in a two-dimensional setting in terms of regular, forced heave motions of a model with moonpool with different rectangular-shaped recess configurations. A recess is a reduced draft zone ...
    • Bilge keel induced roll damping of an FPSO with sponsons 

      Ommani, Babak; Fonseca, Nuno; Kristiansen, Trygve; Bakksjø, Hanne (ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering - Volume 1: Offshore Technology;Offshore Geotechnics;OMAE2016-54420, Chapter, 2016-06)
      The bilge keel induced roll damping of an FPSO with sponsons is investigated numerically and experimentally. The influence of the bilge keel size, on the roll damping is studied. Free decay tests of a three-dimensional ...
    • Investigating a Simplified Model for Moonpool Piston Mode Response in Irregular Waves 

      Ommani, Babak; Kristiansen, Trygve; Berget, Kjetil (ASME digital collection;OMAE2018-78352, Chapter, 2018-06-25)
      Estimating moonpool piston mode response at resonance is important for operation safety. This is a difficult task, in particular, due to nonlinear nature of the moonpool response connected to the damping imposed by the ...
    • OC2018 A-116 - Loads, design and operation of floaters in the Arctic - Ptil – NORD ST20 

      Ommani, Babak; Berthelsen, Petter Andreas; Firoozkoohi, Reza (SINTEF Ocean rapporter;OC2018 A-116, Research report, 2018-12-11)
      This report presents results from hydrodynamic analysis of interaction between glacial ice and semisubmersible drilling units, as part of the Petroleum Safety Authority's project "NORD ST20 Loads, design and operation of ...
    • 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 ...
    • Waves' numerical dispersion and damping due to discrete dispersion relation 

      Ommani, Babak; Faltinsen, Odd Magnus (ASME Digital colletion;OMAE2014-23152,, Chapter, 2014-06)
      In linear Rankine panel method, the discrete linear dispersion relation is solved on a discrete free-surface to capture the free-surface waves generated due to wave-body interactions. Discretization introduces numerical ...