• A Numerical Study on Stratified Shear Layers With Relevance to Oil-Boom Failure 

      Kristiansen, David; Faltinsen, Odd Magnus (ASME Digital colletion;OMAE2014-23981, Chapter, 2014-06)
      Interface dynamics of two-phase flow, with relevance for leakage of oil retained by mechanical oil barriers, is studied by means of a 2D lattice-Boltzmann method combined with a phase-field model for interface capturing. ...
    • Classification of Aquaculture Locations in Norway With Respect to Wind Wave Exposure 

      Lader, Pål; Kristiansen, David; Alver, Morten; Bjelland, Hans Vanhauwaert; Myrhaug, Dag (ASME Digital collection;OMAE2017-61659, Chapter, 2017)
      In Norway there are a total of 1070 registered sites for salmon farming all along the coast. Trends in the aquaculture industry in the recent decade are that salmon farming sites tend to gradually relocate to more wave and ...
    • Current induced drag forces on cultivated sugar kelp 

      Endresen, Per Christian; Norvik, Carina; Kristiansen, David; Birkevold, Jens; Volent, Zsolt (Chapter, 2019-06)
      To obtain more knowledge of current induced drag forces on sugar kelp, towing tests with ropes containing cultivated sugar kelp was conducted. As freshwater may damage the kelp and cause changes in its mechanical response, ...
    • Environmental Description in the Design of Fish Farms at Exposed Locations 

      Kristiansen, David; Aksnes, Vegard Øgård; Su, Biao; Lader, Pål; Bjelland, Hans Vanhauwaert (ASME Proceedings | Ocean Space Utilization;OMAE2017-61531, Chapter, 2017-06-25)
      This paper addresses the description of exposure from waves and currents in coastal regions for design of marine fish farms. Representative descriptions of environmental conditions are important inputs to the design and ...
    • Modelling of Hydrodynamic Loads on Aquaculture Net Cages by a Modified Morison Model 

      Bore, Pål Takle; Amdahl, Jørgen; Kristiansen, David (Chapter, 2017)
      A modified Morison model is presented for calculation of hydrodynamic forces on aquaculture net cages. The model is based on a simple method for conversion of \textit{"screen model force coefficients"} to approximate ...
    • Numerical and experimental study on the drainage and collapse of a floating flexible bag structure 

      Kristiansen, David; Su, Biao; Volent, Zsolt (Journal article; Peer reviewed, 2018-11)
      This paper addresses the possible drainage and collapse of closed flexible cages in sea-based fish farming. A closed flexible cage is a floating bag structure containing water that is enclosed from the ambient water. ...
    • Numerical and Experimental Study on the Seakeeping Behavior of Floating Closed Rigid Fish Cages 

      Kristiansen, David; Lader, Pål Furset; Endresen, Per Christian; Aksnes, Vegard Øgård (ASME digital collection;OMAE2018-77254, Chapter, 2018-06-25)
      The present paper addresses the seakeeping behavior of a rigid type of floating closed fish cages, with focus on effects of sloshing on the coupled motions and mooring loads. Closed cages have gained much attention recently ...
    • Numerical Study of a Fishing Vessel Operating in Partially Ice Covered Waters 

      Aarsæther, Karl Gunnar; Su, Biao; Kristiansen, David (ASME digital collection;OMAE2018-77464, Chapter, 2018-06)
      The Arctic ocean has been the focus of increasing activities in oil and gas, marine traffic and fisheries as the resources in the Arctic area becomes more attractive for exploitation. There have been several studies on the ...
    • Numerical Study of a Moored Structure in Moving Broken Ice Driven by Current and Wave 

      Su, Biao; Kristiansen, David; Aarsæther, Karl Gunnar (ASME Digital colletion;OMAE2017-61252, Chapter, 2017-06-25)
      This paper presents a numerical model intended to simulate the mooring load and the dynamic response of a moored structure in drifting ice. The mooring lines were explicitly modelled by using a generic cable model with a ...
    • Numerical study of closed rigid fish cages in waves and comparison with experimental data 

      Su, Biao; Tsarau, Andrei; Endresen, Per Christian; Kristiansen, David; Lader, Pål Furset (Peer reviewed; Journal article, 2021)
      Closed fish cages have gained increased interest in marine aquaculture. However, knowledge on the seakeeping behaviour of a floating closed cage and the influence of the contained water inside the cage are still limited. ...
    • NumSim - Numerical simulation of complex systems involving interaction between elements with large and varying stiffness properties 

      Kristiansen, David; Føre, Martin; Aarsæther, Karl Gunnar; Fredheim, Arne (SINTEF Fiskeri og Havbruk reports;A27066, Research report, 2015-07-31)
      This report is a short summa ry of the research activity and results obtained in the project Numsim - Numerical simulation of complex systems involving interaction between elements with large and varying stiffness properties. ...
    • Sloshing in a rotating liquid inside a closed sea cage for fish farming 

      Tsarau, Andrei; Lugni, Claudio; Lucarelli, Alessia; Kristiansen, David; Lader, Pål Furset (Peer reviewed; Journal article, 2021)
      Sloshing in a sea cage with a slowly rotating liquid is investigated. The cage is axisymmetric, and the liquid is subjected to a nearly uniform angular velocity about the vertical axis of the cage. Both experimental and ...
    • Statistical modelling of extreme ocean current velocity profiles 

      Bore, Pål Takle; Amdahl, Jørgen; Kristiansen, David (Journal article; Peer reviewed, 2019-08-15)
      Knowledge about extreme ocean currents and their vertical structure is important when designing offshore structures. We propose a method for statistical modelling of extreme vertical current velocity profiles, accounting ...