• CFD Based Study of Steep Irregular Waves for Extreme Wave Spectra 

      Aggarwal, Ankit; Alagan Chella, Mayilvahanan; Bihs, Hans; Pakozdi, Csaba; Berthelsen, Petter Andreas; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2017-06-25)
      Offshore structures are exposed to irregular sea states. It consists of breaking and non-breaking waves. They experience extreme wave loads perpetually after being installed in the open ocean. Thus, the study of steep waves ...
    • CFD modelling of irregular and focused waves using wave reconstruction 

      Aggarwal, Ankit; Alagan Chella, Mayilvahanan; Bihs, Hans; Pakozdi, Csaba; Arntsen, Øivind Asgeir (Chapter, 2017)
      The real sea state is composed of the focused and steep irregular waves which makes their study very important in the design of offshore wind turbines. Computational Fluid Dynamics (CFD) can be used as an effective tool ...
    • A comparison of different wave modelling techniques in an open-source hydrodynamic framework 

      Wang, Weizhi; Kamath, Arun; Pakozdi, Csaba; Bihs, Hans (Journal article; Peer reviewed, 2020-07-16)
      Modern design for marine and coastal activities places increasing focus on numerical simulations. Several numerical wave models have been developed in the past few decades with various techniques and assumptions. Those ...
    • Complex geometry handling for a cartesian grid based solver 

      Bihs, Hans; Kamath, Arun; Alagan Chella, Mayilvahanan; Pakozdi, Csaba (Chapter, 2017)
      Complex geometries can be a challenge for computational fluid dynamics (CFD) solvers that use a Cartesian mesh. In the current paper, an algorithm is described with which complex geometry features can be incorporated in a ...
    • 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 ...
    • Dynamic Forces and Limiting Sea States for Installation of GRP Protection Covers 

      Solaas, Frøydis; Sandvik, Peter Christian; Pakozdi, Csaba; Kendon, Timothy Edward; Larsen, kjell; Myhre, Erling (ASME Proceedings | Torgeir Moan Honoring Symposium;OMAE2017-62499, Chapter, 2017-06-25)
      This paper describes a study aimed at finding and demonstrating a feasible method to reduce the uncertainties in calculation of dynamic forces and limiting sea states for installation of protection covers produced from ...
    • Efficient Wave Modeling Using Non-Hydrostatic Pressure Distribution and Free Surface Tracking on Fixed Grids 

      Bihs, Hans; Kamath, Arun; Aggarwal, Ankit; Pakozdi, Csaba (ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering;Volume 2: CFD and FSI;OMAE2018-78158, Chapter, 2018-06-25)
      For the estimation of wave loads on offshore structures, relevant extreme wave events need to be identified. In order to achieve this, long term wave simulations of relatively large scales need to be performed. Computational ...
    • Free Surface Reconstruction for Phase Accurate Irregular Wave Generation 

      Aggarwal, Ankit; Pakozdi, Csaba; Bihs, Hans; Myrhaug, Dag; Alagan Chella, Mayilvahanan (Journal article; Peer reviewed, 2018-09-29)
      The experimental wave paddle signal is unknown to the numerical modellers in many cases. This makes it quite challenging to numerically reproduce the time history of free surface elevation for irregular waves. In the present ...
    • Investigation of Higher-Harmonic Wave Forces and Ringing Using CFD Simulations 

      Kamath, Arun; Bihs, Hans; Pakozdi, Csaba (ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering;Volume 7B: Ocean Engineering;OMAE2018-77925, Chapter, 2018-06-25)
      Typical offshore structures are designed as tension-leg platforms or gravity based structures with cylindrical substructures. The interaction of waves with the vertical cylinders in high sea states can result in a resonant ...
    • Numerical Investigation of Irregular Breaking Waves for Extreme Wave Spectra Using CFD 

      Aggarwal, Ankit; Alagan Chella, Mayilvahanan; Bihs, Hans; Pakozdi, Csaba; Berthelsen, Petter Andreas; Arntsen, Øivind Asgeir (;ISOPE-I-17-460, Chapter, 2017-06)
      Offshore structures are exposed to irregular sea states. It consists of breaking and non-breaking waves. They experience breaking wave loads perpetually after being installed in the open ocean. Thus, the study of wave ...
    • Simulation of breaking focused waves over a slope with a CFD based numerical wave tank 

      Alagan Chella, Mayilvahanan; Bihs, Hans; Pakozdi, Csaba; Myrhaug, Dag; Arntsen, Øivind Asgeir (Chapter, 2017)
      Extreme wave conditions are always identified with large-amplitude breaking waves in shallow waters. Focused waves can often be used to describe extreme waves which evolve during the nonlinear wave-wave interaction, occurring ...