Blar i NTNU Open på forfatter "Arntsen, Øivind Asgeir"
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Influence of the upstream cylinder and wave breaking point on the breaking wave forces on the downstream cylinder
Kamath, Arun; Alagan Chella, Mayilvahanan; Bihs, Hans; Arntsen, Øivind Asgeir (Chapter, 2017)The interaction of breaking waves with marine structures involves complex free surface deformation and instantaneous loading on the structural members. A typical offshore platform or a coastal structure consists of several ... -
Large scale cfd modelling of wave propagation in Sulafjord for the E39 project
Wang, Weizhi; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Chapter; Peer reviewed, 2017)The coastal high way project E39 aims at building a continuous ferry-free road connection along the west coast of Norway. One of the major challenges in the project is to replace ferries with new fjord-crossing methods ... -
Large Scale CFD Modelling of Wave Propagation into Mehamn Harbour
Wang, Weizhi; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Chapter, 2017)Ocean wave propagations into harbours are large scale phenomena with complex wave transformations. Computational fluid dynamics (CFD) has the advantage of capturing most physics with few assumptions. It has also been ... -
Multi-directional Irregular Wave Modelling with CFD
Wang, Weizhi; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Chapter, 2019)The design of coastal structures requires accurate simulations of the wave conditions. Computational fluid dynamics (CFD) captures most complexities of the wave physics with few assumptions and therefore is considered to ... -
Numerical Investigation of Focused Waves and their Interaction with a Vertical Cylinder using REEF3D
Bihs, Hans; Alagan Chella, Mayilvahanan; Kamath, Arun; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2017)For the stability of offshore structures, such as offshore wind foundations, extreme wave conditions need to be taken into account. Waves from extreme events are critical from the design perspective. In a numerical wave ... -
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 (Chapter, 2017)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 ... -
Numerical Investigations of the Hydrodynamics of an Oscillating Water Column Device
Kamath, Arun; Bihs, Hans; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)An oscillating water column (OWC) device is a renewable energy device that is used to extract ocean wave energy through the action of waves on a partially submerged chamber consisting of an air and a water column. The ... -
Numerical Modeling of Power Take-Off Damping in an Oscillating Water Column Device
Kamath, Arun; Bihs, Hans; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)An Oscillating Water Column (OWC) is a wave energy converter consisting of a partially submerged chamber with an air column over the water column. The work done by the air column under excitation by the incident waves is ... -
Numerical Modelling of Arctic Coastal Erosion Due to Breaking Waves Impact Using REEF3D
Ahmad, Nadeem; Bihs, Hans; Alagan Chella, Mayilvahanan; Arntsen, Øivind Asgeir; Aggarwal, Ankit (Chapter, 2017)In the present study, numerical modelling breaking waves over a slope and the resulting erosion in the arctic region is presented. The study is performed with the open-source computational fluid dynamics (CFD) model REEF3D. ... -
Numerical Modelling of Irregular waves and Irregular Wave Forces with REEF3D
Aggarwal, Ankit (Master thesis, 2015)In this study, the irregular wave generation using the numerical model REEF3D is tested and validated. The testing for the empty wave tank is done in order to test the irregular wave generation and the propagation. The ... -
Numerical Modelling of Scour Around an Offshore Jacket Structure Using REEF3D
Ahmad, Nadeem; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Lecture Notes in Civil Engineering;LNCE, volume 22, Chapter, 2019)In the present paper, a numerical investigation of the scouring around offshore jacket structure is carried out. The open-source CFD model REEF3D is used for the numerical modelling. The model solves the Reynolds-averaged ... -
Numerical simulation of waves and local scour around vertical cylinders in a triangular arrangement using REEF3D
Ahmad, Nadeem; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Chapter, 2015)Coastal and offshore structures are generally supported by a group of cylinders. The stability of the structures can be threatened by sediment transport around the foundations. To explore this topic in detail, numerical ... -
Numerical study of irregular breaking wave forces on a monopile for offshore wind turbines
Aggarwal, Ankit; Alagan Chella, Mayilvahanan; Bihs, Hans; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2016)Offshore wind turbine substructures consisting of cylindrical members are exposed to highly non-linear and breaking waves in shallow waters [1]. Those structures experience extreme impulsive loads of short duration from ... -
Numerical study of wave transformation using the free surface reconstruction method
Aggarwal, Ankit; Alagan Chella, Mayilvahanan; Bihs, Hans; Pakzodi, Csaba; Arntsen, Øivind Asgeir (Chapter, 2017)The study of irregular wave field is complex due to its random hydrodynamic characteristics. Many experimental studies have been performed in the past to study irregular waves. However, numerical investigations are less ... -
Open-Source CFD in Marine Engineering
Bihs, Hans; Kamath, Arun; Alagan Chella, Mayilvahanan; Ahmad, Nadeem; Aggarwal, Ankit; Arntsen, Øivind Asgeir (Journal article, 2015)In the case of highly complex problems in the field of marine, coastal and ocean engineering involving the free surface, such as breaking wave kinematics or flow around slender structures, a detailed solution is required ... -
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 ... -
Simulation of floating bodies using a combined immersed boundary with the level set method in REEF3D
Bihs, Hans; Kamath, Arun; Lu, Jiayi Zheng; Arntsen, Øivind Asgeir (Chapter, 2017)The 6DOF algorithm implemented in the open-source computational fluid dynamics (CFD) model REEF3D is used to simulate a horizontal cylinder in heave motion around the free surface and the motion of a freely floating ... -
Study of water impact and entry of a free falling wedge using computational fluid dynamics simulations
Kamath, Arun; Bihs, Hans; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2017)Many offshore constructions and operations involve water impact problems such as water slamming onto a structure or free fall of objects with subsequent water entry and emergence. Wave slamming on semisubmersibles, vertical ... -
Three-dimensional CFD modeling of wave scour around side-by-side and triangular arrangement of piles with REEF3D
Ahmad, Nadeem; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)Sediment transport and resulting local scour in marine and coastal environments can lead to the failure of structures. The knowledge and understanding of erosion and sediment transport mechanisms and the correct prediction ... -
Three-dimensional numerical modeling of local scour around a non-slender cylinder under varying wave conditions
Ahmad, Nadeem; Afzal, Mohammad Saud; Bihs, Hans; Arntsen, Øivind Asgeir (Chapter, 2015)The three-dimensional numerical model REEF3D is used to simulate the detailed flow field and sediment transport around a non-slender cylinder under regular waves. The location of the free surface is calculated with the ...