Browsing NTNU Open by Author "Bihs, Hans"
Now showing items 101-120 of 132
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Numerical Simulation of Free-Surface Waves past Two Semi-Submerged Horizontal Circular Cylinders in Tandem
Ong, Muk Chen; Kamath, Arun; Bihs, Hans; Afzal, Mohammad Saud (Journal article; Peer reviewed, 2017)Two-dimensional (2D) numerical simulations are performed to investigate free surface waves past two semi-submerged horizontal circular cylinders in tandem. The 2D simulations are carried out by solving the Unsteady ... -
Numerical Simulation of Hydrodynamics Around Net Meshes Using REEF3D
Wang, Gang; Martin, Tobias; Huang, Liuyi; Bihs, Hans (Chapter, 2020)Hydrodynamics and turbulence around net meshes have drawn more and more attention because it is closely related to forces on the structures and safety issues of offshore fish farms. In terms of numerical modeling of forces ... -
Numerical Simulation of Interactions between Water Waves and a Moored-Floating Breakwater
Martin, Tobias; Kamath, Arun; Bihs, Hans (Chapter, 2018)Floating breakwaters offer a cost-efficient alternative to common emerged rubble mound breakwaters in deep water coastal areas or harbors with poor seabed conditions. Often, simple box type structures with a suitable mooring ... -
Numerical Simulation of Wave Interaction with Submerged Porous Structures
Srineash, V.K.; Kamath, Arun; Murali, K.; Bihs, Hans (Peer reviewed; Journal article, 2020)The study of wave interaction with porous structures is essential as coastal structures are often porous in nature because of their prominent energy dissipation characteristics. The present work is focused on the numerical ... -
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 ... -
A Numerical Solution for Modelling Mooring Dynamics, Including Bending and Shearing Effects, Using a Geometrically Exact Beam Model
Martin, Tobias; Bihs, Hans (Peer reviewed; Journal article, 2021)During the operation of moored, floating devices in the renewable energy sector, the tight coupling between the mooring system and floater motion results in snap load conditions. Before snap events occur, the mooring line ... -
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 ... -
A Numerical Study of the Hydrodynamics of an Offshore Fish Farm Using REEF3D
Wang, Gang; Martin, Tobias; Huang, Liuyi; Bihs, Hans (Chapter, 2021)In this paper, the CFD framework REEF3D is utilized to investigate the hydrodynamics of a large offshore fish farm in waves. The solver consists of a rigid body dynamics solver for the frame structure coupled to a fluid ... -
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 ... -
Numerical Study on the Effect of a Submerged Breakwater Seaward of an Existing Breakwater for Climate Change Adaption
Sasikumar, Athul; Kamath, Arun; Musch, Onno; Lothe, Arne Erling; Bihs, Hans (Chapter, 2018)In coastal areas, climate change is causing mean sea level rise and more frequent storm surge events. This means the breakwaters are expected to withstand the action of more severe incident waves and larger overtopping ... -
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 ... -
Properties of breaking irregular waves over slopes
Aggarwal, Ankit; Alagan Chella, Mayilvahanan; Bihs, Hans; Myrhaug, Dag (Peer reviewed; Journal article, 2020)The present study numerically investigates the breaking and spectral characteristics and geometric properties of breaking irregular waves over slopes for different incident waves. The growth of wave non-linearity and wave ... -
Reduction of the wave propagation error of a sigma grid based numerical tank using a vertical spacing based on the constant truncation error
Pakozdi, Csaba; Wang, Weizhi; Kamath, Arun; Bihs, Hans (Peer reviewed; Journal article, 2021)Numerical wave models that solve the Laplace equation for the velocity potential with a -grid in the vertical direction have been proven to be flexible and efficient. However, it is observed that the dispersion relation ... -
REEF3D Wave Generation Interface for Commercial CFD Codes
Pakozdi, Csaba; Bihs, Hans; Kamath, Arun; Hermundstad, Elin Marita (Chapter, 2019)In recent years CFD developments have shown a trend to combine RANS CFD simulation with other methods such as wave theories or velocity potential based numerical wave tanks, in order to reduce to computation costs. This ... -
REEF3D Wave Generation Interface for Commercial Computational Fluid Dynamics Codes
Pakozdi, Csaba; Bihs, Hans; Kamath, Arun (Peer reviewed; Journal article, 2021)In recent years, computational fluid dynamics (CFD) developments have shown a trend to combine Reynolds-averaged Navier–Stokes (RANS) CFD simulation with other methods such as wave theories or velocity potential-based ... -
REEF3D::FNPF – A Flexible Fully Nonlinear Potential Flow Solver
Bihs, Hans; Wang, Weizhi; Pakozdi, Csaba; Kamath, Arun (Peer reviewed; Journal article, 2020)In situations where the calculation of ocean wave propagation and impact on structures are required, fast numerical solvers are desired in order to find relevant wave events. Computational fluid dynamics (CFD)-based numerical ... -
Representation of 3-h Offshore Short-Crested Wave Field in the Fully Nonlinear Potential Flow Model REEF3D::FNPF
Wang, Weizhi; Pakozdi, Csaba; Kamath, Arun; Bihs, Hans (Peer reviewed; Journal article, 2022)Stochastic wave properties are crucial for the design of offshore structures. Short-crested seas are commonly seen at the sites of offshore structures, especially during storm events. A long time duration is required in ... -
Representation of Breaking Wave Kinematics in the Fully Nonlinear Potential Flow Model REEF3D::FNPF
Pakozdi, Csaba; Kamath, Arun; Wang, Weizhi; Bihs, Hans (Chapter, 2020)Robust simulations over three-hours are essential to represent a stationary sea state and derive wave statistics and structural response of marine structures in a reliable manner. This means that the numerical model used ... -
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 in Waves and Mooring in a 3D Numerical Wave Tank using REEF3D
Martin, Tobias; Kamath, Arun; Bihs, Hans (Chapter, 2019)Mooring systems ensure the safety of structures near the shore like floating breakwaters and aquaculture cages by keeping them in position. Their design has to either provide enough flexibility to allow large displacements ...