Blar i NTNU Open på forfatter "Bihs, Hans"
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CFD Modeling of Local Scour Around a Pair of Tandem Cylinders under Wave Conditions
Ahmad, Nadeem; Bihs, Hans; Kamath, Arun; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)Local scour in a marine environment can lead to the failure of offshore and coastal structures. This is also the case, when marine infrastructure is built in Arctic conditions. The knowledge and understanding of erosion ... -
CFD Modeling of Varied Flow Conditions Over an Ogee-Weir
Fleit, Gabor; Baranya, Sandor; Bihs, Hans (Journal article, 2017)Accurate estimation of discharge capacity and local hydrodynamics are essential when designing hydraulic structures. Instead of the application of conventionally used empirical relationships, this study introduces a 3D ... -
CFD Modelling of Hydrodynamics in Land-Based Aquaculture Tanks
Lysø, Brage (Master thesis, 2020)Fisk er en effektiv kilde til viktige næringsstoffer på grunn av et rikt innhold av høyverdig protein, viktige vitaminer, mineraler og omega-3 fettsyrer, samt et lavt innhold av mettet fett, karbohydrater og kolesterol. I ... -
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 ... -
CFD Simulations of Multi-Directional Irregular Wave Interaction With a Large Cylinder
Wang, Weizhi; Kamath, Arun; Bihs, Hans (Chapter, 2018)Ocean waves are random by nature and can be regarded as a superposition of a finite number of regular waves travelling in different directions with different frequencies and phases. Cylinder-shaped objects are commonly ... -
CFD Simulations of Roll Motion of a Floating Ice Block in Waves using REEF3D
Bihs, Hans; Kamath, Arun; Alagan Chella, Mayilvahanan; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)Floating ice blocks in waves are generally seen in managed ice and in marginal ice zones. Detailed investigations into the hydrodynamics of a floating ice block provides insight into the interaction of floating ice with ... -
CFD Simulations of Wave Propagation and Shoaling over a Submerged Bar
Kamath, Arun; Bihs, Hans; Alagan Chella, Mayilvahanan; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)The wave propagation over a submerged bar is simulated using the open source CFD model REEF3D and the numerical results are compared to the experimental data. The transformation of the wave resulting in higher harmonics ... -
CFD Simulations to Determine Wave Forces on a Row of Cylinders
Kamath, Arun; Bihs, Hans; Alagan Chella, Mayilvahanan; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)The open source Computational Fluid Dynamics (CFD) model REEF3D is used to simulate interaction of low steepness linear waves and high steepness 5th-order Stokes waves with a single cylinder and linear arrays of two, three, ... -
Characteristics and Profile Asymmetry Properties of Waves Breaking over an Impermeable Submerged Reef
Alagan Chella, Mayilvahanan; Bihs, Hans; Myrhaug, Dag (Journal article; Peer reviewed, 2015)In the present study, a 3D two-phase flow CFD model that solves the unsteady, incompressible Reynolds-Averaged Navier–Stokes equations has been used to simulate breaking waves over an impermeable submerged reef. The level ... -
Characteristics of breaking irregular wave forces on a monopile
Aggarwal, Ankit; Bihs, Hans; Myrhaug, Dag; Alagan Chella, Mayilvahanan (Journal article; Peer reviewed, 2019)The substructures of offshore wind turbines are subjected to extreme breaking irregular wave forces. The present study is focused on investigating breaking irregular wave forces on a monopile using a computational fluid ... -
A comparison of different wave modelling techniques in an open-source hydrodynamic framework
Wang, Weizhi; Kamath, Arun; Pakozdi, Csaba; Bihs, Hans (Peer reviewed; Journal article, 2020)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 Investigations of Breaking Focused Wave-Induced Loads on a Monopile and the Effect of Breaker Location
Aggarwal, Ankit; Tomaselli, Danilo; Christensen, Erik Damgaard; Bihs, Hans (Journal article; Peer reviewed, 2020)The design of new offshore structures requires the calculation of the wave-induced loads. In this regard, the computational fluid dynamics (CFD) methodology has shown to be a reliable tool, in the case of breaking waves ... -
Computational Fluid Dynamics Simulations of Nonlinear Sloshing in a Rotating Rectangular Tank Using the Level Set Method
Grotle, Erlend Liavåg; Bihs, Hans; Æsøy, Vilmar; Pedersen, Eilif (Journal article; Peer reviewed, 2018)In this paper, numerical simulations of nonlinear sloshing in rectangular tanks are presented. Model implementations in the open source software reef3d are tested, and the results are compared with experimental data from ... -
Dam-Break Waves’ Hydrodynamics on Composite Bathymetry
von Häfen, Hajo; Krautwald, Clemens; Bihs, Hans; Goseberg, Nils (Peer reviewed; Journal article, 2022)Among others, dam-break waves are a common representation for tsunami waves near- or on-shore as well as for large storm waves riding on top of storm surge water levels at coasts. These extreme hydrodynamic events are a ... -
A direct forcing immersed boundary method for simulating floating objects
Soydan, Ahmet; Wang, Weizhi; Kamath, Arun; Bihs, Hans (Chapter, 2022)For ship and offshore applications, the fluid-floating object interaction is of particular importance and accurate numerical calculations are required. However, low-order accurate methods are not sufficient to have decent ... -
Effect of girder spacing and depth on solitary wave impact on coastal bridge deck for different airgaps
Moideen, Rameeza; Behera, Manas; Kamath, Arun; Bihs, Hans (Journal article; Peer reviewed, 2019)Coastal bridge damage has become a severe issue of concern in the recent past with the destruction of a considerable number of bridges under the impact of waves during tsunami and storm surges. These events have become ... -
Effects of Power Take-Off Damping and Model Scaling on the Hydrodynamic Performance of Oscillating Water Column Device
Ashlin, S John; Sannasiraj, S A; Sundar, Vallam; Kamath, Arun; Bihs, Hans (Chapter, 2019)A systematic numerical investigation on the hydrodynamic performance of an oscillating water column (OWC) system for different damping values from the power take-off (PTO) device and at different model scales has been ... -
Efficient Calculation of Spatial and Temporal Evolution of Hydrodynamic Loads on Offshore Wind Substructures
Pakozdi, Csaba; Kamath, Arun; Wang, Weizhi; Martin, Tobias; Bihs, Hans (Chapter, 2021)Estimation of the hydrodynamic loads based on strip theory with the Morrison equation provides a fast and inexpensive method for load estimation for the offshore industry. The advantage of this approach is that it requires ... -
Efficient Wave Modeling Using Non-Hydrostatic Pressure Distribution and Free Surface Tracking on Fixed Grids
Bihs, Hans; Kamath, Arun; Aggarwal, Ankit; Pakozdi, Csaba (Chapter; Peer reviewed, 2018)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 ...