Blar i NTNU Open på forfatter "Alagan Chella, Mayilvahanan"
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A comparison of wave generation methods simulating extreme waves in a numerical wave tank
Alagan Chella, Mayilvahanan; Bihs, Hans; Arntsen, Øivind Asgeir (Chapter, 2017)Extreme wave conditions emanate from the random and instantaneous interaction of waves during storm events. These wave conditions may cause potentially severe damage to ships and offshore oil and gas structures. There are ... -
A New Level Set Numerical Wave Tank with Improved Density Interpolation for Complex Wave Hydrodynamics
Bihs, Hans; Kamath, Arun; Alagan Chella, Mayilvahanan; Aggarwal, Ankit; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2016)A new three-dimensional numerical wave tank is developed for the calculation of wave propagation and wave hydrodynamics by solving the incompressible Navier–Stokes equations. The free surface is modeled with the level set ... -
An investigation of wave impact pressures on an offshore wind turbine substructure subjected to breaking focused waves
Govindasamy, Vijaya Kumar; Alagan Chella, Mayilvahanan; Rajamanikkam, Panneer Selvam; Chakkurunni Palliyalil, Vipin (Chapter, 2017)Offshore Wind Turbines (OWT) are very attractive candidates for renewable energy production for several obvious reasons such as stronger wind speeds and cleaner energy production. Among the two variants of the OWT's, namely, ... -
Analysis of Different Methods for Wave Generation and Absorption in a CFD-Based Numerical Wave Tank
Miquel, Adria Moreno; Kamath, Arun; Alagan Chella, Mayilvahanan; Archetti, Renata; Bihs, Hans (Journal article; Peer reviewed, 2018)In this paper, the performance of different wave generation and absorption methods in computational fluid dynamics (CFD)-based numerical wave tanks (NWTs) is analyzed. The open-source CFD code REEF3D is used, which solves ... -
Breaking Characteristics and Geometric Properties of Spilling Breakers over Slopes
Alagan Chella, Mayilvahanan; Bihs, Hans; Myrhaug, Dag; Muskulus, Michael (Journal article; Peer reviewed, 2015)A two-phase flow CFD model based on the Reynolds-Averaged Navier–Stokes (RANS) equations coupled with the level set method (LSM) and k − ω turbulence model is used to simulate spilling breakers over a sloping bed. In order ... -
Breaking Focused Waves Generated Using the Transient Wave Packet Method and the Breaking Impact Forces on a Vertical Cylinder
Kamath, Arun; Alagan Chella, Mayilvahanan; Bihs, Hans (Chapter, 2019)The presence of vital offshore infrastructure in deeper waters makes it essential to be able to evaluate the properties of steepness-induced breaking waves. An extreme wave event in deep water can be modelled with a transient ... -
Breaking Wave Interaction with a Vertical Cylinder and the Effect of Breaker Location
Kamath, Arun; Alagan Chella, Mayilvahanan; Bihs, Hans; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2016)The open-source CFD model REEF3D is used to simulate plunging breaking wave forces on a vertical cylinder. The numerical results are compared with data from the experiments carried out at the Large Wave Channel, Hannover, ... -
Breaking wave interaction with tandem cylinders under different impact scenarios
Bihs, Hans; Kamath, Arun; Alagan Chella, Mayilvahanan; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2016)The interaction of plunging breaking waves with a pair of cylinders placed in tandem is investigated using an open-source computational fluid dynamics (CFD) model. The model is validated using experimental data for total ... -
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)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 Investigations of Wave Interaction with a Pair of Large Tandem Cylinders
Kamath, Arun; Alagan Chella, Mayilvahanan; Bihs, Hans; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)Wave forces and the flow field around cylinders placed in a periodic wave field are investigated with a numerical model using the Reynolds-averaged Navier–Stokes equations. The numerical model is validated by simulating ... -
CFD Modeling of Arctic Coastal Erosion due to Breaking Waves
Ahmad, Nadeem; Bihs, Hans; Alagan Chella, Mayilvahanan; Kamath, Arun; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2019)Computational fluid dynamics (CFD) modeling of breaking waves over a slope and the resulting erosion in the case of an Arctic coastline is presented in this study. The study is performed with the open-source numerical model ... -
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 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 ... -
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 ... -
Energy transfer due to shoaling and decomposition of breaking and non-breaking waves over a submerged bar
Kamath, Arun; Alagan Chella, Mayilvahanan; Bihs, Hans; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2017)Wave propagation over a submerged bar is simulated using the open source CFD model REEF3D with various incident wave heights to study shoaling, wave breaking features and the process of wave decomposition into higher ... -
Evaluating Wave Forces on Groups of Three and Nine Cylinders using a 3D Numerical Wave Tank
Kamath, Arun; Alagan Chella, Mayilvahanan; Bihs, Hans; Arntsen, Øivind Asgeir (Journal article; Peer reviewed, 2015)The evaluation of the complex wave regime due to wave interaction with a large group of cylinders placed in proximity requires an efficient and accurate numerical model. This paper presents the application of a two-phase ...