Blar i Institutt for bygg- og miljøteknikk på forfatter "Aggarwal, Ankit"
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3D Numerical Modelling of Non-Linear and Breaking Wave Forces On Offshore Wind Turbine Substructures
Aggarwal, Ankit (Doctoral theses at NTNU;2019:66, Doctoral thesis, 2019)Offshore wind energy technology has experienced a remarkable growth in the last few decades due to an increasing focus towards renewable energy research. The objective of the research towards offshore wind energy is to ... -
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 ... -
Calculation of Wave Forces on Offshore Wind Turbine Jacket Sub-structures using REEF3D
Shirinov, Seimur (Master thesis, 2018)Throughout the thesis work, the literature on computational fluid dynamics is reviewed and governing equations of the REEF3D are studied. Two different laboratory experiment setups are replicated in the numerical wave tank. ... -
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 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 ... -
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 ... -
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 ... -
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 ... -
Estimation of breaking wave properties and their interaction with a jacket structure
Aggarwal, Ankit; Bihs, Hans; Shirinov, Seimur; Myrhaug, Dag (Journal article; Peer reviewed, 2019)The numerical investigation of breaking wave interaction with jacket type offshore wind turbine substructures is quite challenging due to multiple jacket members and the complicated hydrodynamics of breaking waves around ... -
Free Surface Reconstruction for Phase Accurate Irregular Wave Generation
Aggarwal, Ankit; Pakzodi, Csaba; Bihs, Hans; Myrhaug, Dag; Alagan Chella, Mayilvahanan (Journal article; Peer reviewed, 2018)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 wave transformation and breaking processes in the coastal zone using REEF3D
Elakel, Mohamed (Master thesis, 2018)Several human activities and industries that contribute in shaping the communities and economies around the world are located in the coastal zone. Therefore, it is very crucial to understand the behaviour of the coastal ... -
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 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 Focussed Wave Hydrodynamics and Focused Wave-structure Interaction with REEF3D
Amarachaharam, Thevaher (Master thesis, 2016)General irregular sea state can generate very steep waves which can induce unpleasant dynamic wave loading to the structures. Sometimes these wave loads exceed upper design limits of the structure thus resulting in the ... -
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 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 ... -
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 ...