Blar i UiS Brage på forfatter "Obhrai, Charlotte"
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A Study of the Coherences of Turbulent Wind on a Floating Offshore Wind Turbine
Putri, Rieska Mawarni (Masteroppgave/UIS-TN-IKM/2016;, Master thesis, 2016-06)In the development of offshore wind turbine industry, the shift from the use of fixed-substructure wind turbines to the floating wind turbines is expected to maximise the offshore wind power extraction while reducing ... -
Accurate predictions of the Ultimate Limit State Wave Loads on Bottom Fixed Wind Turbine
Reisæter, Vegard Risa (Master thesis, 2022)In this project the breaking wave loads on a bottom fixed monopile has been determined with the use of the Pressure Impulse Model. The pressure impulse model is the integral of pressure dependent by time during a short ... -
CFD simulations of violent breaking wave impacts on a vertical wall using a two-phase compressible solver
Liu, Shengnan; Gatin, Inno; Obhrai, Charlotte; Ong, Muk Chen; Jasak, Hrvoje (Peer reviewed; Journal article, 2019)Four different types of breaking wave impacts on a vertical wall are simulated using a two-dimensional two-phase Computational Fluid Dynamic (CFD) model. Air is considered as an isentropic ideal gas without solving an ... -
Challenges and Prospects of Using Subsea Production Units on the Shelf of the Russian Federation
Makhoshvili, Alexey (Master thesis, 2021)The Master Thesis briefly presents the natural and climatic conditions of the Pechora Sea. The technologies of subsea production, the justified conditions of their use and their layout options are considered. The readiness ... -
Comparison of weather data from FINO3 and ERA5 in Wind Farm Installation Campaign Simulations.
Kleppa, Olav (Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-06-30)Weather data are commonly used in the planning phase of an offshore wind farm installation campaign. Knowledge of site-specific weather conditions is of great importance regarding transport and installation as well as ... -
The COTUR project: remote sensing of offshore turbulence for wind energy application
Cheynet, Etienne; Flügge, Martin; Reuder, Joachim; Jakobsen, Jasna Bogunovic; Heggelund, Yngve; Svardal, Benny; Saavedra Garfias, Pablo Andres; Obhrai, Charlotte; Daniotti, Nicolo; Berge, Jarle; Duscha, Christiane Anabell; Wildmann, Norman; Onarheim, Ingrid Husøy; Godvik, Marte (Peer reviewed; Journal article, 2021-09)The paper presents the measurement strategy and data set collected during the COTUR (COherence of TURbulence with lidars) campaign. This field experiment took place from February 2019 to April 2020 on the southwestern coast ... -
Development of technical and technological solutions for the integrated development of the Leningradskoye and Rusanovskoye fields
Aliev, Orudzh (Master thesis, 2023)Today, the development of oil and gas fields on the Arctic coasts and the continental shelf is an important and relevant direction in the development of the Russian oil and gas complex. The shelf of the Kara Sea is one of ... -
Estimation of the frequency of breaking waves in deep water from 3D laboratory measurements
Amar, Robel Mussie (Masteroppgave/UIS-TN-IMBM/2019;, Master thesis, 2019-12)Wave breaking is an essential aspect of the sea surface process. Although being an emerging area of research over the last 50 years, the phenomenon remains to be fully understood due to the erratic behavior of breaking ... -
Feasibility Analysis of Floating Offshore Wind in Svalbard
Drummond, Michael (Master thesis, 2022)Svalbard is a Norwegian island archipelago located far north in the Arctic with Longyearbyen its largest settlement. Fossil fuel in the form of diesel generators or coal power plants is still the primary energy source in ... -
Improved Wind Power Estimation Method for O&M of Offshore Wind Farm
Esteves Lopes, Priscila (Master thesis, 2021)Offshore wind is a rapidly maturing renewable energy technology that is poised to play an important role in future energy systems. In 2018, offshore wind provided a tiny fraction of global electricity supply, but it is set ... -
The Influence of Unstable Wind Models on the Motions and Loads of a Semi-Submersible Floating Wind Turbine
Zeringue, Rachel (Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-07-14)As the wind turbine industry continues to play a part in the production of energy, the need for larger and more powerful wind turbines keeps increasing. The movement towards offshore wind turbine structures provides ... -
Lateral correlation of wind speed at near-shore site; case study
Zangiabadi, Bizhan (Master thesis, 2021)The main goal in this study was to study the non-neutral conditions in offshore environment and eventually study the horizontal stability in the wind patterns offshore. To assess the horizontal stability, data from the a ... -
Methods for analysing wave slamming loads on truss structures used in offshore wind applications based on experimental data
Jose, Jithin; Podrazka, Olga; Obhrai, Charlotte; Gudmestad, Ove Tobias; Cieslikiewicz, Witold (Peer reviewed; Journal article, 2016)Offshore wind turbines installed in shallow water regions are subjected to highly varying hydrodynamic loads, also from plunging breaking waves. Many investigations have been made regarding the wave slamming forces acting ... -
Models for optimising power consumption to generation in captive solar projects
Awada, Ali (Master thesis, 2022)Kube Energy is a renewable energy services company that has most of its solar power plants planned around a single or multiple off-takers (end-users) connected in a small mini-grid. What is common for these off-takers is ... -
Numerical Analysis of the Effect of Offshore Turbulent Wind Inflow on the Response of a Spar Wind Turbine
Putri, Rieska Mawarni; Obhrai, Charlotte; Jakobsen, Jasna Bogunovic; Ong, Muk Chen (Peer reviewed; Journal article, 2020)Turbulent wind at offshore sites is known as the main cause for fatigue on offshore wind turbine components. Numerical simulations are commonly used to predict the loads and motions of floating offshore wind turbines; ... -
Occurrence of Wind-Wave Misalignment using FINO and OBLEX data
Lasut, Antonius (Masteroppgave/UIS-TN-IMBM/2018;, Master thesis, 2018-06-15)Wind-wave interaction has been an important aspect of environmental conditions to be considered for offshore wind turbine performance, especially in deeper water at stable atmospheric conditions such as North Sea. It is ... -
Offshore Structures Exposed to Large Slamming Wave Loads
Jose, Jithin (PhD thesis UiS;, Doctoral thesis, 2017-12)In sloping shallow water regions, waves undergo different nonlinear transformations such as wave shoaling and breaking, due to the nonlinear wave interactions with the seabed. The forces from breaking waves are of concern ... -
Offshore Wind Turbine Loads and Motions in Unstable Atmospheric Conditions
Putri, Rieska Mawarni; Obhrai, Charlotte; Knight, Julie-Ann Marie (Peer reviewed; Journal article, 2019)Even though it is widely known that unstable atmospheric stability conditions can lead to higher turbulence, the use of proper turbulent wind models considering unstable conditions are not often used in the simulation of ... -
Optimization of marine operations for the assembly and installation of a new floating wind concept
Jodar Hernandez, Pol (Master thesis, 2023)The assembly and installation phases are relevant stages in the whole process of the life of a floating offshore wind turbine. Currently, there are multiple competing concepts aiming to make a significant impact in the ... -
Optimizing the installation process for future FOW developments in Europe, using Shoreline
Skår, Martin (Master thesis, 2021)The increasing interest and demand for renewable energy in Europe have supported trials and developments of floating offshore wind turbines in deep waters. It is already well established that about 80% of Europe's potential ...