Browsing UiS Brage by Title
Now showing items 12161-12180 of 18886
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Numerical simulations of gas-liquid two-phase flow induced forces on 90-degere elbow structures
(Master thesis, 2023)90-degree elbow structures such as pipelines with bends and rigid jumpers, are commonly used for flow transportation in subsea systems. The produced flow from the subsea wells is normally a multiphase flow which is a mixture ... -
Numerical Simulations of Near-Wall Vortex-Induced Vibrations of two Circular Cylinders in Tandem
(Masteroppgave/UIS-TN-IMBM/2019;, Master thesis, 2019-06-15)Free-spanning subsea pipelines may experience vortex-induced vibrations (VIV) when exposed to fluid flow. These resonant motions can cause fatigue-related problems and in some cases failure of the pipe. A common configuration ... -
Numerical simulations of the sliding impact between an ice floe and a ship hull structure in ABAQUS
(Peer reviewed; Journal article, 2022)This paper studies the hull structural responses of a steel grillage subjected to sliding ice loads, which have been rarely investigated in the literature. Sliding ice loads are modelled using nonlinear finite element ... -
Numerical Simulations of Turbulent Flow through Piping Systems
(Master thesis, 2022)Piping systems have a wide range of applications across many different industries. Pipelines are essential infrastructure in the offshore oil & gas installations. One of the key challenges when operating complicated piping ... -
Numerical Stress Analysis of Tubular Joints
(Master thesis, 2021) -
Numerical stress analysis of tubular joints
(Peer reviewed; Journal article, 2021)The finite element analysis (FEA) presented in this paper pertains to the stress analysis of both the welded tubular T and X joints and is aimed to assess both the importance of the presence of the weld geometry and the ... -
Numerical study of a concept for major repair and replacement of offshore wind turbine blades
(Peer reviewed; Journal article, 2020-03)Repair and replacement of offshore wind turbine blades are necessary for current and future offshore wind turbines. To date, repair activities are often conducted using huge jack-up crane vessels and by applying a reverse ... -
A numerical study of density-unstable reverse circulation displacement for primary cementing
(Peer reviewed; Journal article, 2022)Primary cementing of the casing string is the operation where the annular space behind the casing is displaced to a cement slurry. Once hardened, the cement should form a solid annular barrier and provide zonal isolation ... -
Numerical Study of Oxygen Transport in Aquaculture Tanks With Different Geometries
(Master thesis, 2022)The transport of dissolved oxygen concentration in water for aquaculture is a core parameter affecting the quality of yielded fish. An emerging shift from offshore to land-based aquaculture presents advan- tages to marine ... -
A Numerical Study of Pressure Build Up due to Kick Migration in a Closed Well Filled with Water-Based Mud
(Masteroppgave/UIS-TN-IEP/2020;, Master thesis, 2020-06-15)There has been considerable and diverging discussion in the academic literature regarding the real gas kick velocity. This thesis contributes to improving and sharing the knowledge about the real gas kick velocity. It is ... -
Numerical study of two typical Norwegian gravity-based fish cages with different cage shapes and weights
(Master thesis, 2021)Fish cages usually have net deformation in marine environments, and this deformation can reduce the cultivation volume of the fish cage and thus reduce the fish welfare. Hence, it is necessary to understand the structural ... -
Numerical study on controller of offshore wind turbine and its effect on turbine loads
(Master thesis, 2021)The primary objective of this thesis is to evaluate the controller behavior of a large-scale wind turbine and investigate how the controller design can affect the fatigue damage for the turbine. In addition, it is interesting ... -
Numerical study on deployment of subsea template using coupled and uncoupled model
(Peer reviewed; Journal article, 2021)This study compares deployment of a subsea template simulated as a coupled model and as an uncoupled model in the time domain simulation software Orcaflex. Defining vessel motion as prescribed simplifies the model and will ... -
Numerical study on gap resonance coupled to vessel motions relevant to side-by-side offloading
(Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-07-13)Floating Liquefied Natural Gas (FLNG) systems are large facilities dealing with offshore storage, processing, and transport of natural gas from the ocean basin. These enormous vessels allow the natural gas to be produced ... -
Numerical Study on Offshore Lifting Operations of a Subsea Spool
(Masteroppgave/UIS-TN-IMBM/2018;, Master thesis, 2018-06)Within the scope of marine operations, offshore lifting operations present significant challenges due to the instability and harshness of environmental conditions. Therefore, lifting operations become expensive and risky. ... -
Numerical study on splash zone crossing with GRP protection cover.
(Master thesis, 2022)For oil and gas fields moving further offshore, it has been more common to use a subsea production system or a combination of rig and subsea structures. These subsea structures must be overtrawlable if they are not marked ... -
Numerical study on splash zone crossing with subsea template and ROV
(Master thesis, 2021)External loads on a free-floating vessel affect the vessel responses in waves. DNV’s recommended practice for modeling and analysis of marine operations [1] categorizes lifting of an object above 1-2% of the vessel ... -
Numerical study on structural responses of gravity-based fish cages
(Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020)The location of a fish farm is moving towards more exposed locations due to spatial and environmental concerns. As the fish farm moves to open seas, the structure of the fish farm would undergo increased environmental loads ... -
Numerical study on the deployment of a subsea template
(Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-06-30)Subsea templates are normally transported to the installation site on the deck of a crane vessel. After being lifted off from the deck, the template is 1) over-boarded from the initial location to the target position by the ... -
Numerical study on thermal effects in an electric subsea robotic actuator
(Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-07-07)A remotely operated vehicle (ROV) is equipped with two robotic manipulators. Current manipulators are hydraulically actuated. The industry has uncovered the potential in replacing hydraulic-based technology with its ...