Browsing Faculty of Science and Technology by Title
Now showing items 4482-4501 of 7049
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Numerical simulation of temperature-dependent flow dynamics in drilling operations
(Masteroppgave/UIS-TN-IEP/2019;, Master thesis, 2019-06-15)This thesis is a description of the research and improvements on solving hyperbolic conservation laws by defining a hybrid explicit/implicit numerical scheme. Former researches have been done by (Evje and Flåtten 2005) on ... -
Numerical simulation of underexpanded air jet using OpenFOAM
(Masteroppgave/UIS-TN-IØRP/2015;, Master thesis, 2015-06-15)It is of utmost importance for the awareness of safety issues involved in high pressure gas storage to perceive the adjacent field of high pressure gas jet release for the establishment of the decomposition laws in the far ... -
Numerical Simulation of VIV of Risers with Staggered Buoyancy Elements
(Masteroppgave/UIS-TN-IKM/2016;, Master thesis, 2016-06-15)Steel Lazy Wave Riser (SLWR) is an attractive deep water riser system design, which allows the platform motion to be decoupled from the touchdown point (TDP) of the riser. When subjected to external flow, both buoyancy ... -
Numerical simulation-based effect characterization and design Optimization of micro cross-flow turbine
(Peer reviewed; Journal article, 2019)In this era of high power demand along with a need for sustainability, small and micro-scale hydro turbines are indispensable, especially for off-grid power generation. These hydro-turbines are more appealing, particularly ... -
Numerical simulations of flow around two tandem wall-mounted structures at high Reynolds numbers
(Peer reviewed; Journal article, 2020)In the present study, the flow around two-dimensional (2D) square and trapezoidal wall- mounted structures in tandem on a horizontal flat wall has been simulated using two-dimensional Reynolds-averaged Navier-Stokes (RANS) ... -
Numerical Simulations of Flow Over Bottom-Mounted Structures at High Reynolds Number
(Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2019-06)A common challenge in on-bottom stability design is to select accurate hydrodynamic quantities, such as drag and lift coefficients, to compute the forces on structures subject to fluid flow. The objective of the present ... -
Numerical simulations of flow-induced vibrations of two rigidly coupled cylinders with uneven diameters in the upper transition Reynolds number regime
(Peer reviewed; Journal article, 2021)Two degree-of-freedom (2-DoF) flow-induced vibrations (FIV) of two rigidly coupled cylinders are numerically investigated at the Reynolds number of 3.6 × 106. Two- dimensional (2D) Unsteady Reynolds-Averaged Navier–Stokes ... -
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 ...