Browsing UiS Brage by Title
Now showing items 2369-2388 of 18575
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Cfd analysis of low frequency oscillations in Newtonian and non-Newtonian fluids in a vertical pipe
(Peer reviewed; Journal article, 2019)The effect of vertically imposed, low frequency oscillations on the rheology of shear-thinning non- Newtonian fluids are studied numerically by computational fluid dynamics (CFD). Both Newtonian (water) and inelastic ... -
CFD analysis of subsea pipelines and risers.
(Master thesis, 2021)In the master's thesis, an analysis of promising shelf areas in Russia is given for the need to introduce riser systems. The main risers types used in the oil and gas industry are described. The global tasks in work are ... -
CFD analysis of temperature development due to flow restriction in pipeline
(Masteroppgave/UIS-TN-IKM/2015;, Master thesis, 2015-05-29)If the pressure difference in a pipe, up- and downstream of a restriction orifice, is above a critical value, the flow becomes choked and an under-expanded jet occurs. For very large pressure differences, the gas experiences ... -
CFD Analysis of Topographically Induced Turbulence and its Effect on a Fatigue Life Analysis of a Wind Turbine Yaw Gear
(Masteroppgave/UIS-TN-IMBM/2019;, Master thesis, 2019-06)This master's thesis describes a case study of a turbine farm, where the topography and its effect on turbulence is compared to a fatigue life analysis. -
CFD investigation of blind-tee effects on flow mixing mechanism in subsea pipelines
(Peer reviewed; Journal article, 2022)Blind tees are widely used in subsea pipelines to enhance the mixing conditions of oil and gas products, but their structural design still relies on experience. In this paper, a series of numerical investigations have been ... -
CFD investigation of flow through an orifice inside a pipe
(Masteroppgave/UIS-TN-IMBM/2019;, Master thesis, 2019-06-14)Flow measurement is found in a large variety of industries and for different types of fluids. Orifice flow meters are widely used for measuring the flow rate in pipelines due to its small size in the piping system and ... -
CFD investigation of fluid flow within elbow pipes
(Master thesis, 2021)Elbow pipes are crucial parts of many fluid transport systems, including ones used in the oil and gas industry. The curved shape of such pipes induces centrifugal forces on the internal flow, ultimately affecting the flow ... -
CFD Investigation on Hydrodynamic Resistance of a Novel Subsea Shuttle Tanker
(Peer reviewed; Journal article, 2021-12)The Subsea Shuttle Tanker (SST) was proposed by Equinor as an alternative to subsea pipelines and surface tankers for the transportation of liquid carbon dioxide (CO2) from existing offshore/land facilities to marginal ... -
CFD investigation on scour beneath different configurations of piggyback pipelines under steady current flow
(Peer reviewed; Journal article, 2022)Scour beneath piggyback pipelines laid on a sandy seabed is numerically investigated by solving two-dimensional (2D) Unsteady Reynolds-averaged Navier-Stokes (URANS) equations. The fluid flow and the sediment transport are ... -
CFD investigations of scour beneath a submarine pipeline with the effect of upward seepage
(Peer reviewed; Journal article, 2020-12)A numerical model of scour beneath subsea structures considering the effect of upward seepage in the seabed is proposed. A small seepage can cause significant changes to the hydrodynamic force on the bed surface and stability ... -
CFD Modelling of Turbulence around Offshore Structure
(Masteroppgave/UIS-TN-IKM/2016;, Master thesis, 2016-06-15)Leakages of methane from the seabed is a common problem for oil companies, and they are held responsible for leakages surrounding the platforms at sea. These leakages has to be monitored in some way, and Stinger Technology ... -
CFD simulation of an offshore air intake and exhaust system
(Master thesis, 2015-06-15)The main purpose is to investigate whether the exhaust gases from an offshore turbine can be rerouted to heat the air entering the turbine system, thus keeping air humidity concentration above acceptable levels. To ensure ... -
CFD simulation of the flow over a 2-dimensional pipe and vortex induced vibration of the pipe with 1 degree of freedom
(Masteroppgave/UIS-TN-IKM/2015;, Master thesis, 2015-06-16)The fluid that flows through a pipeline free span can generate vortex shedding around the pipe and triggers Vortex Induced Vibration (VIV). This VIV is a major source of fatigue damage due to dynamic stresses in the pipeline ... -
CFD simulation of wind condition and thermal gradient around an offshore helideck
(Masteroppgave/UIS-TN-IØRP/2013;, Master thesis, 2013-06-13)With the development of offshore deep water fields, helicopter transportation and consequently helicopter deck becomes a vital part of these fields that located far from onshore. To ensure helicopter safe operations, ... -
CFD simulations of a suspension bridge deck for different deck shapes with railings and vortex mitigating devices
(Peer reviewed; Journal article, 2019)Aerodynamic response of a single-box suspension bridge girder is investigated using CFD simulations. The importance of including railings and vortex mitigating devices such as guide vanes and a spoiler in the simulations ... -
CFD simulations of flow around the tandem cylinders close to the seabed
(Masteroppgave/UIS-TN-IKM/2016;, Master thesis, 2016-06-15)CFD is a useful tool for understanding continuum mechanics and analyzing flows, both disturbed and undisturbed. When we analyze flow around cylinders with CFD, we can get numerical results. We have the opportunity to see ... -
CFD Simulations of the Propagation of Free-Surface Waves Past Two Side-By-Side Fixed Squares with a Narrow Gap
(Peer reviewed; Journal article, 2019)Two-dimensional computational fluid dynamics (CFD) simulations are carried out to investigate the gap resonance phenomenon that occurs when free-surface waves travel past twin squares in tandem. The volume of fluid method ... -
CFD simulations of violent breaking wave impacts on a vertical wall using a two-phase compressible solver
(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 ... -
CFD Simulations of Vortex-Induced Vibrations of a Subsea Pipeline Near a Horizontal Plane Wall
(Masteroppgave/UIS-TN-IMBM/2018;, Master thesis, 2018-06)Subsea pipelines, when exposed to free spans, can experience vortex-induced vibrations. This phenomenon was described as a resonance condition occurring when the vortex shedding frequency and the natural frequency of a ... -
CFD Simulations on a partially submerged cylinder under regular waves using OpenFOAM
(Master thesis, 2015-06-15)In this Master Thesis, an overview of the performance and applicability of IHFoam numerical tool to offshore engineering related problems is presented. IHFoam is a recent numerical tool for wave modeling using a Computational ...