Browsing Institutt for marin teknikk by Subject "Marin teknikk, Marin hydrodynamikk"
Now showing items 41-60 of 95
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Importance of Fluid-Structure Interaction on Dropped Lifeboats - A parametric study used to explore the importance of hydroelasticity on complex low rigidity structures using decision factors
(Master thesis, 2015)Experimental methods have previously been used in the design of lifeboats; this approach is both time-consuming and expensive. The experimental approach is suitable to find the loads and accelerations on an existing design; ... -
Including the Effect of Shielding in Prediction of Weather Window for Offshore Lifting Operations
(Master thesis, 2015)The offshore industry is constantly seeking to operate in more extreme conditions. DeepOcean is a subsea service company, where offshore lifts is a part of every day operations. To remain competitive, it is important to ... -
Influence of a Wavefoil on the Wave Pattern Resistance of a Ship
(Master thesis, 2018)The Reynolds-averaged Navier-Stokes equation has been numerically solved in order to study the interaction between the steady wave patterns of a wavefoil and ship hull, using the open source software OpenFOAM. Turbulence ... -
Installation of large subsea structures - Lowering of suction anchors through the splash zone
(Master thesis, 2014)In this thesis the dynamic air cushion pressure inside suction anchors during low- ering through the splash zone has been studied. A non-linear continuity equation for the air mass is used to establish a theoretical model ... -
Investigation of Hydrodynamic Performance of a Twin-Screw Trawler Using CFD
(Master thesis, 2015)Previously experimental methods or empirical knowledge laid the foundation for ship design. Performing a model test in a towing tank is time consuming and expensive. In addition to this, studying detailed effects in a ... -
Investigation of Moonpool Resonance as Vessel Damping Device
(Master thesis, 2016)The starting point of this thesis is to introduce the potential and the viscous flow formulations of a two-dimensional moonpool geometry, and the viscous approach demonstrates compliance with physical experiments. The ... -
Investigation of Roll Damping on an FPSO with Sponsons and Bilge Keels
(Master thesis, 2017)Within Hydrodynamics, estimating the roll damping are associated with difficulties and uncertainty. This is due to roll motion being highly non-linear compared to other degrees of freedom. The non-linearity arises from ... -
Investigation of Sloshing Inside Closed Aquaculture Plants
(Master thesis, 2017)This thesis concerns the sloshing effect inside closed fish farm plants exposed to external waves. To investigate the sloshing phenomenon, linear potential theory together with linear modal theory was implemented, and a ... -
Investigation of thrust loss due to steering while trawling
(Master thesis, 2017)This thesis investigates the potential for a reduction in required propeller power by optimizing the transverse position of attachment points for trawl warps, simulating a system of movable trawl blocks. Full scale ... -
Kombinert Wind- og Bølgekraft
(Master thesis, 2015)I denne master oppgaven ble muligheten for å kombinere vind- og bølgekraft undersøkt. Det er blitt utført et litteraturstudie på ulike konsepter av vindkraft, bølgekraft og kombinert vind- og bølgekraft. Basert på den ... -
Mooring System Design for a Large Floating Wind Turbine in Shallow Water
(Master thesis, 2018)Offshore wind turbines having a semi-submersible sub-structure have been suggested as a good solution at shallow water depths due to its small draft. One of the challenges of having a semi-submersible wind turbine in shallow ... -
The Motion of Slender, Cylindrical Bodies - An Experimental and Theoretical Investigation
(Master thesis, 2018)An accidentally dropped object in the sea can result in critical damage on pipelines, platform base structures and underwater installations. This has to be accounted for during offshore operations and installations. Earlier ... -
Non-linear time domain analysis of vortex induced vibrations
(Master thesis, 2015)In this thesis a model for nonlinear analysis of vortex induced vibrations (VIV), applied to free spanning pipelines, is proposed. The developed model takes into account the soil-pipe interaction. Through case studies, ... -
Nonlinear Wave Loads on a Vertical Cylinder
(Master thesis, 2018)Several authors have indicated discrepancies in the third load harmonic obtained by the inviscid FNV theory for computing higher order wave loads on vertical, non-moving, surface-piercing circular cylinders. The present ... -
Numerical investigation of flow around straight cylinders with inclination
(Master thesis, 2016)In this master thesis the validity of the independence principle(I.P) on an inclined infinite circular cylinder has been investigated. Normalized Reynolds numbers 150 and 1000 for inclination angles 0°-65° were studied. ... -
Numerical Investigation of Viscous Flow Around Two Tandem Circular Cylinders Ending on a Flat Plate
(Master thesis, 2018)Flow around cylindrical shapes are frequently seen both within the academics and for applications in ocean and marine engineering. Viscous flow around tandem cylinders fixed to a vertical wall is numerically simulated for ... -
Numerical Simulation of Flow Around a Prolate Spheroid
(Master thesis, 2017)The concept of closed containment fish cages is promising when coping with sea lice and escaped fish challenges in the aquaculture industry. Unlike the traditional open net cages, the external flow caused by current and ... -
NUMERICAL SIMULATION OF FLOW AROUND TWO SIDE-BY-SIDE RECTANGULAR CYLINDERS WITH VERTICAL AND HORIZONTAL OFFSETS
(Master thesis, 2015)Computational Fluid Dynamics (CFD) is a common tool when investigating the effects of flow around structures. In this thesis, I have used \textit{ANSYS ICEM CFD} (Analysis System Integrated Computer Engineering and ... -
Numerical simulation of viscous flow around a step cylinder
(Master thesis, 2018)Flow around a step cylinder at was investigated numerically with a diameter ratio of $D/d=2$ and Reynolds number $Re_D=600$. The open source software OpenFoam was used for the numerical simulations. The primary focus in ... -
Numerical Simulation of Viscous Flow Past A Curved Cylinder
(Master thesis, 2018)In the present Master thesis three-dimensional viscous flow simulations of flow past a curved circular cylinder is investigated by utilization of the open source Computational Fluid Dynamics (CFD) code OpenFOAM. The focus ...