Browsing Institutt for marin teknikk by Title
Now showing items 3143-3162 of 3437
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A Three-Dimensional Model for Strength Assessment of Type-C Independent Cargo Tank Structures
(Peer reviewed; Journal article, 2020)For the analysis of the arrangement and strength of Type-C independent cargo tank structures, the linear spring or rod elements are usually used to model supporting woods, in which one-dimensional and linear contact behaviors ... -
Three-dimensional numerical modeling of local scour around a non-slender cylinder under varying wave conditions
(Chapter, 2015)The three-dimensional numerical model REEF3D is used to simulate the detailed flow field and sediment transport around a non-slender cylinder under regular waves. The location of the free surface is calculated with the ... -
Three-dimensional numerical modelling of wave-induced scour around piles in a side-by-side arrangement
(Journal article; Peer reviewed, 2018)The paper presents the numerical modelling of wave-induced scour around piles in a side-by-side arrangement using the open-source CFD model REEF3D. The model solves the Reynolds-Averaged Navier-Stokes equations to calculate ... -
Three-dimensional numerical modelling of wave-induced scour around piles in a side-by-side arrangement
(Journal article; Peer reviewed, 2018) -
Three-Dimensional Path Planning of Deep-Sea Mining Vehicle Based on Improved Particle Swarm Optimization
(Peer reviewed; Journal article, 2023)Three-dimensional path planning is instrumental in path decision making and obstacle avoidance for deep-sea mining vehicles (DSMV). However, conventional particle swarm algorithms have been prone to trapping in local optima ... -
Three-dimensional streaming in sea bed boundary layer
(Doctoral theses at NTNU;2017:62, Doctoral thesis, 2017)The objective of the work carried out in the present thesis is to obtain new insights into wave- current seabed boundary layers by studying the wave-current interaction for the general case of a non-zero angle between the ... -
Three-dimensional wake transition behind an elliptic cylinder near a moving wall
(Peer reviewed; Journal article, 2021)In this work, the flow over an elliptic cylinder near a moving wall is investigated for Reynolds numbers less than 150. Here, the ratio between the gap (i.e., the distance between the cylinder and the wall) and the length ... -
Thrust Allocation with Dynamic Power Consumption Modulation for Diesel-Electric Ships
(Journal article; Peer reviewed, 2016)Modern ships and offshore units built for dynamic positioning (DP) are often powered by an electric power plant consisting of two or more diesel-electric generators. Actuation in any desired direction is achieved by placing ... -
Thrust loss due to interaction with ship hull and bottom for ships in shallow waters
(Master thesis, 2022)Målet med denne master avhandlingen er et klart svar på spørsmålet: \emph{Er det en spesifikk effekt, eller kombinasjon av flere som forekommer på grunt vann og forårsaker thrust tap?} Etter et relativt bredt litteratursøk ... -
Thrust loss on azimuthing thrusters due to Coanda effect
(Master thesis, 2010)The main objectives in this master's thesis is to investigate how the Coanda effect influences a thruster jet which further causes a thrust loss. The tendency of a thruster slipstream to be deflected towards a nearby ... -
Thrust Losses on Underwater Snake Robots with Thrusters
(Master thesis, 2017)The main motivation behind this thesis is to study the effects from different thrust losses on an underwater snake robot (USR) with thrusters. In-line velocity fluctuations, transverse velocity fluctuations, thruster-thruster ... -
Thrust Optimisation of an Oscillating Hydrofoil - By Non-Sinusoidal Sway and Yaw Motion
(Master thesis, 2017)Past research has shown that oscillating hydrofoils can enhance the propulsion efficiency significantly compared to traditional propellers. Dynamic stall plays an important role in the thrust generated by an oscillating ... -
Thruster-Assisted Position Mooring of C/S Inocean Cat I Drillship
(Master thesis, 2016)This thesis presents the development of a new research foundation into the Marine Cybernetic Laboratory, the C/S Inocean Cat I Drillship. This is a 1:90 scaled model of an Arctic drillship design by Inocean for Statoil. The ... -
Tidal and Wind Driven Boundary Layer Flow in Coastal Zones
(Master thesis, 2018)The objective with this thesis is to investigate the start-up of a pure wind driven flow, and the effect of an suddenly increasing wind (starting from zero wind speed) on a tidally driven flow. This is done by performing ... -
Tidal Boundary Layer Flow in Coastal Zones
(Master thesis, 2015)A one-dimensional hydrodynamic model with a two-equation turbulence closure has been used to model shallow-water tidal flow over a complex bottom. The intention was to investigate the applicability of the model on tidal ... -
Tidal boundary layer flow over a flat bottom with vegetation
(Master thesis, 2016)A numerical k-epsilon model has been modified to account for the presence of submerged vegetation. The code has been successfully validated and run against tidal current measurement. The results looks promising. Especially ... -
Tilstandsbasert vedlikehold på tørrgasstetninger
(Master thesis, 2014)Tørrgasstetninger er mekaniske akseltetninger som er plassert på hver sin side av kompressorhuset for å hindre at gass lekker ut til omgivelsene. Tørrgasstetninger benytter gass som tetningsmedium. Gasslekkasje kontrolleres ... -
Time Domain Analysis of Vortex-Induced Vibrations
(Doctoral thesis at NTNU;2016:231, Doctoral thesis, 2016)This thesis deals with the development of a new empirical model of the hydrodynamic loads associated with vortex-induced vibrations (VIV) of slender circular cylinders. The most commonly used VIV analysis tools operate in ... -
Time domain analysis procedures for fatigue assessment of a semi-submersible wind turbine
(Journal article; Peer reviewed, 2015)Long term time domain analysis of the nominal stress for fatigue as- sessment of the tower and platform members of a three-column semi- submersible was performed by fully coupled time domain analyses in Simo- Ri ex-AeroDyn. ... -
Time domain model for calculation of pure in-line vortex-induced vibrations
(Journal article; Peer reviewed, 2017)A time domain model for prediction of cross-flow vortex-induced vibrations (VIV) of slender structures with circular cross section has been under development since 2012. As an extension of this work, a time domain model ...