Blar i Institutt for marin teknikk på tittel
Viser treff 2286-2305 av 3410
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Numerical study of a novel procedure for installing the tower and Rotor Nacelle Assembly of offshore wind turbines based on the inverted pendulum principle
(Journal article; Peer reviewed, 2017)Current installation costs of offshore wind turbines (OWTs) are high and profit margins in the offshore wind energy sector are low, it is thus necessary to develop installation methods that are more efficient and practical. ... -
Numerical study of a well boat operating at a fish farm in current
(Journal article; Peer reviewed, 2019)Dynamic response of a well boat operating at a fish farm in current is investigated numerically. An objective is to determine the operational conditions of the well boat. In terms of the fish farm, a realistic set-up (with ... -
Numerical study of a well boat operating at a fish farm in long-crested irregular waves and current
(Journal article; Peer reviewed, 2019)The dynamic response of a coupled well boat–fish farm system in irregular long-crested waves and current is analyzed numerically in the time domain. The main purpose is to investigate the influence of the well boat on the ... -
Numerical study of bilge-keel effect on parametric roll and water on deck for an FPSO
(Chapter; Peer reviewed, 2015)This research activity represents the logical continuation of the work documented in [1] and [2] on water on deck and parametric roll for an FPSO in regular waves. Here the same numerical method, based on a domain-decomposition ... -
Numerical study of closed rigid fish cages in waves and comparison with experimental data
(Journal article; Peer reviewed, 2021)Closed fish cages have gained increased interest in marine aquaculture. However, knowledge on the seakeeping behaviour of a floating closed cage and the influence of the contained water inside the cage are still limited. ... -
Numerical study of ice-induced loads and responses of a monopile-type offshore wind turbine in parked and operating conditions
(Journal article; Peer reviewed, 2016)Offshore wind is an attractive source of renewable energy. In regions with cold climates, such as Canada, the Baltic Sea, and Bohai Bay, a good understanding of ice loads is essential to design a reliable and cost effective ... -
Numerical Study of Nonlinear Effects for the Wave-Induced Drift Loads on an FPSO
(Master thesis, 2020)Hovedmålet med denne oppgaven var å undersøke viktigheten av ikke-lineære interaksjonseffekter mellom bølger og skip for driftskreftene på en FPSO i bølger i tre dimensjoner, med fokus på de midlere driftkreftene. Denne ... -
Numerical Study of Parametric Roll on a Fishing Vessel
(Chapter; Peer reviewed, 2013)Present research activity examines numerically the occurrence of parametric roll on a fishing vessel interacting with regular head-sea waves. The adopted solver is an efficient 3-D numerical Domain-Decomposition strategy ... -
Numerical Study of Potential and Viscous, Nonlinear, Effects for Wave Drift Loads on Offshore Structures
(Master thesis, 2022)Flytende offshore konstruksjoner utsatt for miljøbelastninger er ofte forankret for å kontrollere posisjonen til konstruksjonen. Forankringen må ta høyde for bølgelaster, da spesielt bølgedriftsbelastninger, før konstruksjonen ... -
Numerical Study of Seabed Boundary Layer Flow around Monopile and Gravity-based Wind Turbine Foundations
(Master thesis, 2015)Computational fluid dynamics (CFD) has been used to study the boundary layer flow around three different bottom-fixed offshore wind turbine foundation designs. Two of the designs are gravity-based foundations, where one ... -
A numerical study of separation and stagnation points for steady and unsteady flow over an elliptic cylinder near a moving wall
(Peer reviewed; Journal article, 2021)Flow separation around an elliptic cylinder with an aspect ratio of 0.4 near a moving wall is investigated numerically for Re 2 ½5; 150 with G=D 2 ½0:1; 2 (where G denotes the distance between the cylinder bottom and the ... -
Numerical Study of the Interaction between Level Ice and Wind Turbine Tower for Estimation of Ice Crushing Loads on Structure
(Journal article; Peer reviewed, 2019)In this paper, the interaction between level ice and wind turbine tower is simulated by the explicit nonlinear code LS-DYNA. The isotropic elasto-plastic material model is used for the level ice, in which ice crushing ... -
Numerical Study on a Floating Wind Turbine in Intermediate Depth
(Master thesis, 2017)Floating wind turbines are considered to be a promising source for renewable energy. Offshore wind power production is moving towards larger turbines and deeper water, and FWT's can unlock areas of rich wind resources ... -
Numerical Study on Aerodynamic Damping of Floating Vertical Axis Wind Turbines
(Journal article; Peer reviewed, 2016)Harvesting offshore wind energy resources using floating vertical axis wind turbines (VAWTs) has attracted an increasing interest in recent years. Due to its potential impact on fatigue damage, the aerodynamic damping ... -
Numerical study on buckling of aluminum extruded panels considering welding effects
(Peer reviewed; Journal article, 2022)Aluminum extruded panels are increasingly used in marine structures as lightweight solutions. Less welding is needed for such extrusions than traditional built-up panels of welding stiffener to plate sheets. However, the ... -
Numerical Study on Offshore Wind Turbine Blade Installation by Utilizing a Floating Vessel
(Master thesis, 2021)Når vindturbininstallasjoner til havs beveger seg mot dypere vann, blir det mer utfordrende for det konvensjonelle oppjekkningsfartøyet å utføre installasjonene. Flytende fartøy kan utføre operasjoner uavhengig av dybde, ... -
Numerical study on roll damping, relevant for FPSO platforms
(Master thesis, 2019)Et fartøys bevegelser beskrives med seks frihetsgrader. Fem av disse kan estimeres ganske bra ved bruk av lineær potensialteori. Rulling kan imidlertid ikke forutsis nøyaktig ved bruk av potensialteori, da denne bevegelsen ... -
Numerical Study on the Dynamic Response of a Submerged Floating Tunnel Under Current Loads Based on the Segment Model Towing Test Results
(Chapter, 2020)Submerged floating tunnels (SFTs) are considered as one of the relevant concepts to replace ferry connection in the Norwegian Public Road Administration's plan to upgrade the E39 coastal highway. Current load including ... -
Numerical study on the feasibility of offshore single blade installation by floating crane vessels
(Journal article; Peer reviewed, 2019)Compared with jack-up crane vessels that are now widely used in offshore wind turbine installation, floating crane vessels are more flexible with respect to working water depth and are much faster in relocation. They are ... -
Numerical study on the heading misalignment and current velocity reduction of a vessel-shaped offshore fish farm
(Peer reviewed; Journal article, 2019)Recently, the concept of a vessel-shaped fish farm was proposed for open sea applications. The fish farm comprises a vessel-shaped floater, five fish cages, and a single-point mooring system. Such a system weathervanes, ...