Institutt for marin teknikk
Recent Submissions
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On the numerical stability in dynamical distributed simulations
(Journal article; Peer reviewed, 2019)This work takes aim at studying numerical stability in distributed simulations through dynamic stabilityand stability criteria for explicit solvers. This is done by studying outer stability limits, for example stabilityconditions ... -
Method for Real-Time Hybrid Model Testing of Ocean Structures - Case Study on Slender Marine Systems
(Doctoral theses at NTNU;2019:166, Doctoral thesis, 2019) -
Impact of simulation model fidelity and simulation method on ship operational performance evaluation in sea passage scenarios
(Journal article; Peer reviewed, 2019)In this paper, we present and investigate important factors that influence a vessels fuel consumption during operation and what model fidelity that is required to adequately capture these factors in fuel consumption ... -
Transfer Learning in Underwater Operations
(Journal article, 2019)This paper investigates a method for reducing the reality gap that occurs when applying simulated data in training for vision-based operations in a subsea environment. The distinction in knowledge in the simulated and real ... -
An efficient approach for ship collision design of reinforced concrete pontoon walls
(Journal article; Peer reviewed, 2019)This paper presents an efficient method for collision design of prestressed concrete pontoon walls. High fidelity finite element models of a container ship bow and a prestressed concrete pontoon wall are first established. ... -
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 ... -
Reliability Analysis of Wake-induced Riser Collision
(Doctoral theses at NTNU;2019:91, Doctoral thesis, 2019)Reliability-based design of a riser array requires accurate estimation of extremes of the stochastic relative motion process between pairs of risers in order to avoid collision. Hydrodynamic interference is considered to ... -
Path Following Control of Underactuated Surface Vessels in the Presence of Multiple Disturbances
(Chapter, 2019)An integral version of the line-of-sight guidance method is shown to compensate for both kinematic and dynamic disturbances generated by wind, waves and sea currents. The guidance law is designed for path following tasks ... -
Improving pre-turbine SCR systems in marine two stroke diesel engines using hybrid turbocharging: a numerical study of SCR operation range and system fuel efficiency
(Journal article; Peer reviewed, 2019)In this article, a performance evaluation of a novel system solution combining a hybrid turbocharger and a pre-turbine selective catalytic NOx reduction system is carried out. Pre-turbine selective catalytic system are ... -
Safety in Norwegian Fish Farming - Concepts and methods for improvement
(Doctoral theses at NTNU;2019:75, Doctoral thesis, 2019) -
Two-way coupled fluid-structure interaction of gas-liquid slug flow in a flexible riser: Small-scale experiments and simulations
(Journal article; Peer reviewed, 2019)Flexible risers might be subjected to large pressure and density fluctuations when transporting multiphase mixtures as different flow patterns may take place. Those fluctuations might induce large forces on the structure, ... -
Simulating fundamental and higher harmonic VIV of slender structures
(Journal article; Peer reviewed, 2019)Vortex-induced vibrations (VIV) of slender marine structures are complicated response processes, where a number of distinct frequency components might be simultaneously active. These are categorized as fundamental and ... -
Compact models for adaptive sampling in marine robotics
(Journal article; Peer reviewed, 2019)Finding high-value locations for in situ data collection is of substantial importance in ocean science, where diverse bio-physical processes interact to create dynamically evolving phenomena. These cover a variable spatial ... -
The Importance of Friction Reduction in Boundary Layers
(Master thesis, 2019)The modification of boundary layers for the purpose of drag reduction and overall propulsive efficiency for marine vehicles is an interesting concept, one which has been studied through swimming fish, which can alter the ... -
A numerical study on vortex-induced vibrations and the effect of slurry density variations on fatigue of ocean mining risers
(Journal article; Peer reviewed, 2019)Ocean mining emerges as a way of meeting future demands for valuable minerals. Risers conveying ore from the seabed to the surface must withstand large wave and current loads. In addition, vortex-induced vibrations (VIV) ... -
MARSTRUCT benchmark study on nonlinear FE simulation of an experiment of an indenter impact with a ship side-shell structure
(Journal article; Peer reviewed, 2018)This paper presents a benchmark study on collision simulations that was initiated by the MARSTRUCT Virtual Institute. The objective was to compare assumptions, finite element models, modelling techniques and experiences ... -
Prediction of short-term wind and wave conditions for marine operations using a multi-step-ahead decomposition-ANFIS model and quantification of its uncertainty
(Journal article; Peer reviewed, 2019)Short-term predictions of wind and wave properties with a duration of 1–3 days are vital for decision-making during the execution of marine operations. One-step-ahead weather conditions can be accurately predicted via ... -
Large floating structure with free-floating, self-stabilizing tanks for hydrocarbon storage
(Journal article; Peer reviewed, 2019)Hydrocarbon is a major source of energy for sustainable development. Storage of hydrocarbon products, however, requires a significant amount of land space to land-scarce countries like Singapore. This paper presents an ... -
Severe Wave-Body Interactions: a Potential-Flow HPC Method and its Strong Domain-Decomposition Coupling with a Level-Set Navier-Stokes Solver
(Chapter, 2019)The main objective of our ongoing research is to investigate wave loads on and motions of floating bodies in steep waves. For modelling non-linear water-wave and wave-body interaction problems, researchers can use two main ...
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