Browsing NTNU Open by Author "Greco, Marilena"
Now showing items 21-40 of 78
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Foil Motion Control av høyhastighetskatamaraner
Håberg, Ida Oline (Master thesis, 2019)Skip som opererer ved høye hastigheter utsettes regelmessig for kraftige bølgeinduserte belastninger og vibrasjoner forårsaket av store bevegelser og akselerasjoner. Et neddykket foilsystem kombinert med en kontrollalgoritme ... -
Free-Surface Tracking in 2D with the Harmonic Polynomial Cell Method: Two Alternative Strategies
Hanssen, Finn Christian W.; Bardazzi, Andrea; Lugni, Claudio; Greco, Marilena (Journal article, 2017)Several cases of nonlinear-wave propagation are studied numerically in two dimensions within the framework of potential flow. The Laplace equation is solved with the Harmonic Polynomial cell (HPC) method, which is a field ... -
Gas cavity-body interactions: Efficient numerical solution
Colicchio, Giuseppina; Greco, Marilena; Faltinsen, Odd Magnus; Brocchini, Maurizio (Journal article; Peer reviewed, 2015)The paper investigates the interactions occurring between a gas cavity, the surrounding liquid and the nearby structures. In more detail, focus is in the characterization of the various dynamical phases (e.g. “acoustic ... -
Global Analysis of a Floating Bridge
Pedersen, Christopher S (Master thesis, 2013)There is an ongoing political debate in Norway concerning how to improve the communication between communities on the western coastline. A proposed solution is to build floating bridges over some of the crossings that today ... -
Green-water phenomena for feed barges in exposed sea areas
Williams, David Hugh (Master thesis, 2017)Because of high growth in the aquaculture industry, the feeding barges are moving out to more exposed areas. This brings problems such as water on deck. In this master thesis, a shallow water equation code has been constructed ... -
Halvt nedsenkbar tørrtre plattform: Koblingen mellom det hydro-pneumatiske stigerørsstrekk-systemet, stigerørene og kjølen.
Falk, Marianne-Isabelle; Skorpen, Thomas (Master thesis, 2012)Det hydro-pneumatiske strekksystemet til stigerørene virker som en passiv hivkompensator med en olje/gass-akkumulator for a utligne de relative bevegelsene mellom semien og stigerørene. Semiresponsen fører direkte til at ... -
Higher Order Spectral method for wave scenarios with nonlinear and dispersive effects
Lawrence, Christopher (Master thesis, 2018)For ocean application, a High Order Spectral (HOS) method is studied. Different from most application of HOS method which use initial value problem to investigate the spectrum evolution, embedded wave generation is implemented ... -
Hydro-plastic response of beams and stiffened panels subjected to extreme water slamming at small impact angles, Part I: An analytical solution
Yu, Zhaolong; Amdahl, Jørgen; Greco, Marilena; Xu, Hui-li (Journal article; Peer reviewed, 2019)Water impact (slamming) is a strongly nonlinear phenomenon including significant fluid structure interactions. In the case of slamming with a small impact angle between the structure and water, the coupling between ... -
Hydro-plastic response of beams and stiffened panels subjected to extreme water slamming at small impact angles, Part II: Numerical verification and analysis
Yu, Zhaolong; Amdahl, Jørgen; Greco, Marilena; Xu, Hui-li (Journal article; Peer reviewed, 2019)An analytical model has been proposed for the response of beams and stiffened panels subjected to extreme flat or nearly flat water impacts in Part I of the two-part companion paper. The model aims to capture the significant ... -
Hydrodynamic and structural aspects of ship collisions
Yu, Zhaolong (Doctoral theses at NTNU;2017:250, Doctoral thesis, 2017)Ships and offshore installations operating at sea are exposed to the risk of collision accidents, which may cause severe consequences. It is therefore crucial to understand the physics of the collision process and to design ... -
Hydrodynamic effects regarding free-fall lifeboat for compressible air in CFD simulations
Svendsen, Andreas Grung (Master thesis, 2017)Free falling lifeboats are often used as a last resort evacuation system for fixed or floating offshore installations. Lifeboats are normally resting at a skid which is mounted at the mother vessel, until the hook holding ... -
Hydrodynamic effects relevant for free-falling lifeboats in wave conditions
Netland, Vegard (Master thesis, 2017)A free- falling lifeboat is a last resort evacuation system, installed on many rigid and floating offshore structures. The diving process of a free-falling lifeboat is a complex matter, as the external forces varies through ... -
Hydrodynamisk studie av flytende vindturbiner i ekstreme forhold
Vangdal, Cecilie (Master thesis, 2019)En økende etterspørsel etter fornybare energiressurser har støttet opp under nye studier og videre utvikling av offshore flytende vindturbiner på dypt vann. Utfordringer knyttet til denne teknologien er sterk vind og høye ... -
Hydroelastic behaviour of a structure exposed to an underwater explosion
Colicchio, Giuseppina; Greco, Marilena; Brocchini, Maurizio; Faltinsen, Odd Magnus (Journal article; Peer reviewed, 2015)The hydroelastic interaction between an underwater explosion and an elastic plate is investigated num- erically through a domain-decomposition strategy. The three-dimensional features of the problem require a large ... -
Hydroelastic response of a submerged structure to an underwater explosion
Colicchio, Giuseppina; Greco, Marilena; Faltinsen, Odd Magnus (Chapter, 2014)The use of composite structures in offshore engineering has revamped the problem of Fluid Structure Interaction (FSI) during underwater blasts because they enhance the FSI effect and increase the shock resistance of ... -
Implementation of Linear Potential-Flow Theory in the 6DOF Coupled Simulation of Ship Collision and Grounding Accidents
Yu, Zhaolong; Shen, Yugao; Amdahl, Jørgen; Greco, Marilena (Journal article, 2016)Ship collisions and groundings are highly nonlinear and transient, coupled dynamic processes involving large structural deformations and fluid structure interactions. It has long been difficult to include all effects in ... -
Improved HPC method for nonlinear wave tank
Zhou, Wenbo; Greco, Marilena; Shao, Yanlin (Journal article; Peer reviewed, 2017)The recently developed Harmonic Polynomial Cell (HPC) method has been proved to be a promising choice for solving potential-flow Boundary Value Problem (BVP). In this paper, a flux method is proposed to consistently deal ... -
Influence of motion coupling and nonlinear effects on parametric roll for a floating production storage and offloading platform
Greco, Marilena; Lugni, Claudio; Faltinsen, Odd Magnus (Journal article; Peer reviewed, 2015)Occurrence and features of parametric roll (PR) on a weather-vaning floating production storage and offloading (FPSO) platform with a turret single-point mooring-line system are examined. The main focus is on the relevance ... -
Influence of yaw-roll coupling on the behavior of a FPSO: An experimental and numerical investigation
Lugni, Claudio; Greco, Marilena; Faltinsen, Odd Magnus (Journal article; Peer reviewed, 2015)An inconvenience in the experimental set-up of a FPSO in regular waves highlighted occurrence of parametric-roll events promoted by yaw-roll coupling and motivated a combined physical and numerical analysis on the relevance ... -
Installation of large subsea structures - Lowering of suction anchors through the splash zone
Bertelsen, Torleif Ølund (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 ...