Browsing NTNU Open by Author "Greco, Marilena"
Now showing items 21-40 of 67
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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 ... -
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 equationfor the air mass is used to establish a theoretical model ... -
Investigation of Parametric Resonance in Roll for Container Carrier Ships
Ghamari, Isar; Faltinsen, Odd Magnus; Greco, Marilena (Chapter; Peer reviewed, 2015)Parametric roll resonance is of concern for container and fishing vessels, especially in head-sea waves. Here this phenomenon is investigated with a numerical method based on potential-flow theory with viscous corrections ... -
Local and Global Properties of the Harmonic Polynomial Cell Method: In-depth Analysis in Two Dimensions
Ma, Shaojun; Hanssen, Finn Christian W.; Siddiqui, Mohd Atif; Greco, Marilena; Faltinsen, Odd Magnus (Journal article, 2017)A detailed and systematic analysis is performed on the local and global properties of the recently developed Harmonic Polynomial Cell (HPC) method, a very accurate and efficient field solver for problems governed by the ... -
Lowering and lifting operations through moonpools: Hydrodynamic investigations
Håland, Sigve (Master thesis, 2014)On construction vessels subsea modules, diving bells, cables and so on are often lifted through a moonpool. The advantage of using a moonpool is that the surface elevation inside the moonpool is shielded against the outside ... -
Non-Linear Wave-Body Interaction in Severe Waves
Hanssen, Finn-Christian Wickmann (Doctoral theses at NTNU;2019:173, Doctoral thesis, 2019)Offshore structures located in harsh environments may experience large wave loads and wave-induced responses. The present thesis documents a twodimensional numerical investigation of interactions between fixed or floating ... -
Nonlinear Hydrodynamic Effects for Bottom-Fixed Wind Turbines
Rosenlund, Even (Master thesis, 2013)This master thesis investigates possible effects from nonlinear wave loading onbottom fixed offshore wind turbines. The resonant phenomena springing andringing are reviewed with focus on their cause, and their possible ...