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Tesi sul tema "Offshore structures – Hydrodynamics"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 4 febbraio 2022

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1

Hodgkinson, Derek Anthony Martin. "Computer graphics applications in offshore hydrodynamics." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26705.

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The results of hydrodynamic analyses of two problems involving offshore structures are displayed graphically. This form of presentation of the results and the liberal use of colour have been found to significantly help the ease in which the results are interpreted. For the transformation of waves around an artificial island, a time history of the evolution of the regular, unidirectional wave field around an artificial island is obtained. Through the use of colour, regions in which wave breaking occurs have been clearly defined. The numerical technique used is based on the finite element metho

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2

Schulz, Karl Wayne. "Numerical prediction of the hydrodynamic loads and motions of offshore structures /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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3

Walker, Daniel Anthony Guy. "Interaction of extreme ocean waves with offshore structures." Thesis, University of Oxford, 2006. http://ora.ox.ac.uk/objects/uuid:6858dc08-1bd4-4195-8893-1af98d5e68e3.

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With most of the world's untouched oil and gas resources offshore and the possibility that hurricanes are becoming more frequent and more intense, the risks associated with offshore oil and gas production are increasing. Therefore, there is an urgent need to improve current understanding of extreme ocean waves and their interaction with structures. This thesis is concerned with the modelling of extreme ocean waves and their diffraction by offshore structures, with the ultimate aim of proposing improved tools for guiding airgap design. The feasibility of using linear and second order diffractio

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4

周奮鵬 and Fun-pang Chau. "Numerical methods in wave loading of large offshore structures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1985. http://hub.hku.hk/bib/B31206797.

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5

Abdolmaleki, Kourosh. "Modelling of wave impact on offshore structures." University of Western Australia. School of Mechanical Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0055.

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[Truncated abstract] The hydrodynamics of wave impact on offshore structures is not well understood. Wave impacts often involve large deformations of water free-surface. Therefore, a wave impact problem is usually combined with a free-surface problem. The complexity is expanded when the body exposed to a wave impact is allowed to move. The nonlinear interactions between a moving body and fluid is a complicated process that has been a dilemma in the engineering design of offshore and coastal structures for a long time. This thesis used experimental and numerical means to develop further underst

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6

Cheung, Kwok Fai. "Hydrodynamic interactions between ice masses and large offshore structures." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26686.

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The objective of the work described in this thesis is to evaluate the significance of the ambient fluid on the motion of an ice mass in the vicinity of an offshore structure and during the subsequent impact mechanism. Models for iceberg drift are first reviewed. The changes in flow field around an ice mass drifting in a current near an offshore structure are investigated by potential flow theory. The proximity effects and current interactions are generalized by introducing the added mass and convective force coefficients for the ice mass. A two-dimensional numerical model based on the boundar

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7

McTaggart, Kevin Andrew. "Hydrodynamics and risk analysis of iceberg impacts with offshore structures." Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/30733.

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The evaluation of design iceberg impact loads for offshore structures and the influence of hydrodynamic effects on impact loads are examined. Important hydrodynamic effects include iceberg added mass, wave-induced oscillatory iceberg motions, and the influence of a large structure on the surrounding flow field and subsequent velocities of approaching icebergs. The significance of these phenomena has been investigated using a two-body numerical diffraction model and through a series of experiments modelling the drift of various sized icebergs driven by waves and currents approaching a large of

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8

Lipsett, Arthur William. "Nonlinear response of structures in regular and random waves." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25826.

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The problem of the dynamics of a flexible offshore structure in either a regular or random sea is considered in this thesis. A simple single degree of freedom model of the structure is assumed and the relative velocity formulation of the Morison equation is used to describe the fluid force. The resulting equation of motion is a nonlinear ordinary differential equation with either harmonic or stochastic forcing depending on the wave description. Solutions are obtained for regular deterministic waves by numerical integration, various linearization methods and a new perturbation method develope

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9

Richardson, Mark Damian. "Dynamically installed anchors for floating offshore structures." University of Western Australia. School of Civil and Resource Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0230.

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The gradual depletion of shallow water hydrocarbon deposits has forced the offshore oil and gas industry to develop reserves in deeper waters. Dynamically installed anchors have been proposed as a cost-effective anchoring solution for floating offshore structures in deep water environments. The rocket or torpedo shaped anchor is released from a designated drop height above the seafloor and allowed to penetrate the seabed via the kinetic energy gained during free-fall and the anchors self weight. Dynamic anchors can be deployed in any water depth and the relatively simple fabrication and insta

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10

Hildebrandt, Arndt [Verfasser]. "Hydrodynamics of breaking waves on offshore wind turbine structures / Arndt Hildebrandt." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2014. http://d-nb.info/1053540329/34.

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11

Nwogu, Okey U. "Wave loads and motions of long structures in directional seas." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25129.

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The effects of wave directionality on the loads and motions of long structures is investigated in this thesis. A numerical method based on Green's theorem is developed to compute the exciting forces and hydrodynamic coefficients due to the interaction of a regular oblique wave train with an infinitely long, semi-immersed floating cylinder of arbitrary shape. Comparisons are made with previous results obtained using other solution techniques. The results obtained from the solution of the oblique wave diffraction problem are used to determine the transfer functions and response amplitude operat

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12

Chau, Fun Pang. "The second order velocity potential for diffraction of waves by fixed offshore structures." Thesis, University College London (University of London), 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296841.

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It is well known that second order effects may in many cases be important for the nonlinear hydrodynamic problems arising in ocean engineering. Despite considerable efforts having been made in the past in calculating second order unsteady forces, similar studies are rare for the actual second order velocity potential itself, which is important for the understanding of wave kinematics. A mathematical model has been developed for the calculation of the second order sum frequency diffraction potential for fixed bodies in waves. It is believed that a first step towards the solution of the second o

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13

Muthedath, Premkumar. "Numerical study of nonlinear free-surface flows." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07212009-040300/.

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14

Duong, Chay N. "A study of new-wave theory and an implementation of the new wave theory into GTSELOS computer program." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/21492.

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15

Tochetto, Luan Grégori 1989. "Estudo experimental de um supressor de vibração PTMD em um modelo reduzido de jumper submerso." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264456.

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Orientador: Sérgio Nascimento Bordalo<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica e Instituto de Geociências<br>Made available in DSpace on 2018-08-23T18:52:37Z (GMT). No. of bitstreams: 1 Tochetto_LuanGregori_M.pdf: 7430018 bytes, checksum: 8523efb2c0601ab21d1e2057f0d7c2af (MD5) Previous issue date: 2013<br>Resumo: Tubulações submarinas, tais como risers e jumpers, sofrem carregamentos estáticos e dinâmicos devido a forças ambientais, correntes marítimas e ondas, carregamentos devido aos deslocamentos da unidade flutuante de produção (plat

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16

Winsor, Fraser N. "Methods for removing inertial force from measured wave impact force signals." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0021/MQ55546.pdf.

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17

Zhou, Hongjie. "Numerical study of geotechnical penetration problems for offshore applications." University of Western Australia. Centre for Offshore Foundation Systems, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0239.

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The research carried out in this thesis has concentrated on the application of numerical solutions to geotechnical penetration problems in offshore engineering. Several important issues closely relevant to deep-water oil and gas developments were investigated, covering installation of suction caisson foundations, interpretation of fullflow penetrometers and shallow penetration of a cylindrical object (submarine pipeline or T-bar), all in clayey sediments such as are often encountered in deep-water sites. These problems are commonly characterised by large vertical movements of structural elemen

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18

Bellezi, Cezar Augusto. "Análise numérica de fenômenos de impacto hidrodinâmico em plataformas offshore." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-23102015-153652/.

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O presente trabalho é focado no estudo dos violentos fenômenos de impacto hidrodinâmico que podem prejudicar a operação de plataformas offshore. São três os fenômenos abordados neste trabalho: o green water, o wave runup e o sloshing. O fenômeno de wave runup consiste na projeção vertical de uma coluna de água devido ao impacto de ondas em estruturas transversais. O fenômeno de green water consiste no embarque de água no convés, podendo danificar os equipamentos da planta de produção. Por fim, o sloshing consiste no movimento violento de fluído em tanques parcialmente preenchidos, resultando e

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19

Motamed, Dashliborun Amir. "Performance of multiphase packed-bed reactors and scrubbers on offshore floating platforms: hydrodynamics, chemical reaction, CFD modeling and simulation." Doctoral thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/30439.

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Les systèmes flottants de production, stockage et de déchargement (FPSO) ont été introduits dans les secteurs d'exploitation des hydrocarbures offshore en tant qu'outils facilement déplaçables pour l’exploitation de champs de pétrole et de gaz de petites ‘a moyenne tailles ou lorsque ceux-ci sont éloignés des côtes ou en eaux profondes. Ces systèmes sont de plus en plus envisagés pour les opérations de traitement et de raffinage des hydrocarbures à proximité des sites d'extraction des réservoirs sous-marins en utilisant des laveurs et des réacteurs à lit fixe embarqués. De nombreuses études da

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20

Santos, Marcus Vinicius Franchi dos 1983. "Um estudo comparativo de dutos em vãos livres através de simulações numéricas." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265806.

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Orientador: Celso Kazuyuki Morooka<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica e Instituto de Geociências<br>Made available in DSpace on 2018-08-27T09:36:46Z (GMT). No. of bitstreams: 1 Santos_MarcusViniciusFranchidos_M.pdf: 2250280 bytes, checksum: 714679541259e76068e17573b7fb74b1 (MD5) Previous issue date: 2015<br>Resumo: Vibrações Induzidas por Vórtices em dutos com vãos livres sujeitos a corrente marítima é um problema presente na indústria offshore. Embora significativos esforços tenham sido feitos para entender este complicado problem

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21

Morris-Thomas, Michael. "An investigation into wave run-up on vertical surface piercing cylinders in monochromatic waves." University of Western Australia. School of Oil and Gas Engineering, 2003. http://theses.library.uwa.edu.au/adt-WU2004.0010.

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[Formulae and special characters can only be approximated here. Please see the pdf version of the abstract for an accurate reproduction.] Wave run-up is the vertical uprush of water when an incident wave impinges on a free- surface penetrating body. For large volume offshore structures the wave run-up on the weather side of the supporting columns is particularly important for air-gap design and ultimately the avoidance of pressure impulse loads on the underside of the deck structure. This investigation focuses on the limitations of conventional wave diffraction theory, where the free-surface

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22

Tsukada, Raphael Issamu 1983. "Comportamento dinamico de riser rigido em catenaria devido a vibração induzida por vortices em aguas profundas." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265457.

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Orientador: Celso Kazuyuki Morooka<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica e Instituto de Geociencias<br>Made available in DSpace on 2018-08-13T09:48:02Z (GMT). No. of bitstreams: 1 Tsukada_RaphaelIssamu_M.pdf: 4706299 bytes, checksum: b217ddb6687b4f89959018a445ff1dee (MD5) Previous issue date: 2009<br>Resumo: O presente trabalho tem como objetivo principal caracterizar o comportamento dinâmico de risers em configuração catenária (SCR) sob os efeitos do fenômeno da vibração induzida por vórtices (VIV). Estes estudos foram realizados atr

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23

Kitney, Neil. "Hydrodynamic loading of catenary mooring lines." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342219.

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24

Murray, Brian A. "Hydrodynamic loading due to appurtenances on jacket structures." Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239242.

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25

Theophanatos, Andreas. "Marine growth and the hydrodynamic loading of offshore structures." Thesis, University of Strathclyde, 1988. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=26411.

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This thesis presents the results of a study on the effects of marine growth on the hydrodynamic loading of offshore structures and proposes an approach that can be adopted by designers and operators to quantify these effects. The approach is based upon the realistic characterisation of marine growth and its temporal variations during the life span of template structures. Past research work and current design, inspection and maintenance practices are critically reviewed and their limitations with respect to marine growth are highlighted. The ecology of marine growth for a sample of North Sea pl

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26

Sarkar, Abhijit. "Dynamics of moored offshore structures in random seas." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284464.

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27

Carstens, Baerbel. "Hydrodynamic forces on cylinders subjected to single and multiple frequency excitation." Thesis, University of Strathclyde, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366670.

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28

Indiyono, Paulus. "Hydrodynamic loading due to appurtenances on offshore structural members." Thesis, University of Newcastle Upon Tyne, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307828.

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29

Zhou, Chao Ying. "Effects of combination motions on cylinders in waves and currents." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339445.

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30

Naghipour, Morteza. "The accuracy of hydrodynamic force prediction for offshore structures and Morison's equation." Thesis, Heriot-Watt University, 1996. http://hdl.handle.net/10399/738.

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31

Caputo, Piermodesto. "Hydrodynamic loading and structural dynamic assessment of offshore concrete lighthouse." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Abstract (sommario):

Historic rock-mounted lighthouses play a vital role in the safe navigation around perilous reefs. Their longevity is threatened by the battering of waves which may be set to increase with climate change. The protection of this historic heritage needs the identification of both structural dynamic parameters (natural frequencies and shape modes), and of the worst-cases wave load combination, able to affect that natural frequencies. This dissertation was developed during a period of five months at University of Plymouth, along with the researching team of the project STORMLAMP. The project is div

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32

Leroy, Vincent. "Aérodynamique instationnaire pour l'analyse de la tenue à la mer des éoliennes flottantes." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0050/document.

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La simulation numérique des éoliennes flottantes est essentielle pour le développement des Energies Marines Renouvelables. Les outils de simulation classiquement utilisés supposent un écoulement stationnaire sur les rotors. Ces théories sont généralement assez précises pour calculer les forces aérodynamiques et dimensionner les éoliennes fixes (à terre ou en mer) mais les mouvements de la plateforme d’une éolienne flottante peuvent induire des effets instationnaires conséquents. Ceux-ci peuvent par exemple impacter la force de poussée sur le rotor. Cette thèse de doctorat cherche à comprendre

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33

Kernot, Matthew Peter. "The second-order forcing and response of offshore structures in irregular seas." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306887.

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34

Kim, Yonghwan 1964. "Computation of higher-order hydrodynamic forces on ships and offshore structures in waves." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/79979.

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35

Ercolanelli, Julien. "Étude numérique et expérimentale d'un système couplé stabilisateur et récupérateur d'énergie des vagues Experimental and numerical investigation of sloshing in anti-roll tank using effective gravity angle Experimental and numerical assessment of the performance of a new type passive anti-roll stabilisation system." Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2019. http://www.theses.fr/2019ENTA0008.

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Le développement de Geps Techno est basé sur un concept innovant de structure flottante destinée à produire de l'énergie électrique à partir de plusieurs sources d'énergies marines renouvelables dont la source houlomotrice. Le système houlomoteur développé par Geps Techno repose sur la mise en circulation d'eau et la création d'un tourbillon en son sein. En profitant du phénomène de carène liquide, le concept est également déclinable en un système de stabilisation de navire ou de toute autre plateforme flottante. L'objectif à court terme de la société est le développement de cette technologie

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36

Zhang, Jian. "Hydrodynamic behavior of packed-bed reactors on a floating platform : liquid distribution and drainage dynamics." Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/68634.

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Pour combler l'écart entre l'augmentation de la demande énergétique et l'épuisement de la production d'hydrocarbures onshore, l'exploitation des hydrocarbures offshore est de plus en plus envisagée, en particulier les gisements de gaz / pétrole dans les eaux plus profondes. En attendant, un grand nombre d'unités de traitement déployées pour la production d'hydrocarbures doivent respecter les contraintes environnementales conçues pour la protection maritime. Les systèmes tels que les réacteurs et les épurateurs à lit fixe embarqués deviennent inévitablement l'une des options les plus prometteus

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37

Liou, Sy Yeuan. "Hybrid boundary integral equation method for the hydrodynamic analysis of marine structures in open and confined water." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315619.

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38

Najafian, G. "Local hydrodynamic force coefficients from field data and probabilistic analysis of offshore structures exposed to random wave loading." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317214.

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39

Allsop, Steven Christopher. "Hydrodynamic modelling for structural analysis of tidal stream turbine blades." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/33219.

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The predictable nature of the tides offers a regular, reliable source of renewable energy that can be harnessed using tidal stream turbines (TSTs). The UK's practically extractable tidal stream energy resource has the potential to supply around 7 % of the country's annual electricity demand. As of 2016, the world's first commercial scale arrays have been deployed around the UK and France. The harsh nature of the marine operating environment poses a number of engineering challenges, where the optimal turbine design solution remains under investigation. In this thesis, a numerical model is devel

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40

Cathelain, Marie. "Développement d’un modèle de simulation déterministe pour l’étude du couplage entre un écoulement atmosphérique et un état de mer." Thesis, Ecole centrale de Nantes, 2017. http://www.theses.fr/2017ECDN0001/document.

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La physique de la couche limite atmosphérique en domaine océanique est principalement régie par les processus couplés liés au vent, à l’état de mer local, et à des effets de flottabilité. Leur compréhension reste néanmoins parcellaire et leurs descriptions théoriques et stochastiques sont pour le moins lacunaires, lorsqu’elles ne sont tout simplement pas mises à mal par les rares observations. Dans un contexte d’exploitation croissante de la ressource éolienne offshore, la mise en place de méthodes numériques visant à une description plus fine des propriétés turbulentes de cette couche limite

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41

Scarfe, Bradley Edward. "Oceanographic Considerations for the Management and Protection of Surfing Breaks." The University of Waikato, 2008. http://hdl.handle.net/10289/2668.

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Although the physical characteristics of surfing breaks are well described in the literature, there is little specific research on surfing and coastal management. Such research is required because coastal engineering has had significant impacts to surfing breaks, both positive and negative. Strategic planning and environmental impact assessment methods, a central tenet of integrated coastal zone management (ICZM), are recommended by this thesis to maximise surfing amenities. The research reported here identifies key oceanographic considerations required for ICZM around surfing breaks including

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42

Narayanan, Suchithra. "Experimental analysis of a nonlinear moored structure." Thesis, 1999. http://hdl.handle.net/1957/33527.

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43

King, Paul E. "Deterministic and stochastic control of nonlinear oscillations in ocean structural systems." Thesis, 2006. http://hdl.handle.net/1957/29586.

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Complex oscillations including chaotic motions have been identified in off-shore and submerged mooring systems characterized by nonlinear fluid-structure interactions and restoring forces. In this paper, a means of controlling these nonlinear oscillations is addressed. When applied, the controller is able to drive the system to periodic oscillations of arbitrary periodicity. The controller applies a perturbation to the nonlinear system at prescribed time intervals to guide a trajectory towards a stable, periodic oscillatory state. The controller utilizes the pole placement method, a state feed

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44

Agarwal, Puneet 1977. "Structural reliability of offshore wind turbines." 2008. http://hdl.handle.net/2152/17723.

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Statistical extrapolation is required to predict extreme loads, associated with a target return period, for offshore wind turbines. In statistical extrapolation, “short-term" distributions of the load random variable(s) conditional on the environment are integrated with the joint probability distribution of environmental random variables (from wind, waves, current etc.) to obtain the so-called “long-term" distribution, from which long-term loads may be obtained for any return period. The accurate prediction of long-term extreme loads for offshore wind turbines, using efficient extrapolation pr

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45

Gottlieb, Oded. "Nonlinear oscillations, bifurcations and chaos in ocean mooring systems." Thesis, 1991. http://hdl.handle.net/1957/36341.

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Complex nonlinear and chaotic responses have been recently observed in various compliant ocean systems. These systems are characterized by a nonlinear mooring restoring force and a coupled fluid-structure interaction exciting force. A general class of ocean mooring system models is formulated by incorporating a variable mooring configuration and the exact form of the hydrodynamic excitation. The multi-degree of freedom system, subjected to combined parametric and external excitation, is shown to be complex, coupled and strongly nonlinear. Stability analysis by a Liapunov function approach reve

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46

Rodriguez, Marijuan Alberto. "Offshore Floating Platforms : Analysis of a solution for motion mitigation." Thesis, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215507.

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Abstract (sommario):

Recent events regarding energy policies throughout the globe and advances in technology are making offshore wind farms become a reality. Most offshore wind farms are still, however, built close to land masses, and need to be rigidly attached to the seabed in one way or another. In many countries, both public and private entities are developing new concepts of floating platforms to overcome the thirty to thirty-five-metre depth limit. Some of these new platforms use and adapt previous Oil and Gas platform concepts, while others are built up from scratch. This Master Thesis covers a hydrodynamic

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