Hydrodynamics of offshore structures civil engineering. Part ii deals with the application of linear theory to predict waveinduced motions and loads for floating structures. With the worldwide search for offshore oil and gas moving into increasingly hostile areas of ocean and deep and ultradeep water, floating systems are becoming more widely used. For offshore structures both fls fatigue limit state and uls ultimate limit state analyses are normally carried out.
The topics covered in this book aim to help the reader understand basic principles while at the same time giving the designer enough information for particular designs. Hydromechanical analysis of offshore structures springerlink. Fundamentals concerning wave loading on offshore structures. If international shipping were a country, it would be the sixth largest emitter data from the network for transport and the environment reveals that a 10,000teu container ship emits only 10 grams. Introduction to resistance and propulsion of ships. Centre for autonomous marine operations and systems amos, department of marine technology, ntnu, no7491 trondheim, norway, email. Introduction to the analysis and design of offshore. Nowadays bottom fixed foundations does not offer an answer economical enough to solve that problem.
The subject of hydrodynamics applied to offshore structures is vast. Stability of floating offshore structures at intact and damaged conditions is currently being addressed by adherence to prescriptive regulations, on the basis of qualities of the righting moment. This has initiated development of new structures and concepts. Offshore wind energy industry needs to install wind farms in waters increasingly deeper and further from coast because is there where the wind blows stronger and longer. Reference is made to a number of publications in which further detail and extension of treatment can be explored by the interested reader, as needed. The effect of secondorder hydrodynamics on floating. Design and analysis of floating offshore structures dnv gl. In part i, wave loads on fixed structures are studied in some detail. Comparison of computational fluid dynamics and potential theory approaches to model hydrodynamic loads on offshore structures in recent years, offshore structures are becoming more and more complex in shape and design. Enter your mobile number or email address below and well send you a link to download the free kindle. Offshore structures represent a broad family of structural types to suit water depth, meteorological conditions, and topsides production requirements. This book provides as complete as possible coverage of the subject of hydrodynamics applied to structures.
The drill passes through a system of safety valves called a blowout preventer bop stack. It also describes aerodynamic and hydrodynamic effects due to rotor and platform motions and usage of nonslender support structures. An introduction on offshore engineering and technology. The object is to make some key parts within a rather specialised field accessible to the general fluidmechanics reader. Thus, results are given with derivations, and applications are discussed with the aid of examples, with an. Effect of secondorder hydrodynamics on floating offshore. Drift forces on compact offshore structures in regular 332 hydromechanical analysis of offshore structures and irregular waves. Therefore floating platforms are seen as the answer. Thus, results are given with derivations, and applications are discussed with the aid of examples, with an overview of the advantages and limitations of the. Many of these structures are unique in many respects and their efficient and economic design and installation are a challenge to the offshore community.
It follows that the dot product of two orthogonal unit vectors can be expressed as e i e j. These subject areas, though not mutually exclusive, would include. Dynamics of offshore structures, second edition is a valuable text for students in civil and mechanical engineering programs and an indispensable resource for structural, geotechnical, and construction engineers working with offshore projects. This article is aimed at relating a certain substantial body of established material concerning wave loading on offshore structures to fundamental principles of mechanics of solids and of fluids and to important results by g. This text book is an attempt to provide a comprehensive treatment of hydromechanics for offshore engineers. The main purpose of the hydrodynamic analysis will in many cases be to compute the loads to be. Find materials for this course in the pages linked along the left. Based on the morison equation and diffraction theory, different wave loads over various frequency ranges and underlying hydrodynamic equations were calculated. Therefore, the question about whether potential theory approaches are still reliable and applicable for these new. Offshore structure modeling pdf while the existing literature on offshore structures touch on model testing, a comprehensive text discussing the design, construction, instrumentation, testing and.
Concept of hydrodynamic load calculation on fixed jacket. Numerical modelling of wavecurrent loading on offshore. Physical model testing of floating offshore structures. In this paper we focus on the theoretical study of the hydrodynamics of a jacket platform, subjected to external loading induced by waves and a current. Each chapter is written so that it helps the reader to understand basic principles while at the same time giving the designer enough information for his or her design. Offshore structures offshore drilling equipment the drill string is lowered through a conduit riser.
Aquaterra energy has the ability to deploy teams of experienced, highly creative engineers, focused on solving complex offshore problems. North sea obtained ocean waves offshore structures oscillation parameter phase angle platform pressure probability density probability density function rayleigh distribution. Alexander kielland platform fatigue failure of one brace, overload in 5. Ii offshore structure design and construction paul a frieze encyclopedia of life support systems eolss a jackup comprises a floating hull and three or more legs, which can move up and down relative to the hull. General introduction objectivescope to identify the basic vocabulary, to introduce the major concepts for offshore platform structures, and to explain where the basic structural requirements for design are generated. Although ships are the most environment friendly mode of transport, the sheer fact that shipping carries over 90% of the global trade means that it emits an enormous amount of co 2. Floating systems must be designed and built to withstand harsh environments with innovative methods and techniques being adopted to develop robust as well as. In this paper, the approach defined in 3 was applied to analyze thesemisubmersible platform designed by the university of maine and used within the. Hydrodynamic analyses of classic and truss spar platforms for floating offshore wind turbines fowts were performed in the frequency domain, by considering coupling effects of the structure and its mooring system.
Covering all aspects of the hydrodynamics of offshore structures, this book is designed for use both as an undergraduate and graduate textbook and as a reference work for. Hydrodynamics structural dynamics advanced structural analysis techniques statistics of extreme among others. Hydrodynamics of offshore structures subrata kumar. The hydrodynamic behaviour of the floaters is analysed using panel method. Experimental study of motions of two floating offshore structures in waves article pdf available in brodogradnja 672. Offshore structure design, construction and maintenance covers all types of offshore structures and platforms employed worldwide.
Offshore engineering and technology day1am 11 failure of offshore structures global failure modes of concern are capsizingsinking structural failure positioning system failure examples of accidents which resulted in a total loss. Delft university of technology 2001 number of pages. Wasim software is for hydrodynamic analysis of fixed and floating vessels with or without forward speed, including calculation of global motions and local pressure loading on the vessel. Their complexity, scale, and application demand specialized structural configurations coupled with offshorespecific design and analysis.
The ultimate reference for selecting, operating and maintaining offshore structures, this book provides a road map for designing structures which will stand up even in the harshest environments. The drill string consists of a drill bit, drill collar and drill pipe. Hydrodynamics naval architecture and marine engineering. The model structure is a fourlegged tubular structure scaleddown from a realistic offshore platform. Linear and nonlinear hydrodynamic analysis of vessels. In order to meet the need for offshore exploration and production of oilgas, a new generation of. Achieving the optimum design of floating platforms requires a rigorous analysis chain to establish the response of. Dynamics of offshore structures provides an integrated treatment of the main subject areas that contribute to the design, construction, installation, and operation of fixed and floating offshore structures. Drill pipe sections are added at the surface as the well deepens. Offshore structures offshore drilling equipment which. Design of offshore floaters includes both seakeeping and structural analysis sesam has had these capabilities for many years, supported by data transfer from hydrodynamic to structural analysis. Automatic analysis of floating offshore structures.
In the study of offshore floating wind turbine, a numerical timedomain model is used for the fully coupled dynamic analysis of deep water offshore floating wind turbines such as spartype, bargetype and semisubmersibletype floating wind turbine. Our experience in working on a challenge with no immediate off the shelf answers available and. This project summary report includes a summary of the research objectives. Offshore hydromechanics includes the following modules. Challenges in simulation of aerodynamics, hydrodynamics. Covering all aspects of the hydrodynamics of offshore structures, this book is designed for use both as an undergraduate and graduate textbook and as a reference work for offshore and ocean engineering. This paper presents the current major modeling challenges for floating offshore wind turbine design tools. Review of linear regular and irregular wave theory. Computes global responses and local loading on vessels moving at any forward speed as long as the vessel is. Hydrostatics, static floating stability, constant 2d potential flow of ideal fluids, and flows in real fluids.
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