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Design Aspects Of The Hydrodynamic And Structural Loading On Floating Offshore Platforms Under Wave Excitation
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Book Synopsis Design Aspects of the Hydrodynamic and Structural Loading on Floating Offshore Platforms Under Wave Excitation by : A. Incecik
Download or read book Design Aspects of the Hydrodynamic and Structural Loading on Floating Offshore Platforms Under Wave Excitation written by A. Incecik and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design Aspects of the Hydrodynamic and Structural Loading on Floating Offshore Platforms Under Wave Excitation by : A. Incecik
Download or read book Design Aspects of the Hydrodynamic and Structural Loading on Floating Offshore Platforms Under Wave Excitation written by A. Incecik and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Hydrodynamics of Offshore Structures by : Subrata Kumar Chakrabarti
Download or read book Hydrodynamics of Offshore Structures written by Subrata Kumar Chakrabarti and published by WIT Press. This book was released on 1987 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject of hydrodynamics applied to offshore structures is vast. 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. 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 method involved. This makes the book suitable as a text for undergraduate and graduate students specializing in offshore and ocean engineering.
Book Synopsis Wind energy. Methods for computation of wave forcing and the resulting motion of a slender offshore floating structure by : Olga Glöckner
Download or read book Wind energy. Methods for computation of wave forcing and the resulting motion of a slender offshore floating structure written by Olga Glöckner and published by GRIN Verlag. This book was released on 2018-07-19 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: Academic Paper from the year 2014 in the subject Engineering - Civil Engineering, grade: 1,0, University of Hannover (A&M University Texas, Ludwig-Franzius-Institut für Wasserbau, Ästuar- und Küsteningenieurwesen), language: English, abstract: This thesis investigates how wave loads act on an OC3 Hywind spar-buoy. The author analyzes the resulting motions of the support platform. This work also contains a detailed presentation of the topic with useful additional information and graphics. Unlike fossil fuels (like oil, coal and natural gas), wind energy is a renewable energy resource. Since winds at sea are stronger and more consistent than onshore winds, the demand for offshore wind turbines has increased over the last years. As energy can be produced more efficient in deeper water, several floating offshore wind turbine constructions, such as the OC3 Hywind spar-buoy, have been proposed. The design of floating wind turbines depends on the simulation of the system behavior caused by exciting forces. A general overview of regular and irregular waves as well as hydrostatic and hydrodynamic loads acting on floating structures is given in chapter 2. Furthermore, essential formulations for calculating motions of FOWTs are given at the end of this chapter. Since all simulations carried out in this thesis are based on the OC3 Hywind concept, detailed information about this floating wind turbine model are given in chapter 3. Three different methods are used for the estimation of wave induced loads and motions. Section 4 describes a modified Morison formulation in the time domain which is applied by the commercially available software MATLAB. On the basis of the diffraction theory the commercial offshore software package SESAM simulates wave excitation forces and responding motions which are presented and discussed in chapter 5. The third method is the open source code FAST that computes wave induced loads and motions based on the first-order potential theory and Kane’s equation of motion. Basic formulations used in FAST and essential hydrodynamic results are shown in chapter 6. The comparisons between the simulations of the three programs are represented and the individual results are analyzed in chapter 7.
Book Synopsis Dynamics of Offshore Structures by : Minoo H Patel
Download or read book Dynamics of Offshore Structures written by Minoo H Patel and published by Butterworth-Heinemann. This book was released on 2013-10-22 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. The book begins with an overview of offshore oil and gas development and offshore structures. Separate chapters follow on the ocean environment; basic fluid mechanics; gravity wave theories; fluid loading on offshore structures; hydrostatics and dynamic response of floating bodies; and model testing of offshore structures. This book is prepared with particular emphasis on the fundamentals of oceanography, basic fluid mechanics, wave theory, hydrodynamics, naval architecture, and structural analysis to meet the needs of students reading ocean engineering or naval architecture, at both undergraduate and postgraduate levels. Basic equations and theoretical results are derived in a rigorous manner but sections on model testing, full-scale measurements, design, and certification are also induced to ensure that the book is of value to professional engineers seeking a balanced treatment of fundamental and practical issues.
Book Synopsis Dynamic Analysis and Design of Offshore Structures by : Srinivasan Chandrasekaran
Download or read book Dynamic Analysis and Design of Offshore Structures written by Srinivasan Chandrasekaran and published by Springer. This book was released on 2017-10-12 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces readers to various types of offshore platform geometries. It addresses the various environmental loads encountered by these structures, and provides detailed descriptions of the fundamentals of structural dynamics in a classroom style, helping readers estimate damping in offshore structures and grasp these aspects’ applications in preliminary analysis and design. Basic concepts of structural dynamics are emphasized through simple illustrative examples and exercises. Design methodologies and guidelines, which are FORM based concepts, are explained through a selection of applied sample structures. Each chapter also features tutorials and exercises for self-learning. A dedicated chapter on stochastic dynamics helps students to extend the basic concepts of structural dynamics to this advanced domain of research. Hydrodynamic response of offshore structures with perforated members is one of the most recent research applications, and has proven to be one of the most effective means of retrofitting offshore structures. In addition, the book integrates the concepts of structural dynamics with the FORM-evolved design of offshore structures, offering a unique approach. This new edition is divided into seven chapters, each of which has been updated. Each chapter also includes a section on frequently asked Questions and Answers (Q&A), which enhances understanding of this complex subject through easy and self-explanatory text. Furthermore, the book presents valuable content with respect to new and recent research carried out by the author in structural dynamics. All numeric examples have been re-checked with more additional explanations. New exercises have been added to improve understanding of the subject matter. Computer coding is also included (wherever possible) to aid computer-based learning of the contents of the book. The book can serve as a textbook for senior undergraduate and graduate courses in civil, structural, applied mechanics, mechanical, aerospace, naval architecture and ocean engineering programs. The book can also serve as a text for professional learning and development programs or as a guide for practicing and consulting offshore structural engineers. The contents of this book will be useful to graduate students, researchers, and professionals alike.
Book Synopsis Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering by :
Download or read book Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering written by and published by . This book was released on 2006 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction of Hydrodynamic Loading on Floating Offshore Platforms by : Ali Abrishamchi
Download or read book Prediction of Hydrodynamic Loading on Floating Offshore Platforms written by Ali Abrishamchi and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation reports on the prediction of the unsteady hydrodynamic forces that act on bluff bodies due to the action of a steady current. Bridge piers and tower structures are common bluff bodies in civil engineering, and a floating Tension-Leg Platform (TLP) is another example of bluff bodies frequently being used in offshore engineering. In this study, the predictions are obtained from the numerical simulations which were performed using a state-of-the-art, computational fluid dynamics (CFD) code which solves the three-dimensional, time-dependent form of the equations governing conservation of mass and momentum. FLOW-3D is a CFD commercial code developed by Flow Science Inc., which we modified and compiled this code to include the proposed modifications in the k-[varepsilon] model. The FLOW-3D code also possesses a treatment to track the movement of the free surface using the Volume of Fluid algorithm as opposed to adopting the usual solid-lid approximation. The effects of turbulence were accounted for using two very different approaches which are Large-Eddy Simulations (LES) and Unsteady Reynolds-Averaged Navier-Stokes (URANS). The former approach finds suitable approximations to account for the influence of the small-scale eddies by incorporating a sub-grid scale model. Generally the small eddies are universal, random, homogeneous and isotropic, but the large energy-carrying eddies were directly computed since unlike small eddies they do not have universal characteristics. The latter approach utilized a two-equation turbulence closure that has been extended to capture the occurrence and consequences of vortex shedding from bluff bodies. The turbulence closures in k-[varepsilon] model fail to capture the correct level of fluctuations in the pressure field associated with the vortex shedding. This deficiency is due to not considering the effects of the interactions between the large-scale organized periodicity of the mean flow and the random, small-scale high-frequency motions that characterize turbulence. To overcome this failure, the effects of the mean-flow periodicity on the energy-transfer process was accounted by modifying the dissipation production term in the turbulence energy dissipation equation due to the actions of the vortex shedding. The turbulence closure with the proposed modifications is to be called the modified k-[varepsilon] model. We explored in this dissertation the capabilities of each modeling approach when applied to a large-scale structure of the type frequently encountered in practice. The modified k-[varepsilon] model was employed in earlier studies to model the hydrodynamics of a two dimensional square cylinder surrounded by a flow. In this dissertation, the proposed modifications in k-[varepsilon] model were utilized to model the wake region downstream of the 2-D and 3-D square cylinders due to the action of a steady current for Reynolds numbers ranging from 104 to 105. The comparisons between the global parameters such as the Strouhal number, mean and r.m.s. values of lift and drag coefficients predicted by the modified k-[varepsilon] model with the measured values from the experiments and results from alternative closures such as Large-Eddy Simulations verified the capability of the modified model to accurately predict the unsteady hydrodynamic forces and hence the flow characteristics for the mentioned higher Reynolds numbers. Three dimensionality of vortices in the wake of a square cylinder was also studied in this dissertation by performing simulations using the modified k-[varepsilon] model and Large-Eddy Simulation for Reynolds number of 105. Similarly, both of the models predicted different magnitudes and frequencies for the time series of the global parameters such as the drag and lift coefficients at different heights of the cylinder which confirmed the existence of three dimensional non-uniform vortices in the wake of the cylinder. In addition, hydrodynamic loads on the various elements of a TLP, and of the effects of the free surface movement on this loading were quantified due to the effects of different uniform current incidences. The test case chosen for this purposes of this assessment was the case of a conventional TLP in a steady current at Reynolds numbers of 7.5x106 and 7.5x107 which are representative of those encountered in deep-sea operations. Experiments and field observations have indicated that the resulting flows exhibit a number of complicated features due to the interactions between the shed vortices and the various structural components of the TLP. Many but not all of these features were captured by the present computations. Loading on the columns of the TLP were found to be highly affected by the presence of a moving free surface. This was concluded from the comparisons made between the time series of drag and lift coefficients for the TLP members predicted by the modified k-[varepsilon] model and LES by utilizing the volume of fluid technique to track the evolution of the free surface. In addition, the extent of the shielding from the front members of the TLP, located upstream, on the aft columns and pontoons was discussed by analyzing the predicted streamwise and transverse hydrodynamic forces of the aft members. The predicted hydrodynamic loading on the TLP members were shown to be very dependent on the current's angle of incidence. This was illustrated by demonstrating the flow field's perturbations in the wake of the TLP members by changing the TLP flow angle of incidence by 45°. Finally, a large discrepancy was shown to exist between the global parameters by comparing the engineering design code estimates for the columns and pontoons of the TLP with the predictions obtained from the present and previous studies, where in estimating the drag coefficients for the pontoons, the engineering design code was concluded to be conservative, while it underestimates the same parameter for the columns which was shown to be attributed to the substantial interference effects as discussed in this dissertation.
Book Synopsis International Workshop on Very Large Floating Structures by : Yoshiyasu Watanabe
Download or read book International Workshop on Very Large Floating Structures written by Yoshiyasu Watanabe and published by . This book was released on 1996 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Marine Design XIII by : Pentti Kujala
Download or read book Marine Design XIII written by Pentti Kujala and published by CRC Press. This book was released on 2018-06-11 with total page 1144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Marine Design XIII collects the contributions to the 13th International Marine Design Conference (IMDC 2018, Espoo, Finland, 10-14 June 2018). The aim of this IMDC series of conferences is to promote all aspects of marine design as an engineering discipline. The focus is on key design challenges and opportunities in the area of current maritime technologies and markets, with special emphasis on: • Challenges in merging ship design and marine applications of experience-based industrial design • Digitalisation as technological enabler for stronger link between efficient design, operations and maintenance in future • Emerging technologies and their impact on future designs • Cruise ship and icebreaker designs including fleet compositions to meet new market demands To reflect on the conference focus, Marine Design XIII covers the following research topic series: •State of art ship design principles - education, design methodology, structural design, hydrodynamic design; •Cutting edge ship designs and operations - ship concept design, risk and safety, arctic design, autonomous ships; •Energy efficiency and propulsions - energy efficiency, hull form design, propulsion equipment design; •Wider marine designs and practices - navy ships, offshore and wind farms and production. Marine Design XIII contains 2 state-of-the-art reports on design methodologies and cruise ships design, and 4 keynote papers on new directions for vessel design practices and tools, digital maritime traffic, naval ship designs, and new tanker design for arctic. Marine Design XIII will be of interest to academics and professionals in maritime technologies and marine design.
Book Synopsis The Proceedings of the ... International Offshore and Polar Engineering Conference by :
Download or read book The Proceedings of the ... International Offshore and Polar Engineering Conference written by and published by . This book was released on 1991 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sea Loads on Ships and Offshore Structures by : O. Faltinsen
Download or read book Sea Loads on Ships and Offshore Structures written by O. Faltinsen and published by Cambridge University Press. This book was released on 1993-09-23 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: After introducing the theory of the structural loading on ships and offshore structures based on the motions of wind, waves and currents, this text demonstrates its applications to conventional and non-conventional sea vessels, including extensive exercises and examples.
Book Synopsis Marine Design XIII, Volume 2 by : Pentti Kujala
Download or read book Marine Design XIII, Volume 2 written by Pentti Kujala and published by CRC Press. This book was released on 2018-06-04 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is volume 2 of a 2-volume set. Marine Design XIII collects the contributions to the 13th International Marine Design Conference (IMDC 2018, Espoo, Finland, 10-14 June 2018). The aim of this IMDC series of conferences is to promote all aspects of marine design as an engineering discipline. The focus is on key design challenges and opportunities in the area of current maritime technologies and markets, with special emphasis on: • Challenges in merging ship design and marine applications of experience-based industrial design • Digitalisation as technological enabler for stronger link between efficient design, operations and maintenance in future • Emerging technologies and their impact on future designs • Cruise ship and icebreaker designs including fleet compositions to meet new market demands To reflect on the conference focus, Marine Design XIII covers the following research topic series: •State of art ship design principles - education, design methodology, structural design, hydrodynamic design; •Cutting edge ship designs and operations - ship concept design, risk and safety, arctic design, autonomous ships; •Energy efficiency and propulsions - energy efficiency, hull form design, propulsion equipment design; •Wider marine designs and practices - navy ships, offshore and wind farms and production. Marine Design XIII contains 2 state-of-the-art reports on design methodologies and cruise ships design, and 4 keynote papers on new directions for vessel design practices and tools, digital maritime traffic, naval ship designs, and new tanker design for arctic. Marine Design XIII will be of interest to academics and professionals in maritime technologies and marine design.
Book Synopsis Sea Loads on Ships and Offshore Structures by : O. Faltinsen
Download or read book Sea Loads on Ships and Offshore Structures written by O. Faltinsen and published by Cambridge University Press. This book was released on 1990-10-25 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book introduces the theory of the structural loading on ships and offshore structures caused by wind, waves and currents, and goes on to describe the applications of this theory in terms of real structures. The main topics described are linear-wave induced motions, loads on floating structures, numerical methods for ascertaining wave induced motions and loads, viscous wave loads and damping, stationkeeping and water impact and entry. The applications of the theoretical principles are introduced with extensive use of exercises and examples. They include conventional ships, barges, high speed marine vehicles, semisubmersibles, tension leg platforms, moored or dynamic positioned ships, risers, buoys, fishing nets, jacket structures and gravity platforms. One aim of the book is to provide a physical understanding through simplified mathematical models. In this way one can develop analytical tools to evaluate results from test models, full scale trials or computer simulation, and learn which parameters represent the major contributions and influences on sea loads.
Book Synopsis Offshore Structure Modeling by : Subrata Kumar Chakrabarti
Download or read book Offshore Structure Modeling written by Subrata Kumar Chakrabarti and published by World Scientific. This book was released on 1994 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: While the existing literature on offshore structures touch on model testing, a comprehensive text discussing the design, construction, instrumentation, testing and analysis of the physical model is lacking. This book fills that vacuum and provides, through its survey of the theoretical and practical aspects of physical modeling, an in-depth coverage of the technology of model testing. Its usefulness runs through the entire field of engineering, reaching far beyond its focus on offshore construction; and its breadth of scope should appeal not only to engineers and naval architects but to scientists interested in structural or hydraulic testing as well.
Book Synopsis Comparison of Second-Order Loads on a Semisubmersible Floating Wind Turbine: Preprint by :
Download or read book Comparison of Second-Order Loads on a Semisubmersible Floating Wind Turbine: Preprint written by and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: As offshore wind projects move to deeper waters, floating platforms become the most feasible solution for supporting the turbines. The oil and gas industry has gained experience with floating platforms that can be applied to offshore wind projects. This paper focuses on the analysis of second-order wave loading on semisubmersible platforms. Semisubmersibles, which are being chosen for differentfloating offshore wind concepts, are particularly prone to slow-drift motions. The slack catenary moorings usually result in large natural periods for surge and sway motions (more than 100 s), which are in the range of the second-order difference-frequency excitation force. Modeling these complex structures requires coupled design codes. Codes have been developed that include turbineaerodynamics, hydrodynamic forces on the platform, restoring forces from the mooring lines, flexibility of the turbine, and the influence of the turbine control system. In this paper two different codes are employed: FAST, which was developed by the National Renewable Energy Laboratory, and aNySIM, which was developed by the Maritime Research Institute Netherlands. The hydrodynamic loads arebased on potential-flow theory, up to the second order. Hydrodynamic coefficients for wave excitation, radiation, and hydrostatic forces are obtained with two different panel codes, WAMIT (developed by the Massachusetts Institute of Technology) and DIFFRAC (developed by MARIN). The semisubmersible platform, developed for the International Energy Agency Wind Task 30 Offshore Code ComparisonCollaboration Continuation project is used as a reference platform. Irregular waves are used to compare the behavior of this platform under slow-drift excitation loads. The results from this paper highlight the effects of these loads on semisubmersible-type platforms, which represent a promising solution for the commercial development of the offshore deepwater wind resource.
Book Synopsis Nonlinear Waves and Offshore Structures by : Cheung Hun Kim
Download or read book Nonlinear Waves and Offshore Structures written by Cheung Hun Kim and published by World Scientific. This book was released on 2008 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: The responses of offshore structures are significantly affected by steep nonlinear waves, currents and wind, leading to phenomena such as springing and ringing of TLPs, slow drift yaw motion of FPSOs and large oscillations of Spar platforms due to vortex shedding. Research has brought about significant progress in this field over the past few decades and introduced us to increasingly involved concepts and their diverse applicability. Thus, an in-depth understanding of steep nonlinear waves and their effects on the responses of offshore structures is essential for safe and effective designs.This book deals with analyses of nonlinear problems encountered in the design of offshore structures, as well as those that are of immediate practical interest to ocean engineers and designers. It presents conclusions drawn from recent research pertinent to nonlinear waves and their effects on the responses of offshore structures. Theories, observations and analyses of laboratory and field experiments are expounded such that the nonlinear effects can be clearly visualized.
