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Author : Arndt Hildebrandt
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (958 download)
Download or read book Hydrodynamics of Breaking Waves on Offshore Wind Turbines Structures written by Arndt Hildebrandt and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Arndt Hildebrandt
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (888 download)
Download or read book Hydrodynamics of Breaking Waves on Offshore Wind Turbine Structures written by Arndt Hildebrandt and published by . This book was released on 2013 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Olga Glöckner
Publisher : GRIN Verlag
ISBN 13 : 3668705224
Total Pages : 137 pages
Book Rating : 4.6/5 (687 download)
Download or read book A comparison of methods for computation of wave forcing written by Olga Glöckner and published by GRIN Verlag. This book was released on 2018-05-17 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diploma Thesis 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: Unlike fossil fuels (for example 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. This thesis deals with the comparison between different methods for calculating wave forces and resulting platform motions of a floating offshore wind turbine. On the one hand, wave exciting loads computed with Morison’s equation are compared to the hydrodynamic forces simulated by the open source code FAST on the basis of the diffraction theory. On the other hand, response motions of the floating structure are simulated by the commercial offshore software SESAM in the frequency domain and compared with the motions calculated by FAST in the time domain.
Author : Maija Benitz
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (959 download)
Download or read book Simulating The Hydrodynamics Of Offshore Floating Wind Turbine Platforms In A Finite Volume Framework written by Maija Benitz and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: There is great potential for the growth of wind energy in offshore locations where the structures are exposed to a variety of loading from waves, current and wind. A variety of computer-aided engineering (CAE) tools, based largely on engineering models employing potential-flow theory and/or Morison's equation, are currently being used to evaluate hydrodynamic loading on floating offshore wind turbine platforms. While these models are computationally inexpensive, they include many assumptions and approximations. Alternatively, high-fidelity computational fluid dynamics models contain almost no assumptions, but at the cost of high computational expense. In this work, CFD simulations provide detailed insight into the complex fluid flow that has not been captured experimentally, nor can be attained with reduced-order models. This work includes a thorough validation of the various CFD toolboxes necessary for simulating offshore floating wind turbine platforms in the ocean environment, from numerical wave propagation to fluid-structure interactions. The fundamental physics of flow around complex structures is examined through various studies to better understand the effects of a fluid interface, truncated ends, structure size, multi-member arrangements and environmental conditions. These factors are explored in terms of drag, lift and frequency of the loads. Additionally, motion of structures in free decay tests and waves are investigated. The work provides insight into the complex fluid flow around floating offshore structures of small draft in a variety of environmental conditions. CFD simulations are used to assess assumptions and approximations of reduced-order engineering models, and explain why, and in which conditions, these models perform inaccurately. Finally, the work provides suggestions for improvements to engineering tools often used for hydrodynamics modeling of floating offshore wind turbines.
Author : Enzo Marino
Publisher : Firenze University Press
ISBN 13 : 8866550515
Total Pages : 232 pages
Book Rating : 4.8/5 (665 download)
Download or read book An Integrated Nonlinear Wind-Waves Model for Offshore Wind Turbines written by Enzo Marino and published by Firenze University Press. This book was released on 2010 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a numerical model capable of simulating offshore wind turbines exposed to extreme loading conditions. External condition-based extreme responses are reproduced by coupling a fully nonlinear wave kinematic solver with a hydro-aero-elastic simulator. First, a two-dimensional fully nonlinear wave simulator is developed. The transient nonlinear free surface problem is formulated assuming the potential theory and a high-order boundary element method is implemented to discretize Laplace's equation. For temporal evolution a second-order Taylor series expansion is used. The code, after validation with experimental data, is successfully adopted to simulate overturning plunging breakers which give rise to dangerous impact loads when they break against wind turbine substructures. Emphasis is then placed on the random nature of the waves. Indeed, through a domain decomposition technique a global simulation framework embedding the numerical wave simulator into a more general stochastic environment is developed. The proposed model is meant as a contribution to meet the more and more pressing demand for research in the offshore wind energy sector as it permits taking into account dangerous effects on the structural response so as to increase the global structural safety level.
Author : Madjid Karimirad
Publisher : Springer
ISBN 13 : 3319121758
Total Pages : 307 pages
Book Rating : 4.3/5 (191 download)
Download or read book Offshore Energy Structures written by Madjid Karimirad and published by Springer. This book was released on 2014-12-05 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides all the key information needed to design offshore structures for renewable energy applications successfully. Suitable for practicing engineers and students, the author conveys design principles and best practices in a clear, concise manner, focusing on underlying physics while eschewing complicated mathematical detail. The text connects underlying scientific theory with industry standards and practical implementation issues for offshore wind turbines, wave energy converters and current turbines. Combined concepts such as wave-wind energy platforms are discussed, as well. Coverage of design codes and numerical tools ensures the usefulness of this resource for all those studying and working in the rapidly expanding field of offshore renewable energy.
Author : Wiesław Ostachowicz
Publisher : Springer
ISBN 13 : 3319390953
Total Pages : 432 pages
Book Rating : 4.3/5 (193 download)
Download or read book MARE-WINT written by Wiesław Ostachowicz and published by Springer. This book was released on 2016-08-30 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a holistic, interdisciplinary overview of offshore wind energy, and is a must-read for advanced researchers. Topics, from the design and analysis of future turbines, to the decommissioning of wind farms, are covered. The scope of the work ranges from analytical, numerical and experimental advancements in structural and fluid mechanics, to novel developments in risk, safety & reliability engineering for offshore wind.The core objective of the current work is to make offshore wind energy more competitive, by improving the reliability, and operations and maintenance (O&M) strategies of wind turbines. The research was carried out under the auspices of the EU-funded project, MARE-WINT. The project provided a unique opportunity for a group of researchers to work closely together, undergo multidisciplinary doctoral training, and conduct research in the area of offshore wind energy generation. Contributions from expert, external authors are also included, and the complete work seeks to bridge the gap between research and a rapidly-evolving industry.
Author :
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (16 download)
Download or read book Effects of Second-Order Hydrodynamics on a Semisubmersible Floating Offshore Wind Turbine written by and published by . This book was released on 2014 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this paper is to assess the second-order hydrodynamic effects on a semisubmersible floating offshore wind turbine. Second-order hydrodynamics induce loads and motions at the sum- and difference-frequencies of the incident waves. These effects have often been ignored in offshore wind analysis, under the assumption that they are significantly smaller than first-order effects. The sum- and difference-frequency loads can, however, excite eigenfrequencies of the system, leading to large oscillations that strain the mooring system or vibrations that cause fatigue damage to the structure. Observations of supposed second-order responses in wave-tank tests performed by the DeepCwind consortium at the MARIN offshore basin suggest that these effects might be more important than originally expected. These observations inspired interest in investigating how second-order excitation affects floating offshore wind turbines and whether second-order hydrodynamics should be included in offshore wind simulation tools like FAST in the future. In this work, the effects of second-order hydrodynamics on a floating semisubmersible offshore wind turbine are investigated. Because FAST is currently unable to account for second-order effects, a method to assess these effects was applied in which linearized properties of the floating wind system derived from FAST (including the 6x6 mass and stiffness matrices) are used by WAMIT to solve the first- and second-order hydrodynamics problems in the frequency domain. The method has been applied to the OC4-DeepCwind semisubmersible platform, supporting the NREL 5-MW baseline wind turbine. The loads and response of the system due to the second-order hydrodynamics are analysed and compared to first-order hydrodynamic loads and induced motions in the frequency domain. Further, the second-order loads and induced response data are compared to the loads and motions induced by aerodynamic loading as solved by FAST.
Author : L. Roald
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (94 download)
Download or read book The Effect of Second-order Hydrodynamics on a Floating Offshore Wind Turbine written by L. Roald and published by . This book was released on 2014 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of offshore floating wind turbines uses design codes that can simulate the entire coupled system behavior. At the present, most codes include only first-order hydrodynamics, which induce forces and motions varying with the same frequency as the incident waves. Effects due to second- and higher-order hydrodynamics are often ignored in the offshore industry, because the forces induced typically are smaller than the first-order forces. In this report, first- and second-order hydrodynamic analysis used in the offshore oil and gas industry is applied to two different wind turbine concepts--a spar and a tension leg platform.
Author : Bernard Molin
Publisher : Cambridge University Press
ISBN 13 : 1009198041
Total Pages : 445 pages
Book Rating : 4.0/5 (91 download)
Download or read book Offshore Structure Hydrodynamics written by Bernard Molin and published by Cambridge University Press. This book was released on 2022-12-31 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: This standalone handbook is an ideal companion for researchers as well as engineers involved in design of offshore systems.
Author : Joao Cruz
Publisher : Springer
ISBN 13 : 3319293982
Total Pages : 345 pages
Book Rating : 4.3/5 (192 download)
Download or read book Floating Offshore Wind Energy written by Joao Cruz and published by Springer. This book was released on 2016-08-20 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a state-of-the-art review of floating offshore wind turbines (FOWT). It offers developers a global perspective on floating offshore wind energy conversion technology, documenting the key challenges and practical solutions that this new industry has found to date. Drawing on a wide network of experts, it reviews the conception, early design stages, load & structural analysis and the construction of FOWT. It also presents and discusses data from pioneering projects. Written by experienced professionals from a mix of academia and industry, the content is both practical and visionary. As one of the first titles dedicated to FOWT, it is a must-have for anyone interested in offshore renewable energy conversion technologies.
Author : Jorgen Fredsoe
Publisher : World Scientific
ISBN 13 : 981449805X
Total Pages : 550 pages
Book Rating : 4.8/5 (144 download)
Download or read book Hydrodynamics Around Cylindrical Structures written by Jorgen Fredsoe and published by World Scientific. This book was released on 1997-03-17 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the subject of wave/current flow around a cylinder, the forces induced on the cylinder by the flow, and the vibration pattern of slender structures in a marine environment.The primary aim of the book is to describe the flow pattern and the resulting load which develops when waves or current meet a cylinder. Attention is paid to the special case of a circular cylinder. The development in the forces is related to the various flow patterns and is discussed in detail. Regular as well as irregular waves are considered, and special cases like wall proximities (pipelines) are also investigated.The book is intended for MSc students with some experience in basic fluid mechanics and for PhD students.
Author : I. Bayati
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (889 download)
Download or read book The Effects of Second-order Hydrodynamics on a Semisubmersible Floating Offshore Wind Turbine written by I. Bayati and published by . This book was released on 2014 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this paper is to assess the second-order hydrodynamic effects on a semisubmersible floating offshore wind turbine. Second-order hydrodynamics induce loads and motions at the sum- and difference-frequencies of the incident waves. These effects have often been ignored in offshore wind analysis, under the assumption that they are significantly smaller than first-order effects. The sum- and difference-frequency loads can, however, excite eigenfrequencies of the system, leading to large oscillations that strain the mooring system or vibrations that cause fatigue damage to the structure. Observations of supposed second-order responses in wave-tank tests performed by the DeepCwind consortium at the MARIN offshore basin suggest that these effects might be more important than originally expected. These observations inspired interest in investigating how second-order excitation affects floating offshore wind turbines and whether second-order hydrodynamics should be included in offshore wind simulation tools like FAST in the future. In this work, the effects of second-order hydrodynamics on a floating semisubmersible offshore wind turbine are investigated.
Author : Seyedeh Sara Salehyar
Publisher :
ISBN 13 :
Total Pages : 138 pages
Book Rating : 4.:/5 (989 download)
Download or read book Fully-Coupled Time-Domain Simulations of the Transient Response of Floating Wind Turbines written by Seyedeh Sara Salehyar and published by . This book was released on 2017 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compared with land-based wind turbines, offshore ones have two clear advantages: the access to steady and strong offshore wind resources, and the proximity to heavily populated coastal areas, so that the loss from transportation of electricity is diminished. Structurally, offshore floating wind turbines are different from their land-based counter parts and existing offshore structures. Thus, current design guidelines cannot be applied for offshore floating wind turbines, and extensive numerical studies are required to predict the dynamic behavior of these novel structures. In this research, a fully coupled time domain hydrodynamic, aerodynamic and mooring cables model is developed to study the transient response of offshore floating wind turbines. In hydrodynamic module of the coupled model, Boundary Element Method is employed to solve the boundary-value problem, and the 4th order Runge-Kutta time marching technique is used to update the position of the free surface. An unsteady wind-blade interaction model based on boundary elements has been developed to calculate the aerodynamic forces. This method achieves fully-3D and fully-unsteady simulations of the wind-blade interactions. A fully nonlinear cable dynamics model which accounts for bending, stretching, and torsional stiffnesses of the cables is employed to simulate the dynamics of the mooring system. Compared to current quasi-static approaches used in cable modeling, the fully nonlinear cable model proves a higher fidelity as it captures all the dynamics of the mooring cables. The information from the aerodynamic, hydrodynamic, and mooring system modules are passed to the dynamic equation of motion in each time step to calculate the responses of a 5MW offshore floating wind turbine. Various relaxation tests have been carried out to investigate the dissipation effects. For the floating turbine we studied, the relaxation tests indicate that in the pitching mode there is no sufficient damping effects to dissipate disturbances (caused by gusts etc.), even if the aerodynamic damping is counted for. However, by approximately including the viscous damping through a Morison-type approach, the decaying rate in pitch motion is significantly increased (indeed, it becomes comparable to the decaying rate in heave motion). Therefore, we conclude that viscosity is the most important source of damping in pitch motion. The response of the 5MW system to an incoming wave train generated by a pulsating pressure distribution on the free surface nearby is studied. This wave train causes responses in surge, heave and pitch directions. However, after it leaves the vicinity of the system the only remaining motion is in the heave direction, which will quickly decay due to the damping effects according to relaxation tests.
Author : William Leo Wood
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (318 download)
Download or read book Application of Short-crested Wave Theory in the Design of Three Dimensional Coastal Hydrodynamic Models written by William Leo Wood and published by . This book was released on 1980 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: In spring 1973 a series of field experiments was initiated to investigate the three dimensional structure of a coastal hydrodynamic system. These field investigations supported the concept that short-crested wave theory is applicable to modeling of incident wind-wave transformations from offshore to the outer surf zone. Application of short-crested wave theory to the design of coastal hydrodynamic models was also considered appropriate because of the theories inherent three dimensional structure. Concurrent with this work two field experiments were conducted in 1974 and 1976 to measure vertical and horizontal distribution of longshore current velocity and to monitor temporal variations in current velocity at a point. In fall 1978 a series of experimental laboratory investigations was initiated to make precise measurements, at close spatial intervals, of wave height decay after breaking. These experiments were carried out to determine a wave height decay expression based upon the assumption that an appropriate physical conceptualization of wave energy dissipation after breaking must consider turbulence dominant to bottom friction. This report presents a detailed summary of these investigations and their results. (Author).
Author : A. JNA. Sarmento
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (898 download)
Download or read book Effects of second-order hydrodynamic forces on floating offshore wind turbines written by A. JNA. Sarmento and published by . This book was released on 2014 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : O. Faltinsen
Publisher : Cambridge University Press
ISBN 13 : 9780521458702
Total Pages : 344 pages
Book Rating : 4.4/5 (587 download)
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.
