Nonlinear Waves and Offshore Structures
Nonlinear Waves and Offshore Structures

Author: Cheung Hun Kim

Publisher: World Scientific

Published: 2008

Total Pages: 539

ISBN-13: 9810248849

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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.

An Integrated Nonlinear Wind-Waves Model for Offshore Wind Turbines
An Integrated Nonlinear Wind-Waves Model for Offshore Wind Turbines

Author: Enzo Marino

Publisher: Firenze University Press

Published: 2010

Total Pages: 232

ISBN-13: 8866550515

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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.

Marine Structural Design
Marine Structural Design

Author: Yong Bai

Publisher: Butterworth-Heinemann

Published: 2015-09-18

Total Pages: 1010

ISBN-13: 0081000073

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Marine Structural Design, Second Edition, is a wide-ranging, practical guide to marine structural analysis and design, describing in detail the application of modern structural engineering principles to marine and offshore structures. Organized in five parts, the book covers basic structural design principles, strength, fatigue and fracture, and reliability and risk assessment, providing all the knowledge needed for limit-state design and re-assessment of existing structures. Updates to this edition include new chapters on structural health monitoring and risk-based decision-making, arctic marine structural development, and the addition of new LNG ship topics, including composite materials and structures, uncertainty analysis, and green ship concepts. - Provides the structural design principles, background theory, and know-how needed for marine and offshore structural design by analysis - Covers strength, fatigue and fracture, reliability, and risk assessment together in one resource, emphasizing practical considerations and applications - Updates to this edition include new chapters on structural health monitoring and risk-based decision making, and new content on arctic marine structural design