9788866550532.pdf
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...
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Firenze University Press
2022
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oapen-20.500.12657-549572022-06-01T03:04:33Z An Integrated Nonlinear Wind-Waves Model for Offshore Wind Turbines Marino, Enzo bic Book Industry Communication::T Technology, engineering, agriculture::TN Civil engineering, surveying & building::TNK Building construction & materials bic Book Industry Communication::T Technology, engineering, agriculture::TN Civil engineering, surveying & building::TNT Building skills & trades 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. 2022-05-31T10:17:54Z 2022-05-31T10:17:54Z 2011 book ONIX_20220531_9788866550532_241 2612-8020 9788866550532 9788866550518 9788892736429 https://library.oapen.org/handle/20.500.12657/54957 eng Premio Tesi di Dottorato application/pdf n/a 9788866550532.pdf https://books.fupress.com/isbn/9788866550532 Firenze University Press 10.36253/978-88-6655-053-2 10.36253/978-88-6655-053-2 bf65d21a-78e5-4ba2-983a-dbfa90962870 9788866550532 9788866550518 9788892736429 22 230 Firenze open access |
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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. |
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2022 |
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