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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.

Wind turbines.

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"On November 8th, 1977, President Jimmy Carter made a televised address to the US nation on the subject of energy. There was a crisis. Political tensions had resulted in an embargo on oil exports from the Middle East, on whose output much of the industrial world then relied. The price of oil, which had been unchanged in real terms since the Second World War, trebled in little over a year. Carter acknowledged America's dependency on oil and outlined a range of measures to encourage energy saving, new fuels, and the production of electricity from renewable sources: for the first time these would include solar and wind power on a large scale"--

Wind turbines

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• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Wind turbines.

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

Wind turbines

Choose an application

• Reference Manager
• EndNote
• RefWorks (Direct export to RefWorks)

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.

Wind turbines.