General course objectives
To be able to calculate hydrodynamic and aerodynamic loads specific for offshore wind turbines.
- Design codes for bottom fixed offshore wind turbines. Design basis for wind and wave climate. Extreme value prediction by fitted distributions.
- Substructure types for offshore wind turbines. Design of a substructure.
- Hydrodynamic loads from linear irregular waves. Wave kinematics and the Morison equation. Wheeler stretching and the MacCamy Fuchs diffraction theory. Simplified aerodynamic load model.
- The 1P and 3P dynamic criteria and basic technique for fatigue calculation.
- Wake aerodynamics and vortex structures behind a wind turbine rotor. 1D momentum theory for wakes. Wake interaction in wind farms. Methods for computation of wakes in wind farms.
- Introduction to planning and environmental decisions for offshore wind farms. Introduction to operation and maintenance management for offshore wind farms.
- Basic concepts for floating wind turbines and calculation of mooring forces. Linearised equations of motion for floating wind turbines. Dynamic stability and control of floating wind turbines.
A student who has met the objectives of the course will be able to:
- Describe the typical foundation types for bottom-fixed offshore wind turbines and summarize the content of the IEC 61400-3 design norm
- Apply the elements of a design basis and use statistical data to determine e.g. a 50-year sea state
- Calculate a force time series from linear irregular waves and determine which forces that dominate
- Explain the basic dynamics of bottom fixed offshore wind turbines, the method for fatigue calculations and perform a simple substructure design
- Apply 1D momentum theory for analysis of wind turbine wakes
- Implement closed-form wake models in Matlab
- Analyse the production in rows of wind turbines with application of closed-form wake models and determine the optimal spacing between the wind turbines
- Describe the basic process in planning an offshore wind farm and the interaction between the involved parties
- Understand and suggest simple strategies for operation and maintenance
- Derive the equations of motion for typical floating wind turbine configurations
- Implement time domain models for the dynamics of floating wind turbines subject to wind and wave forcing
- Analyse the dynamic stability of floating wind turbines and propose modifications of the control system to improve stability
Matlab skills equivalent to course 02631/02633. This level of Matlab skills is essential to carry out the course reports. 41106. Fluid Mechanics equivalent to course 41312 or 41101. Numerical Analysis equivalent to course 02601. 46300 - can with some effort be taken concurrently.