Wind energy; CFD simulation of wakes and wind turbine forces
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- Master i teknologi 
Original versionFredriksen, T. Wind energy; CFD simulation of wakes and wind turbine forces. Master thesis, Telemark University College, 2013
Wind power is a clean and renewable energy source, which plays an important role in the world's energy landscape. When developing a wind farm it is beneficial to analyze the flow pattern in order to maximize the total performance of the wind farm, it is also important to predict wake patterns to prevent structural damage on downstream turbines. Traditional fully detailed CFD models will be very computational heavy to utilize for such analysis. In order to perform an analysis with reasonable computational cost, a simplified model is needed. The actuator line model is a simplified model, which is available and implemented in OpenFOAM. Since OpenFOAM is an open source software, it is possible to modify the code as needed. The model was tested, and the results were compared to experimental results from a workshop done by NTNU. In order to achieve the results close to the reference data, the solver needed to be modified. The implicit solver proposed, was able to get close to the reference data for the power and thrust calculations. The actuator line model was useful to predict the wake and calculate the power and thrust, but require a significant amount of tuning to achieve the desired results. The model is sensitive to parameter changes, and will be difficult to verify without experimental data.