Wind Turbine and Wind Farm Wakes

SNIC 2017/11-10


SNAC Large

Principal Investigator:

Stefan Ivanell


Uppsala universitet

Start Date:


End Date:


Primary Classification:

20306: Strömningsmekanik och akustik

Secondary Classification:

20304: Energiteknik

Tertiary Classification:

20301: Teknisk mekanik



Our group at Uppsala University Campus Gotland has been performing research on wind turbine wakes for more than a decade. We are interested in improving knowledge about the fundamentals of wake dynamics, validating and improving wind turbine aerodynamic models, for example over forested and complex terrain characteristic of the Swedish landscape, and under different atmospheric stability conditions. We are also studying more practical problems regarding the control and optimization of large wind farms, where we are aiming at increasing the production while minimizing turbine loadings. The amount of wind power development in Europe has reached a level where it has become important to investigate the effect of wind farms on each other; this is also one of the main issues we are interested in. It is important to mention that our participation to two annexes from the International Energy Agency has made possible an access to experimental data, which is a key issue for most of the studies we are performing. Data measured on LIDARs upstream and in the wake of wind turbines has also recently been made available for comparison purposes. Metmast data measured on a 180-m tower that we have access to is now being used in an international benchmark exercise investigating the capability of today’s microscale models in modeling the flow under complex and forested conditions. The group also established a close collaboration with The Technical University of Denmark (DTU) which has resulted in a very fruitful collaboration. Our calculations are performed using the code EllipSys3D, developed at Risø/DTU, which makes use of Large-Eddy Simulations. One researcher in our group experienced with using the platform OpenFoam to perform Large-Eddy Simulations will be actively involved different projects requiring a great amount of computational resources. The simulations we are performing are quite demanding. The amount of projects we are involved in as well as the increase in the number of researchers in our group has resulted in an increase in computational resources that are needed by our group to fulfill its research goals. The present application summarizes in detail work that has been performed by our group since July 2016, using SNIC resources, as well the projects that are planned for in the next year. Our group is in a very good position to successfully perform different calculations whose implications are important both for an increase in the fundamental understanding of wake behavior as well as more practical information that can be very useful for the industry. Our international recognition in performing Large Eddy Simulations resulted in an invitation to write a review paper on the subject, which was recently published in the Philosophical Transactions of the Royal Society A. this would not have been possible without access to large computation resources like those granted from SNIC. We acknowledge SNIC for the work that we could perform up to now, and we hope that the present demand will result in a positive outcome, allowing us to fulfill the projects we have planned for.