Title:	Wind Turbine and Wind Farm Wakes
DNr:	SNIC 2016/10-33
Project Type:	SNIC Large Compute
Principal Investigator:	Stefan Ivanell <stefan.ivanell@geo.uu.se>
Affiliation:	Uppsala universitet
Duration:	2016-07-01 – 2017-07-01
Classification:	20306 20304 20301
Homepage:	http://space.hgo.se/ivanell/?q=node/6
Keywords:

Abstract

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, as well as studying more practical problems regarding for example the control and optimization of large wind farms. In the latter case, 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 newly been made available for comparison purposes, as well as metmast data measured on a 180-m tower, which will is now being use 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. We are now actively working with the developers of EllipSys3D on improving and validating extensions of this code to model the flow under different atmospheric stability and terrain conditions. One newly recruited 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. Although we are using the actuator disc and actuator line representations of the turbine rotors, that have proven to be efficient ways of reducing computational requirements, such calculations remain 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 2015, 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. 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.