EOL Seminar: Investigation of small scale topography for wind energy

Tuesday, March 20, 2018 - 15:30 to 16:30
FL2 - 1022
Contact Name: 
Diane Sierra
Contact Email: 
Contact Phone: 

Prof. Jakob Mann
Technical University of Denmark (DTU)

Ten years ago, DTU made a field experiment around a three-dimensional escarpment on a peninsula called Bolund. Cup anemometers and 25 sonic anemometers were mounted on 10 masts, and two profiling lidars were deployed. The purpose was to provide a data set for validation of flow modeling over complex terrain mainly for wind energy resource calculations. A blind comparison showed that models had difficulties predicting the wind deficit (or wake) downstream of the escarpment. Typically, the wake height was severely underestimated by the models. To investigate this zone more carefully, a scanning Doppler lidar was deployed in 2011 measuring profiles through the escarpment wake. The wake was sharply separated from the incoming, less turbulent flow and the interface was rapidly undulating. The average height of the wake was very sensitive to the direction of the inflow which was hard to reproduce in numerical models. In 2015 a physical model of the Bolund escarpment at a scale of 1 to 20 was tested in the “wind dome” facility called WindEEE in London, Ontario. The wake height was measured and small changes to the escarpment shape that are unlikely to be resolved in a numerical model made huge changes to the flow. Consequences for a wind turbine positioned on an upscaled version of the hill will briefly be summarized and perspectives for wind resource estimation will be outlined.

Tuesday, 20 March 2018, 3:30 PM
Refreshments 3:15 PM
NCAR-Foothills Laboratory
3450 Mitchell Lane • Bldg 2 Large Auditorium (Rm1022)
Webcast: https://ucarconnect.ucar.edu/live (Room 2: FL2-1022)