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Influence of complex terrain on a flow above a forest with clearing
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Journal Article
Influence of complex terrain on a flow above a forest with clearing
2020
Overview
Large Eddy simulations of the Lemnhult wind farm in Sweden are compared to LiDAR measurements of the site. Two scans have been performed, one in southerly direction in order to investigate the flow over a forest, another one in westerly direction, in order to investigate the flow over a clearing. A forest model is implemented in STAR-CCM+ using the local forest height data, while assuming flat terrain in one simulation and including the terrain height in another to investigate its effect for each scan. The complex terrain simulations show the best agreement with the measurements. Uncertainty of the stratification of the measurements can be the reason for some of the difference. The vertical wind speed for the clearing scan change considerably when the terrain representation is included, but the magnitude is however still low compared to the horizontal velocity. This shows the importance of including terrain for simulations with variation in terrain height. The normalized turbulent kinetic energy for the vertical profiles show a decrease in the clearing scan compared to the forest scan which should be beneficial for wind turbines.
Publisher
IOP Publishing
Subject
