ITM Web of Conferences
Volume 2, 2014First Symposium on OpenFOAM® in Wind Energy
|Number of page(s)||4|
|Section||Atmospheric Boundary Layer Flows|
|Published online||18 February 2014|
Influence of a roughness length error on vertical wind speed extrapolation for 2D ideal hills using an OpenFOAM® RANS simulation
Technion – Israel Institute of Technology, Faculty of Aerospace Engineering, 32000 Haifa, Israel
In modelling wind flow over a flat and complex terrain, the choice of roughness-length-distribution is critical for accurate wind speed predications. This choice is often made based on the Davenport scale . A satellite or aerial image of the location is used [2–4] and subjective or objective measures are used for translating the image into roughness length - z0 - based on the Davenport scale. The choice of a Davenport table value is generally regarded as within an error of plus or minus one table value, leading to a ±6% error in wind speed predictions for a flat terrain in neutral conditions . In the paper this error is studied for a non-flat terrain, using a series of CFD simulations for 2D hills of various combinations of aspect ratio and steepness. Results show that the wind speed prediction error as a result of a “wrong” parameterization decreases with hill steepness until separation occurs. As a result of separation the error increases slightly, and then decreases again with a further increase in hill steepness.
© Owned by the authors, published by EDP Sciences, 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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