Journal cover Journal topic
Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
https://doi.org/10.5194/wes-2018-20
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research articles
04 Apr 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).
Microscale model comparison (benchmark) at the moderate complex forested site Ryningsnäs
Stefan Ivanell1, Johan Arnqvist1, Matias Avila2, Dalibor Cavar3, Roberto Aurelio Chavez-Arroyo4, Hugo Olivares-Espinosa1, Carlos Peralta5, Jamal Adib5, and Björn Witha6 1Uppsala University, Wind Energy Section, Campus Gotland, 621 67 Visby, Sweden
2Barcelona Supercomputing Center, BSC, Spain
3Wind Energy Department, Technical University of Denmark, Denmark
4National Renewable Energy Centre (CENER), Spain
5Wobben Research and Development MS GmbH, Germany
6ForWind – Carl von Ossietzky Universität Oldenburg, Germany
Abstract. This article describes a study where modellers were challenged to compute the wind at aforested site with moderately complex topography. The target was to match the measured windprofile at one exact location for three directions. The input to the modellers consisted of detailedinformation of forest densities and ground height derived from Airborne Laser Scans (ALS). Allparticipating models except two used the full detailed ground and forest information to modelthe forest which is considered a significant progress. The ALS based data resulted in reasonableagreement of the wind profile and turbulence magnitude. The best performance was found tobe that of LES using a very large domain. For the RANS type of models the constants in theturbulence closure was shown to be of great significance for the turbulence level, but of muchless importance for the wind speed profile. Overall, the article gives an overview of how welldifferent types of models are able to capture the flow physics at a moderate complex forestedsite.
Citation: Ivanell, S., Arnqvist, J., Avila, M., Cavar, D., Chavez-Arroyo, R. A., Olivares-Espinosa, H., Peralta, C., Adib, J., and Witha, B.: Microscale model comparison (benchmark) at the moderate complex forested site Ryningsnäs, Wind Energ. Sci. Discuss., https://doi.org/10.5194/wes-2018-20, in review, 2018.
Stefan Ivanell et al.
Stefan Ivanell et al.
Stefan Ivanell et al.

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This article describes a study where modellers were challenged to compute the wind at a forested site with moderately complex topography. The target was to match the measured wind profile at one exact location for three directions. The input to the modellers consisted of detailed information of forest densities and ground height. Overall, the article gives an overview of how well different types of models are able to capture the flow physics at a moderate complex forested site.
This article describes a study where modellers were challenged to compute the wind at a forested...
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