Presentations from The Bolund Experiment: Workshop 3-4th December 2009
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1 Downloaded from orbit.dtu.dk on: Dec 26, 2018 Presentations from The Bolund Experiment: Workshop 3-4th December 2009 Bechmann, Andreas Publication date: 2010 Document Version Publisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Bechmann, A. (2010). Presentations from The Bolund Experiment: Workshop 3-4th December Roskilde: Danmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi. Denmark. Forskningscenter Risoe. Risoe-R, No. 1745(EN) General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
2 Presentations from The Bolund Experiment: Workshop 3-4 th December 2009 Risø-R-Report Edited by Andreas Bechmann Risø-R-1745(EN) August 2010
3 Author: Andreas Bechmann Title: Presentations from The Bolund Experiment: Workshop 3-4 th December 2009 Division: Division of Wind Energy Risø-R-1745(EN) August 2010 Abstract (max char.): ISSN ISBN This report contain copies of the presentations given at The Bolund Experiment: Workshop held on the 3-4 th December 2009 at Risø DTU. The agenda of the two days and a participant list is given before the presentations. The workshop was held as part of the EFP project Metoder til kortlægning af vindforholdene i komplekst terræn. Contract no.: ENS Group's own reg. no.: Sponsorship: Energistyrelsen, Danish Energy Agency, Vestas Technology R&D Cover : Picture of Bolund Pages: 162 Tables: 0 References: 1 Information Service Department Risø National Laboratory for Sustainable Energy Technical University of Denmark P.O.Box 49 DK-4000 Roskilde Denmark Telephone bibl@risoe.dtu.dk Fax
4 Contents 1 Introduction Agenda Participants 6 2 Presentations Welcome - by Andreas Bechmann The Askervein Experiment - by Peter A. Taylor The Bolund Experiment - by J. Berg, J. Mann and H.E. Jørgensen Blind Comparison Results - by Andreas Bechmann LES of turbulent wind flows in the ABL - by Vijayant Kumar Physical Modeling of Bolund - by Brad C. Cochran RANS simulations of flow around Bolund - by Niels Sørensen Blind Comparison Simulation Cases 153 Risø-R-1745(EN) 3
5 1 Introduction The wind industry is increasingly relying on a large number of different micro-scale models for resource assessment of sites in complex terrain. There is, however, no consensus from the wind energy community on a standardized methodology for resource assessment modeling. The difficulties in providing guidelines are twofold: The experimental data available for validating the flow models is very limited and no systematic comparison of different flow models exist. With the Bolund Experiment both of these difficulties are approached. The Bolund experiment is a measuring campaign from a complex terrain performed in 2007 and 2008 where high frequency data from 35 anemometers provides a unique database designed to validate micro-scale flow models [1]. Since no systematic comparison of micro-scale models existed it was decided to challenge micro-scale modelers to simulate the wind over Bolund and compare the results systematically. Since the Bolund measurements had not been published the comparison could be made blindly, i.e. the participants would not have prior knowledge of the measurement results. To broaden the types of models participating, modelers were invited worldwide from research institutes, universities and industry. More than 40 groups participated in the blind comparison with well over 50 model predictions and the blind comparison therefore gives an overview of the accuracy of micro-scale models anno On the 3-4 December 2009, 80 specialists in modeling of wind over complex terrain meet at a Risø DTU workshop where the model predictions and the Bolund measurements were revealed. During the workshop, interesting presentations were given about different flow modeling approaches. This report contains copies of the presentations given at the workshop. [1] A. Bechmann, J. Berg, M.S. Courtney, H.E. Jørgensen, J. Mann and N.N. Sørensen. The bolund experiment: Overview and background. Technical Report Risø-R1658(EN), Risø DTU, National Lab., Roskilde, Denmark, Risø-R-1745(EN)
6 1.1 Agenda Below the agenda for the two day workshop is given. The topics of the first day were related to the Bolund experiment and blind comparison while the second day was about different micro-scale modelling approaches. Risø-R-1745(EN) 5
7 1.2 Participants About 80 participants joined the workshop to discuss the results of the blind comparison. We want to thank you all for your positive and constructive attitudes and for making it a memorable event. Below, the workshop participants are listed. Many of the workshop participants also participated in the blind comparison but it has been chosen to keep the participants of the comparison anonymous. We would like to give special thanks for some very interesting presentation to the three invited speakers: Peter A. Taylor (York University, Zephyr North Canada) Vijayant Kumar (Macquarie Holdings) Brad C. Cochran (CPP, inc.) Participant list: 6 Risø-R-1745(EN)
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9 Welcome - by Andreas Bechmann 8 Risø-R-1745(EN)
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16 The Askervein Experiment - by Peter A. Taylor Risø-R-1745(EN) 15
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34 The Bolund Experiment - by J. Berg, J. Mann and H.E. Jørgensen Risø-R-1745(EN) 33
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73 Blind Comparison Results - by Andreas Bechmann 72 Risø-R-1745(EN)
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103 LES of turbulent wind flows in the Atmospheric Boundary Layer - by Vijayant Kumar 102 Risø-R-1745(EN)
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138 RANS CFD simulations of flow around Bolund - by Niels Sørensen Risø-R-1745(EN) 137
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154 Blind Comparison Simulation Cases The description of the simulation cases for the blind comparison is found below. Risø-R-1745(EN) 153
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