The Bolund Experiment,Part II: Blind Comparison of Microscale Flow Models |
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| Authors: | Email author" target="_blank">A?BechmannEmail author N?N?S?rensen J?Berg J?Mann P-E?Réthoré |
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| Institution: | 1.The Wind Energy Department,Ris? National Laboratory for Sustainable Energy/Technical University of Denmark,Roskilde,Denmark |
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| Abstract: | Bolund measurements were used for a blind comparison of microscale flow models. Fifty-seven models ranging from numerical
to physical were used, including large-eddy simulation (LES) models, Reynolds-averaged Navier–Stokes (RANS) models, and linearized
models, in addition to wind-tunnel and water-channel experiments. Many assumptions of linearized models were violated when
simulating the flow around Bolund. As expected, these models showed large errors. Expectations were higher for LES models.
However, of the submitted LES results, all had difficulties in applying the specified boundary conditions and all had large
speed-up errors. In contrast, the physical models both managed to apply undisturbed ‘free wind’ boundary conditions and achieve
good speed-up results. The most successful models were RANS with two-equation closures. These models gave the lowest errors
with respect to speed-up and turbulent kinetic energy (TKE) prediction. |
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