Boundary-Layer Meteorology

, 141:245

The Bolund Experiment, Part II: Blind Comparison of Microscale Flow Models

  • A. Bechmann
  • N. N. Sørensen
  • J. Berg
  • J. Mann
  • P.-E. Réthoré
Open AccessArticle

DOI: 10.1007/s10546-011-9637-x

Cite this article as:
Bechmann, A., Sørensen, N.N., Berg, J. et al. Boundary-Layer Meteorol (2011) 141: 245. doi:10.1007/s10546-011-9637-x

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.

Keywords

BolundBlind comparisonComplex terrainComputational fluid dynamicsMicroscaleValidation
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Copyright information

© The Author(s) 2011

Authors and Affiliations

  • A. Bechmann
    • 1
  • N. N. Sørensen
    • 1
  • J. Berg
    • 1
  • J. Mann
    • 1
  • P.-E. Réthoré
    • 1
  1. 1.The Wind Energy DepartmentRisø National Laboratory for Sustainable Energy/Technical University of DenmarkRoskildeDenmark