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Flow over hills: A Large-Eddy Simulation of the Bolund case

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Abstract
  • Simulation of local atmospheric flows around complex topography is important for several applications in wind energy (short term wind forecasting and turbine siting and control), local weather predictions in mountainous regions and avalanche risk assessment. However atmospheric simulation around steep mountain topography remains challenging and there exist several way to implement the topography in the model. The Immersed Boundary Method provides an alternative approach that is particularly well suited for efficient and numerically stable simulation of flows around steep terrain. It uses a homogenous grid and permits a fast meshing of the topography. In this article, the Immersed Boundary Method is used in conjunction with a Large Eddy Simulation (LES) and tested against two unique data sets. In the first comparison, the LES is used to reproduce the experimental results from a wind tunnel study of a smooth three dimensional hill. In the second comparison, we simulate the wind field around the Bolund Hill, Denmark, and make direct comparisons with field measurements. Both cases show good agreement between the simulation results and the experimental data, with the largest disagreement between simulation and experiment observed near the surface. The source of error is investigated by performing additional simulations with a different resolutions and surface roughness properties.
  • Keywords: Validation of computational fluid dynamics models, Navier-Stokes equation, Complex terrain, Immersed boundary method, Topography, Computational fluid dynamics, Bolund, Large-eddy simulation
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  • Diebold, M., Higgins, C., Fang, J., Bechmann, A., & Parlange, M. B. (2013). Flow over hills: A large-eddy simulation of the bolund case. Boundary-Layer Meteorology, 148(1), 177-194. doi:10.1007/s10546-013-9807-0
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  • 148
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  • 1
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  • We would like to thank the Swiss National Science Foundation for their financial support under grant 200021-120238.
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