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Scale-adaptive turbulence modeling for LES over complex terrain

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Abstract

The large-eddy simulation (LES) is an efficient method for the study of atmospheric boundary layer (ABL) flow over complex terrain. However, the robustness of LES is influenced by dynamics methods for the subgrid-scale stress, which remains one of the challenging issues. Here, we present a scale-adaptive LES methodology to study ABL flow over complex terrain. We present a canopy stress method for LES over complex terrain, which provides no-slip and shear-stress boundary conditions using a cost-effective Cartesian mesh. We consider measurements from wind tunnel experiments for the investigation of a scale-adaptive subgrid-scale modeling framework for LES of wind flow over a hilly terrain. A flow simulation is then performed on six cases of ABL flow over an idealized complex terrain. The LES result is also compared against the measurement of wind over Askervein hill. The dynamic and non-dynamic versions of the turbulence kinetic energy-based subgrid model are also considered to illustrate the scale-adaptive nature of subgrid-scale turbulence. It was observed that ignoring scale-adaptivity of subgrid turbulence, LES can under-predict shear-stress, turbulence kinetic energy, and other statistical measures of atmospheric turbulence.

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Acknowledgements

The authors acknowledge the computational facilities provided by the Compute Canada (graham.computecanada.ca). JMA acknowledges financial support from NSERC, and MASB acknowledges President awards and SWASP funds of the Memorial University of Newfoundland.

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  1. Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John’s, NL, A1C5S7, Canada

    Md. Abdus Samad Bhuiyan & Jahrul M. Alam

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  1. Md. Abdus Samad Bhuiyan
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  2. Jahrul M. Alam
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Correspondence to Jahrul M. Alam.

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Bhuiyan, M.A.S., Alam, J.M. Scale-adaptive turbulence modeling for LES over complex terrain. Engineering with Computers 38, 1995–2007 (2022). https://doi.org/10.1007/s00366-020-01190-w

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