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In large eddy simulation of atmospheric boundary layer flows over wind farms,wall-layer models are generally imposed for the surface fluxes withoutconsidering the spatial variability of the surface roughness. In this study, weconsider the near-surface model in conjunction with square of the velocitygradient tensor to model the adaptive dissipation of turbulence production. Thesurface roughness is incorporated through Monin-Obhukhov similarity theory forthe computational cells immediately adjacent to the Earth's surface. Theunderlying proposed near-surface model captures the significant amount ofReynolds stresses in the near-surface and is able to maintain the log-lawprofile in wind farms. The present study indicates that the suggested`near-surface model' is relatively robust in comparison to the classical`near-wall model'.

Dynamic modelling of near-surface turbulence in large eddy simulation of wind farms