Abstract
AbstractCurrently, there has been growing attention in using computational fluid dynamics (CFD) for wind assessment of wind farm on complex terrain. A major issue that effects the efficiency of CFD simulations in terrain is the inconsistent profile of the atmospheric boundary layer (ABL). The aim of this work is to analysis the influence level of imposed boundary conditions in the thermo-fluid coupled interface on the homogeneity Horizontal of ABL in CFD simulations on a flat terrain by using CFD commercial code COMSOL Multiphysics. Four different parameters were examined, velocity, turbulent parameters (kinetic energy, dissipation rate) and turbulent heat flux. This study mentioned the inlet conditions for neutral ABL when used in combination with scalable wall function with roughness. The horizontal homogeneity by the profile is tested by 2D Reynolds-Averaged Navier-Stokes (RANS) coupled with standard k-ɛ turbulence model. The results show that ABL inconsistent profiles can be a major cause of inaccuracy and can degrade efficiency of airflow forecasts in a wind farm located on complex terrain.KeywordsCFDAtmospheric Boundary LayerHorizontal InhomogeneityTemperature Profile
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