This paper proposes numerical method for aerodynamic performance predictions of Horizontal Axis Wind Turbines (HAWT) immersed on Atmospheric Boundary Layer (ABL) flows under unstable, stable and neutral conditions. The flow field has been described using the three-dimensional RANS equations complemented by the k turbulence model with modified constants corresponding to ABL flows. The density variation has been introduced into the momentum equation using the Boussinesq approximation and appropriate buoyancy term has been included. The equation of energy based on potential temperature has been implemented and solved to take into account the effect of temperature on the flow field (turbulence). The ABL profiles (,
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