ABSTRACT:In order to predict wind loads on building structures in the atmospheric boundary layer (ABL) employing large eddy simulation (LES), the primary task would be to generate proper turbulent inflow boundary condition (IBC), which is one of the main influence factors for LES. The objective of this paper is to present a simple IBC generation method to improve the LES predictions for building loads in the ABL using the commercial code Fluent. The proposed method is a combination of equilibrium IBC expressions for Reynolds averaged NavierStokes (RANS) equations with the random flow generation (RFG) procedure, which is used in Fluent. The equilibrium IBC is used for the solution of steady-state RANS to obtain information for the RFG procedure. In order to verify the efficiency of the present method, the simulation of wind flow field around a single tall building was carried out by adopting the above computing process. Detailed comparisons between the simulated and the experimental results show that the present method was verified as being applicable to a certain extent in predicting wind loads on buildings.