In super-tall buildings, the impacts of wind loads are of more importance than earthquakes, and inevitably, the wind tunnel testing provides reliable results of the wind loads due to their high level of sensitivity and accuracy, although it burdens a high cost. In this paper, we have applied the ‘numerical methods’ in order to obtain the 2D and 3D drag coefficients. The CFD simulation was performed by the “ANSYS FLUENT” software. The results shown by the k-ω Shear Stress Transport (SST) turbulence model within a fine mesh and by selection of the small time-step size and also increasing the number of iterations… , prove that the accuracy of the analysis is enhanced in which it is valid for the Large Eddy Simulation (LES) model as well. The Grid Convergence Index (GCI) is obtained using the uniform velocity and pressure coefficients within a reasonable range, which is maintained by an average mesh in order to minimize the spent time and the associated cost. Meanwhile, the pressure-correction gradient along the cell faces is more compatible with the results obtained by Kawamoto except one point. As the duration of winding increases, the negative (vacuum) pressure on the leeward side develops and the wake also moves farther. The results also show that the maximum wind pressure applied to the building using the SST method is larger than the one in the LES method, but the LES method has less variation in height. Moreover, the wind resisting behavior of super tall buildings is better represented by3D modeling and the results of the simulation are more accurate and realistic, according to the experimental results.
