The evaluations of wind forces on structures are highly complex due to overall building design and scale. The wind flow on and around buildings is receiving more importance among architects and urban planners to ensure the safety and economical design. Computational fluid dynamics (CFD) simulation is regularly employed for the evaluation of wind forces like accessing the wind flow pattern and aerodynamic coefficients. The present study focuses on building structures with an aspect ratio in the plan of 1:2:3 for the computational simulation. The building is geometrically scaled down to 1:300 and simulated using the Improved Delayed Detached Eddy Simulation turbulence model (IDDES) along with the formulation of k–ω Shear Stress Transport (SST). This simulation investigates and compares the aerodynamic parameters, wind flow patterns, the size of recirculation, and wake separation zones in a three-dimensional plane. The velocity profiles are quantified in terms of width of the building (D) and Cpmean (mean pressure coefficients) at 0° and 90° wind incidences. The Cpmean is validated against the results obtained from the Boundary Layer Wind Tunnel (BLWT) experimental results. © Springer Nature Singapore Pte Ltd. 2019.