The present study highlighted the control of wind velocity inside the different types of openings inside the tall building to harvest the wind energy and implement it for further use. A regular square plan-shaped tall building model of 1:1:4 (length: breadth: height) is considered for the comparative study between the other considered slot-type models. Other slot-type models are considered at different symmetric geometrical shape openings. The openings are contemplated at the upper portion of the models. The considered six models are also of 1:1:4 ratio. Only along wind flow velocity inside the opening is considered according to the shape of the opening geometry. After analysing the computational fluid dynamics (CFD) simulation, the study concluded some important points. The wind velocity inside the opening can be maintained according to the alteration of the geometrical shape of the opening. The minimum opening inside the model increases the velocity. Therefore, the wind energy harvesting devices can be placed at a particular location where the wind velocity increases according to the modified geometrical shape.