Response of wind on multiple sides and top opening tall buildings for harvesting the wind energy

This study focused on harvesting wind energy using the opening inside and on top of the building. Five different types of tall building models are considered in this study. The models are square footprints of 1:1:4 (l: b: h). The initial model M1 is considered without any opening inside. The other four models, namely M2, M3, M4, and M5, incorporated a rectangular slot across the vertical direction and a square slot along the vertical direction of the building height. The wind velocity inside the opening is considered for the wind energy harvesting purpose. Horizontal and vertical axis wind turbines (HAWT & VAWT) are employed for power output. The buildings have both horizontal slots and rooftop openings increased the 82% velocity and decreased turbulence kinetic energy (TKE) by up to 98% compared to the other non-roof-opening buildings. The VAWT increases the power output by up to 35% than HAWT, and the power generation increases by 5-11% using the rooftop opening. The double-sided top-opening model (M5) significantly increases the velocity and decreases the TKE inside the opening, which satisfies the implementation criteria of the wind turbine. Using the VAWT at the central position of the building generated 82 kW of power output per second.