Numerical investigation of wind-load reduction for a high-rise building by blowing control

As the wind-induced drag of a building is mainly generated by the flow separation, effects of the influence parameters of blowing control, such as the slot position, blowing angle, slot size and flux coefficient, on performance of the wind-load reduction and the separation control for a high-rise building are analyzed through numerical simulations. It shows that the coefficient of drag reduction (C_DR) is greatly changed when blowing control has different parameters listed above. When the blowing angle is larger than 120°, the C_DR increases firstly and decreases afterwards as the flux coefficient is increased. Mechanism of the drag reduction is discussed, and it is found that the direct reason to bring different C_DR is the along-wind coefficient of blowing momentum (C_mo), which is different from the suction control whose C_DR is mainly determined by the flux coefficient. Lastly, the formulae between the coefficients of pressure reduction and the C_mo are regressed to be referred to for practical application.