Numerical investigation of the wind-load reduction for a high-rise building by suction

In order to reduce the wind-induced drag of a high-rise building, the all-height suction method was proposed to investigate its performance of the wind-load reduction through numerical simulation. Effects of the slot position, suction angle, slot size and flux coefficient on the drag reduction (DR) and the separation control were analyzed. The results showed that the DR was more significant under larger flux coefficient, and coefficient of the drag reduction (C_DR) for the high-rise building model under flux coefficient of -0.0686 and suction angle of 15° arrived at 0.523, however, the suction angle and slot size showed little influence on the DR. It was concluded that the direct factor to affect the C_DR was the flux coefficient, namely the dimensionless suction flux of low-velocity flows from the boundary layer. The power required and the reaction forces caused by suction were discussed, and it seemed to have the possibility of producing the ″zero drag coefficient″ and ″zero base moment″ building. Lastly, the formulae between the coefficient of pressure reduction and the flux coefficient were regressed for practical applications.