Computational Fluid Dynamics study on the performance and mechanism of suction control over a high-rise building

摘要

In order to reduce the wind-induced drag and improve the wind-resistance performance of a high-rise building,nactive suction control was proposed to investigate its drag-reducing property through ComputationalnFluid Dynamics (CFD) method. The numerical method was validated by the experiment of suction controlnover a backward-facing step fl ow. Effects of the dimensionless suction fl ux, the suction angle and the slotnsize on drag reduction for a high-rise building model were analysed, and the detailed fl ow fi elds (includingnthe time-averaged stream and vorticity fi elds), the boundary layer development and turbulence characteristicsnlike turbulent kinetic energy for the suction models were presented to discuss the mechanism of suctionncontrol. The results indicate that suction is very effective in reducing the wind-load of a high-rise buildingnmodel, and only the dimensionless suction fl ux is important, while the orifi ce geometrical parameters andnthe suction velocities show little infl uence on drag reduction. The mechanism of suction control is concludednthat suction can bring more fl ows around the windward face, restrain the fl ow separation andndecrease the width of the wake for the suction models.