Large Eddy Simulation of Aerodynamic Noise Field Around Super High-Rise Buildings

In order to reveal the mechanism and spatial distribution characteristics of aerodynamic noise around super high-rise buildings, the flow field around super high-rise buildings in the atmospheric boundary layer is solved by using large eddy simulation (LES), and the sound pressure field is numerically calculated by the acoustic analogy method (Ffowcs Williams-Hawkings, FW-H). The result shows that each surface of super high-rise buildings can be regarded as a source of dipolar noise. The aerodynamic noise is generated by a dipole source on building surfaces and is dominated by the wind pressure on those surfaces. The radiation intensity of the sound fields in the along-wind and cross-wind directions is controlled by the corresponding fluctuating pressures. Aerodynamic noise first increases and then decreases with the height, with the maximum value arriving at the approximately 70% of the building height. For spatial points with the same height and distance to building surfaces, the highest total sound pressure will occur at the points facing the building's windward surfaces, followed by that at the points facing the building's leeward surfaces. The lowest total sound pressure will appear at the spatial points facing the building's side surfaces. With the increase of the distance between spatial point and building, the total sound pressure level decreases rapidly. The total sound pressure level decreases more rapidly in the cross-wind direction than in the along-wind direction. This work suggests that the LES method combined with the acoustic analogy method is a feasible way to predict aerodynamic noise produced by super high-rise buildings. The most effective way to reduce the noise level is to reduce the wind pressure on building surfaces by optimizing its aerodynamic shape.