移动型下击暴流风场及其对多层建筑表面风压影响的研究

he actual downburst is often accompanied with overall movement, and its wind field characteristics are significantly different from the static downburst. The numerical model of moving impinging jet has been established to study the unsteady wind field characteristics of moving downburst and the wind pressure characteristics of multi-storey buildings, while horizontal moving speed of downburst is taken as the key variable. The results show that the movement of the jet center leads to the deviation between storm center and jet center, and an extreme wind speed area of the bow-shaped distribution is formed at the front of the storm. The offset distance increases and the radial width of the bow region decreases with the increase of moving speed. Moreover, for =0.3, the offset distance reaches up to 0.7Djet, and the radial width reduces to about 1.5Djet. When the storm passes by, the wind pressure characteristics change dramatically with time. Different moving speeds lead to differences in the wind field structure, which affects the distribution of wind pressure characteristics. The wind pressure coefficient can differ by up to 1.304 at the same position on the building under different moving speeds.