低矮建筑非定常绕流大涡模拟影响因素研究

掌握结构周围风场及其特性，是开展建筑结构抗风设计的基础。借助采用大涡模拟（LES）的方法，对低矮建筑非定常绕流进行了大涡数值模拟研究，分别分析了不同运算时间、建筑物不同高度处及不同风速因素，对低矮建筑非定常绕流特性的影响。结果表明：（1）随着时间的增加，建筑物迎风侧的速度和压力均增大，背风侧的压力出现了负值，速度最小值出现在背风侧的涡中心位置；（2）随着建筑物高度逐渐增加，涡的位置逐渐向上偏移，由于风速比较均匀，当遇到建筑物时，在建筑物迎风侧，速度流线会形成一种上升的趋势，背风侧的压力逐渐增加；（3）随着风速的增加，建筑物的背风侧出现了大涡且速度逐渐增大，背风侧的压力最小值逐渐减小。

Research on Large Eddy Simulation Influence Factors of the Unsteady Flow around a Low-rise Building

To grasp the wind field around the structure and its characteristics is the basis for wind resistant design of building structure.By using large eddy simulation (LES) method,of low rise buildings unsteady often flow around the large eddy numerical simulation study,the factors of different operation time,buildings of different height and different wind speed were analyzed,the non around flow characteristics of low rise building,The results showed that:(1)With the increase of time, buildings on the windward side of the velocity and the pressure increased, the leeward side pressure appeared negative, the minimum velocity in the leeward side of the vortex center;(2) as the height of the building increases gradually,the position of the vortex gradually upward shift,due to the wind speed is uniform,when encountered buildings, in the windward side of the building,line speed will form a rising trend, the leeward side of the pressure gradually increased;(3) with the increase of wind speed,the lee side of the building appeared large eddy and gradually increasing the speed, pressure on the leeward side of the minimum decreases gradually.