论文部分内容阅读
为研究不同雷诺数对大跨度屋盖结构表面风压分布特性的影响,采用大涡模拟计算流体动力学方法,计算二维屋盖表面平均和脉动风压系数;系统分析雷诺数对屋盖表面风压分布、流动分离及再附着现象的影响.数值计算结果表明:随着屋盖表面特征雷诺数的变化,屋盖表面风压分布亦发生明显变化,特征雷诺数较低时屋盖表面风压较平稳,特征雷诺数升高时屋盖前部的风压系数大幅增大,但增幅逐渐降低,最终趋于稳定.结果验证了雷诺数效应在屋盖结构风荷载模拟中的重要影响.
In order to study the influence of different Reynolds number on the wind pressure distribution characteristics of long-span roof structure, large eddy simulation method is used to calculate the average and fluctuating wind pressure coefficient of two-dimensional roof surface. The Reynolds number is analyzed systematically on the roof surface Wind pressure distribution, flow separation and reattachment phenomenon.The numerical results show that with the change of the Reynolds number of the roof surface, the wind pressure distribution on the roof surface also changes obviously. When the characteristic Reynolds number is low, When the characteristic Reynolds number increases, the wind pressure coefficient at the front of the roof increases greatly, but the amplitude gradually decreases and eventually stabilizes. The results show that the Reynolds number effect plays an important role in the roof wind load simulation.