数值风洞的工业厂房屋面体形系数分析

摘要

Using the Spalart-Aumaras turbulent model in Fluent software, the numerical wind-tunnel technique for wind field around structures is implemented. Because of the serious destruction of the low-height industrial workshop existed within the strong wind area of southeast china, numerical simulation of wind field around industrial workshop is applied. From the prediction, pressure distribution on the roof, shape coefficient on the roof and the pressure distribution on the whole structure are obtained. The influence of the height of the industrial workshop on pressure distribution and shape coefficient is discussed. Study shows that the upwind face of the industrial workshop is easy to be destroyed by the plus pressure, the upwind and top positions on the roof is easy to be destroyed by the minus pressure, and the side and back faces is not easy to be destroyed due to the weak minus pressures on them.%结合低层工业厂房风荷载及抗风性能的研究,采用基于计算流体动力学技术的数值风洞方法,应用Fluent软件中的Spalart-Allmaras湍流模型,对不同高度厂房周围的风场和表面风压进行了数值模拟,得出屋面风压分布、风载体形系数以及整体结构表面的风压分布.分析了厂房高度对屋面风压分布和体形系数的影响,对不同高度封闭性厂房结构风灾作用后的受损部位进行分析.研究表明,侧壁不通风厂房在迎风面上较容易遭受正压力引起的压坏;在屋面的前缘和屋顶处容易遭受负压力引起的掀起破坏;侧面和背面的负压力较小,不容易产生破坏.