鞍形屋盖平均风压分布特性的数值模拟研究

基于Reynolds时均N?S方程和RSM模型对鞍形屋盖的平均风压分布进行了数值模拟,采用有限体积法对控制微分方程进行离散,并采用SIMPLE压力校正算法来实现非线性方程的迭代求解。数值模拟结果与风洞试验结果进行了对比分析,两者吻合较好,在此基础上系统研究了风向角、跨高比、矢跨比、地面粗糙度、风速等因素对屋面风压分布的影响,探讨了结构周围流场的绕流特性。最后根据屋面的结构形式及风压分布特点将鞍形屋面分成12个区,给出了不同风向角下的分区风载体型系数以供工程设计的参考。

NUMERICAL SIMULATION OF MEAN WIND PRESSURE DISTRIBUTION ON SADDLE ROOF

Based on the Reynolds-averaged N ? S equations and Reynolds stress equation model (RSM), the numerical simulation of mean wind pressure distribution on a saddle roof is performed. The finite volume method is employed to discretize the governing differential equations, and the SIMPLE pressure correction iteration algorithm is adopted to solve the nonlinear equations. The numerical results are found to have good agreement with the experimental results. The characteristics of wind pressure distribution and the flow field are discussed by considering some parameters such as wind direction, span-height ratio, rise-span ratio, roughness of terrain and wind velocity. Finally, based on the roof shape and the regularity of wind pressure distribution, the saddle roof is divided into twelve sub-regions and the local wind pressure coefficients of every region are provided for the engineering design.