典型空间结构平均风压分布及绕流特性的数值模拟

运用计算流体动力学技术，基于FLUENT6．1．22流体动力学数值模拟平台，采用雷诺应力模型，对球壳、悬链面壳及椭圆双曲抛物面壳这3类结构的平均风压分布及绕流特性进行了深入研究。首先将数值模拟结果与风洞试验结果进行对比，验证了数值模拟方法的正确性；然后系统研究了风速、风向角、地面粗糙度、缩尺比、矢跨比等因素对结构风压分布及其绕流特性的影响；最后在B类场地下，根据结构形式和风压分布规律，对结构的压力系数进行面积上的加权平均得到工程上实用的体型系数，可供设计参考。

Numerical Simulation of Characteristics of Mean Wind Pressure Distribution and Flow Field on Typical Spatial Structures

Based on FLUENT 6.1.22 soft platform with Reynolds stress model （RMS）, authors implied the computational fluid dynamics （CFD） numerical simulated technology to research mean wind pressure distribution on typical spatial structures, such as dome, catenoid and elliptic hyperbolic paraboloid, as well as the characteristics of fluid influence around the structures. The numerical simulation results were found to have good agreement with the wind tunnel experimental results. The characteristics of wind pressure distribution and the flow field were discussed by considering some parameters, such as wind velocity, wind direction angle, roughness of terrain, scale and rise-span ratio. Finally, based on the structure shape and the regularity of wind pressure distribution, in site category B, the local wind pressure coefficient of every region was gained, which can provide reference for the engineering design.