深圳大运会主体育场罩棚风压分布的数值模拟

为了求得体育场罩棚的风载体型系数,基于Reynolds时均N-S方程和RSM模型对深圳大运动会主体育场罩棚风压分布特性进行了数值模拟.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.将数值计算结果与风洞试验结果进行了对比,两者吻合较好,在此基础上,分析了风向角和风攻角对风压分布的影响,探讨了罩棚周围流场的绕流特性,并根据罩棚的结构形式及风压分布特点,给出了最不利风向下罩棚表面的区域平均风压系数以及罩棚设计风荷载的计算方法.结果表明:风向角对风荷载的影响较大,不同风向角下,来流的分离和漩涡脱落作用均有较大的不同.风攻角对罩棚表面风压分布的影响不大,对罩棚局部峰值的影响在15%以内,整体影响在5%以内.

Numerical simulation of wind pressure distribution on the stadium for Shenzhen universiade

In order to get the shape factor of wind load on the stadium,numerical simulation of wind pressure distribution was performed on the stadium for Shenzhen universiade based on the Reynolds-averaged N -S equations and Reynolds stress equation model(RSM).The finite volume method was employed to discretize the governing differential equations and the SIMPLE pressure correction iteration algorithm was adopted to solve the nonlinear equations.Numerical results are found to have good agreement with experimental results.On this basis,the characteristics of wind pressure distribution and the flow field characteristics were discussed by considering wind direction and wind attack angles.At last,according to the roof shape and the regularity of wind pressure distribution,mean wind pressure coefficients of regions were provided.The results show that wind direction has great influence on the separation and vortex shedding of the wind flow.The angle of attack has little influence on the wind pressure distribution on the roof,its influence on the local peak value is less than 15% and that on the whole influence is less than 5%.