三维空间曲面结构风荷载的数值模拟

Numerical simulation of wind pressure on spatial structures

运用计算流体动力学技术,基于FLUENT流体动力学数值模拟平台,采用雷诺平均法和大涡模拟技术,对球壳、柱面、悬链面、菱形马鞍面及椭圆双曲抛物面五类结构进行了定常、非定常流场的模拟计算。使用自回归模型的线性滤波法生成了脉动风速的时间序列,该脉动风速的时间序列很好地满足了预先设定的脉动风速谱和空间相关性要求,进而将其代入到实际计算的边界条件当中。将五类空间曲面结构表面风压的模拟计算结果与风洞试验结果定量比较:稳态计算得到的平均风压数据与风洞试验结果吻合理想,非稳态计算得到的脉动风压数据与试验结果差别稍大,其中正高斯曲面模拟精度高于负高斯曲面。

Based on FLUENT soft platform with Reynolds Stress Model (RSM) and Large Eddy Simulation (LES), the wind pressure distributions on structures, such as, dome, cylinder, catenoid, saddle and elliptic hyperbolic paraboloid were obtained in steady and unsteady numerical simulation. The auto-regressive model was adopted to generate the time history of pulse wind speed. The time series satisfied the target spectrum and spatial correlations. Then the time series of pulse wind speed were imposed on the inflow boundary of the computational zone. The steady numerical results conformed with the experimental data very much. The unsteady numerical results match the experimental data a little worse, and the simulation precision of positive Gaussian structures was better than that of negative Gaussian structures.