大跨度复杂屋盖结构风荷载的大涡模拟

应用一种新的湍流脉动流场产生方法DSRFG(Discretizing and Synthesizing Random Flow Generation)1]模拟风场实际的湍流边界条件,采用一种新的大涡模拟(Large Eddy Simulation,LES)的亚格子模型2],基于Linux系统下软件平台Fluent6.3的并行计算技术,对深圳新火车站进行了数值风洞模拟。并将屋盖的平均风压、脉动风压计算结果与风洞试验数据进行了比较,表明数值模拟很好地反映了大跨度屋盖表面风压的分布情况,由其得到的风压系数与风洞试验数据有较好的吻合。表明本文的DSRFG方法以及新的大涡模拟亚格子模型的数值模拟技术是一种很好的预测大型、复杂结构表面风荷载的有效方法。并为进一步发展在复杂湍流环境下大跨度屋盖结构的风荷载数值风洞技术提供参考。

Simulation of large eddy of wind load on a long-span complex roof structure

A new inflow turbulence generator called discretizing and synthesizing random flow generation technique is applied to simulate the actual inflow boundary conditions of turbulent flow field. A new one-equation dynamic subgrid scale (SGS) model is adopted for the present large eddy simulations. The mean pressures and fluctuating pressures on the roof of the Shenzhen new railway station are calculated based upon the paralleled technology of Fluent 6.3 software platform under the linux system. The computational results are compared with the wind tunnel test results. It is found that the numerical simulations can predict the wind pressure distributions and overall good agreement is achieved between the computed wind pressure coefficients and the corresponding model test results. Hence, it is concluded that the DSRFG method and the new one-equation SGS model is an effective tool for predicting the wind loads of huge and irregularly shaped buildings.