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Influence of porosity of reformed earth embankment windbreak wall on flow field and displacement of catenary under crosswinds
Journal of Wind Engineering and Industrial Aerodynamics ( IF 4.8 ) Pub Date : 2021-05-11 , DOI: 10.1016/j.jweia.2021.104652
Xiao Dong , Tanghong Liu , Zouliang Shi , Yutao Xia , Fan Yang , Zhengwei Chen

Flow fields around reformed earth embankment windbreak walls (REEWWs) with five different porosities under crosswind were studied using the improved delayed detached eddy simulation (IDDES) based on the SST κ-ω turbulence model by computational fluid dynamics (CFD) in this paper. Based on the simulated flow field results, the finite element method (FEM) was adopted to analyze the wind-induced displacement of the catenary. The spatial dimensions of the five REEWWs were identical, but they had different porosities, with values of 0%, 12.5%, 25%, 37.5%, and 50%. The three-dimensional effects of the porosity on the flow structures and streamline patterns around the REEWWs and catenary, and wind-induced displacement of the catenary were investigated. The numerical algorithm used in this study was verified with the results from field tests. The results showed that installing a porous windshield on the top of the earth embankment windbreak wall will change the original flow structures. The windshield with a porosity of 37.5% reduced the wind speed around the catenary by 61.25% for line1 and 89.36% for line2, and the displacement of the catenary was reduced by 96.86%. Therefore, the protection performance of the catenary was improved.



中文翻译:

改良风土堤防风墙孔隙度对侧风作用下悬链线流场和接触网位移的影响

本文采用基于SSTκ-ω湍流模型的改进延迟分离涡模拟(IDDES),通过计算流体力学(CFD)研究了侧风下具有五个不同孔隙度的改良土堤防风墙(REEWW)周围的流场。在模拟流场结果的基础上,采用有限元方法(FEM)分析了悬链线的风致位移。五个REEWW的空间尺寸相同,但孔隙率不同,分别为0%,12.5%,25%,37.5%和50%。研究了孔隙度对REEWWs和悬链线周围流动结构和流线型态的三维影响,以及悬链线的风致位移。现场测试的结果验证了本研究中使用的数值算法。结果表明,在土堤防风墙的顶部安装多孔挡风玻璃会改变原始的流动结构。孔隙率为37.5%的挡风玻璃使1号线和2号线的悬链线周围的风速分别降低了61.25%和89.36%,并且悬链线的位移减少了96.86%。因此,改善了悬链线的保护性能。

更新日期:2021-05-12
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