文档介绍：摘要摘要膜结构作为近年来应用十分广泛的新型大跨度空间结构之一,其显著的特点是结构质量轻、柔性大、阻尼小,属于风敏感性结构。由于膜结构的体型复杂,国内外一般都通过风洞试验的方法来确定风压系数,但目前各种形态的膜结构风洞试验开展得还极为有限,不足以进行规律性的研究。 ,围绕着基于雷诺平均模拟(RANS)方法的膜结构平均风压场数值模拟进行,对这类结构的平均风压场效应展开系统深入研究具有重要的理论意义和工程实用价值。本文首先选取CAARC标准高层建筑模型为对象,,建立了以场地实测风场数据作为来流边界条件的实尺度数值模型, (RANS)的常用湍流模型,来考察数值风洞方法中计算域、网格划分、边界条件、湍流模型及其他计算参数的确定。通过计算结果与实测数据及风洞试验结果的比较,验证了数值风洞方法模拟条件的可行性与正确性,并探讨了两个湍流模型用于数值模拟分析的适用性。本文采用有限元计算软件ANSYS ,并从中提取膜结构几何模型,将其导入流体域,再划分网格建立膜结构绕流的流体计算模型,进而实现对膜结构绕流平均风压场的数值模拟。针对上述两种基本体型的膜结构——鞍形、伞形,分析了不同风向、不同矢跨比和不同高跨比等因素对膜结构表面风压系数分布的影响规律,并给出了相应的膜面风压系数分布图,可供工程设计参考。关键词:数值模拟;索膜结构;CAARC标准建筑模型;风压系数; ABSTRACT ABSTRACT As one ofthelong—span space structures,membrane structure isusedwidely in recent years,which is characterized by lightweight,flexibility,small-damping,and belongs tothewind sensitivity of plex figures ofmembrane structure,wind pressure coefficients on membrane structure surface monly determined by wind tunnel testing athome and abroad,however,due tothelimitedwind tunnel dataforvariousforms ofmembrane structure,it isinsufficient to conduct the regular on ANSYS-CFX platform,research works of numerical simulation inthispaper are approached byadopting theReynolds Averaged Navier-Stokes(RANS) andindepth researchs onwind effectsof this kindofstructures haveimportant theoreticalsignificance andpractical value. The CAARC standard high—risebuilding model was selected toberesearchobject, andtongji university TJ-2wind tunnel eomnlon RANS turbulence model provided by ANSYS·CFX ,the fullscalenumerical model whose flowboundary conditions wasbaSed onmeaSured wind field dataWas established to study the calculation domain,meshing,boundary conditions,turbulent model and other calculationparameters of numerical paring thenumerical simulation resuRs with themeasured dataofwind tunnel testresults,the fea