【摘要】 湍流封闭模型是影响建筑风工程数值模拟计算结果精度的至关重要的影响因素之一,本文针对数值风工程研究中最常见的钝体绕流问题,比较研究了基于RANS方法的标准κ—ε模型、Realizableκ—ε模型、RNGκ—ε模型、v2—f模型及RSM模型等五种湍流模型对风压和风速计算结果的影响。比较研究的对象是SRI完成的6m立方柱建筑模型[1],风压数值计算结果的比较参考值为该研究项目的场地实测值,风速比较则采用文献[2]的风洞试验结果。通过比较分析得出结论:在研究比较的五种湍流模型中,RNGκ—ε模型和v2—f模型的数值预测结果相对较好,它们基本可以反映这一典型钝体结构绕流的复杂流动特性。更多还原

【Abstract】 Turbulence model is one of the most important factors affecting the numerical predicting results.To be aimed at the problem of predicting wind pressure and velocity around rectangular buildings,five turbulence models based on RANS,including Standard κ—ε model,Realizable κ—ε model,RNG κ—ε model,v~2—f model and RSM model,are adopted in the numerical prediction.The reference wind pressure is the result of full scale field measurement by SRI in reference[1],and the reference wind velocity is taken from the wind tunnel test by Minson et al in reference[2].The results calculated with RNG κ—ε model and v~2—f model are relatively closer to the reference ones than to the other three turbulence models investigated,and their numerical predicting result are acceptable in engineering application.更多还原