摘要
针对长宽高为1:4:4的AIJ建筑模型进行建模,拟合风洞入流实验数据得到服从指数分布的入流风剖面,为数值模拟与实验测试入流条件的一致性提供保证。以RNG k-ε、Realizable k-ε及LES等3种模型为依据进行数值计算,选定较典型的屋顶中心、背风面旋涡中心点垂直方向上的三维速度,与实测数据分别从定性、定量两个角度进行对比分析,结果表明:LES计算结果与实验值吻合程度最高、RNG k-ε模型次之、Realizable k-ε模型最差,但总体趋势都与实验值较接近;基于SPSS统计分析软件,利用非参数独立样本检验及相关性分析等数理统计理论初探性地定量说明了以上3种模型的精确程度:均未出现显著性差异,且相关系数均大于0.8呈高度相关。验证了不同湍流模型的精确性,并为城市建筑环境风湍流的数值模拟技术提供规范性指导。
A building model with the scale ratio of 1：4：4 made by Architectural Institute of Japan（AIJ）was selected.Providing a guarantee about the consistency of inflow condition with the test,a wind profile was achieved by exponential fitting.The performance of CFD prediction of flow around the model based on various turbulence models such as RNG κ-ε,Realizable κ-ε and LES were investigated and the results was analyzed by comparison with experimental data from the quantitative and qualitative perspectives.The results show that the trend made by CFD is closer to the test value,and the results of the LES models show better agreement with the measured distribution than the RNG κ-ε model and Realizable κ-ε model.Especially,statistical analysis method was carried out by SPSS,and the parameters named nonparametric significance test and correlation coefficient were used to explore the accuracy of different models qualitatively.And the results found that no significant differences emerged and the correlation coefficients were greater than 0.8 defined high correlation.This verifies the accuracy of the different turbulence models and provides a normative guidance for CFD technology of the numerical simulation of wind turbulence in building environment.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2017年第1期108-113,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51346006)
内蒙古自治区自然科学基金资助项目(No.2012ZD08)
