不同湍流模型建筑风湍流特征精确性研究

发布时间：2019-06-09 23:25

【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。
[Abstract]:The AIJ building model with length, width and height of 1:4:4 is modeled, and the inflow wind profile obeying the exponential distribution is obtained by fitting the wind tunnel inflow experimental data, which provides a guarantee for the consistency between the numerical simulation and the experimental test. Based on the three models of RNG k-蔚, Realizable k-蔚 and LES, the three-dimensional velocity in the vertical direction of the center of the roof and the vortex center of the leeward surface is selected, which is qualitatively compared with the measured data. The results show that the calculated results of LES are in the highest agreement with the experimental values, followed by the RNG k-蔚 model, and the Realizable k-蔚 model is the worst, but the overall trend is close to the experimental values. Based on SPSS statistical analysis software, the accuracy of the above three models is quantitatively explained by using mathematical statistical theories such as nonparametric independent sample test and correlation analysis. There is no significant difference between the above three models. The correlation coefficients were higher than 0.8, and there was a high correlation between them. The accuracy of different turbulence models is verified, and it provides normative guidance for the numerical simulation technology of wind turbulence in urban building environment.
【作者单位】：内蒙古工业大学能源与动力工程学院;风能太阳能利用技术教育部省部共建重点实验室;
【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)
【分类号】：TU119

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