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DDES analysis of wind-induced interference effect on three prisms aligned in parallel

DOI：10.7511/jslx20200903001

 作者 单位 E-mail 张爱社 山东建筑大学 土木工程学院, 济南 250101 acclan@263.net 高翠兰 山东建筑大学 交通工程学院, 济南 250101 王元雷 山东省建筑设计研究院有限公司第八分院, 济南 250001

采用基于SSTk-ω湍流模型的延迟分离涡模拟方法DDES （Delayed detached eddy simulation），对三并列线性布置柱体的风荷载和流场特性进行了数值模拟。为验证方法的有效性，对单个三维方柱绕流进行了计算分析，比较计算值与试验结果的风荷载特征，两者符合较好。然后采用DDES研究了三并列方柱对称布置时，间距比对中间受扰建筑风致干扰的问题。数值结果表明，间距比较小时对受扰建筑风荷载分布有较大影响。总的来看，当间距比约为3.0时，受扰建筑的影响达到最大。同时，数值分析了三方柱周围瞬态流场特征，探讨了临近建筑之间的干扰机理。结果表明，SST-DDES方法能够较好地预测绕方柱流动分离问题，可为群体高层建筑气动相互干扰研究提供参考。

The numerical simulation for wind loads and wind fields of three prisms sitting side by side in line is employed based on the shear stress transport k-ω(SST k-ω) model and the delayed detached-eddy simulation(DDES).Firstly,three-dimensional flows around a single square cylinder are simulated.The time-averaged results are compared between numerical and experimental data,which shows good agreement.The DDES method is verified by comparing the computational results with the experimental results for turbulent flows around a cylinder.The numerical analysis of separation ratio effects is carried out for the interference along and across wind directions,respectively,among three square prisms aligned in parallel at equal space.The computational results indicate that the separation ratio among the prisms has a significant interfering effect on the wind load distribution on the central building.Generally,when the separation ratio is 3.0,the interference effect on the central cylinder is up to the maximum value.The interfering mechanism among the buildings is discussed preliminarily.The present results indicate that the current implementation of SST-DDES method is able to simulate turbulent flows with separation for high Reynolds numbers.The results of the paper are useful for the research of wind-induced interference effects on the tall buildings.