CAARC标准高层建筑三维钝体绕流风场数值模拟  

Numerical Simulation of 3D Atmospheric Flow Around a Bluff Body of CAARC Standard High-Rise Building Model

作　　者：聂少锋[1] 周绪红[1,2] 周天华[1] 石宇[1] 

机构地区：[1]长安大学建筑工程学院,西安710064 [2]兰州大学土木与力学学院,兰州730000

出　　处：《土木建筑与环境工程》2009年第6期40-46,共7页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金资助项目(50078021);教育部高等学校博士学科点专项基金项目(2000053203)

摘　　要：基于计算流体力学软件平台Fluent 6.3,选用基于雷诺平均(RANS)的标准k-ε、Realizablek-ε、RNGk-ε和SSTk-ω4种湍流模型对大气边界层中CAARC标模的单栋高层建筑的三维定常风流场进行模拟分析,并将数值模拟结果与风洞试验结果进行了比较分析。结果表明:数值模拟较好地反映了高层建筑周围风环境的绕流特性和表面风压的分布情况,4种湍流模型均能给出满足工程应用精度的结果。在迎风面时,与试验结果吻合良好;在侧风面和背风面时,数值模拟结果介于NPL与TJ-2试验结果之间。迎风面均受有正压力,在迎风面的2/3高度处为最大,两边及底下最小。建筑物的背风面和侧风面全部承受负压力。4种湍流模型的模拟结果之间差异较小,为高层建筑钝体绕流的研究提供了依据。Based on Reynolds Averaged Navier-Stokes Equations（RANS）standard k-ε model, realizable k-εmodel, RNG k-ε model and SST k-ε model, the 3D steady wind flow field around standard high building CAARC in atmospheric boundary layer was numerically simulated with software Fluent 6.3. And upon the comparison with those from wind tunnel test, it was found that numerical simulation was a feasible way to study the wind flow around high building and the distribution of wind pressure in the building＇s surface. The four proposed models can reach the accuracy from the actual demand. Furthermore, it was also shown that, the numerical results were approximate to those from wind tunnel tests in the windward while between those from NPL and TJ-2 tests in the side and leeward. The pressure on the windward surface was positive with the maximum at 2/3 height and the minimum on the sides and the bottom. The pressures on the leeward surface and two sides were negative. There were little differences among the results of the four models.

关 键 词：计算流体动力学 高层建筑 CAARC标模 湍流模型 数值分析 

分 类 号：TU312.1[建筑科学—结构工程]