摘要
建立了某拟建复杂形体超高层建筑的全尺度模型,编写了其入口平均风速剖面、湍动能和湍流耗散率的UDF程序,并选取0度、30度和-30度三种来流风向角,考察了这三种典型来流工况下建筑绕流流场。比较分析表明,相对于标准k-ε模型,RNG k-ε模型和Realizable k-ε模型能更好地捕捉该复杂形体超高层建筑的绕流流场分布特征。同时,在钝体迎风面流动分离的拐角处,RNG k-ε模型和Realizable k-ε模型均可以给出其合理的湍动能分布形态;并且,在流动分离的负压区可以给出其具有满意精度的平均风压分布。
Full scale model of a complex-shaped super high-rise building to be constructed is established to numerically investigate the flow field around. The UDF program of mean wind section plane,turbulence kinetic energy, and turbulence dissipation rate are then compiled. Under selected typical inflow conditions, including the 0 degree,30 degree, and - 30 degree,the flow fields are evaluated embracing the complex shape super high-rise building. The results show that compared with standard k - ε modal,both the RNG k - ε model and the Realizable k - ε modal can better simulate the distribution features of the present complex-shaped super high-rise building. Both of them can give better reasonable turbulence kinetic energy distribution in the region of windward sharp edge ,where flow separation occurs. Likewise,the mean pressure field with desirable precision can be obtained in the highly turbulent negative pressure region.
出处
《四川建筑科学研究》
2014年第2期1-9,共9页
Sichuan Building Science
关键词
复杂形体高层建筑
计算流体动力学
雷诺平均模型
边界条件
湍流模型
风流场
数值模拟
complex-shaped super high-rise building
Computational Fluid Dynamics （CFD）
Reynolds Averaged Navier-Stokes method（RANS）
boundary conditions
turbulence model
flow fields
numerical sinmulation
