基于SST k-ω湍流模型的平衡大气边界层模拟  

Simulation of equilibrium atmosphere boundary layer with SST k-ω turbulence model

作　　者：胡朋[1] 李永乐[1] 廖海黎[1] 

机构地区：[1]西南交通大学桥梁工程系,四川成都610031

出　　处：《空气动力学学报》2012年第6期737-743,共7页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(90915006);教育部新世纪优秀人才支持计划(NCET-06-0802);四川省杰出青年学科带头人计划(2009-15-406);中央高校基本科研业务费专项资金(2010XS02)

摘　　要：为实现SST k-ω湍流模型下空流场大气边界层的平衡,提出通过在湍动能输送方程与比耗散率输送方程中添加源项的方法使来流边界条件与湍流模型相协调,并通过相应的CFD数值算例分别考察了不考虑源项与考虑源项时沿流场不同位置处的平均速度、湍动能及比耗散率剖面的一致性。计算结果表明,当考虑源项时沿流场不同位置处的平均速度剖面、湍动能剖面及比耗散率剖面均有较高程度的一致性,较好地实现了大气边界层的平衡。研究结论为平衡大气边界层的研究提供了新的思路和研究方法,对结构风工程中CFD数值模拟有一定的理论及应用价值。To achieve the equilibrium atmosphere boundary layer in an empty flow field with SST κ-ω tur- bulence model, the method of adding source terms to the turbulent kinetic energy transport equation and the specific dissipation rate transport equation respectively was adopted to make the inlet profiles of average wind and turbulence wind consistent with the turbulence model, the consistency of the average wind profiles, tur- bulent kinetic energy profiles and specific dissipation rate profiles at several different positions with and with- out considering the source terms were investigated respectively according to the corresponding CFD numerical example. The numerical result shows that when considering the source terms in the turbulence model, the average wind profiles, turbulent kinetic energy profiles and specific dissipation rate profiles at several differ- ent positions along the flow field are all maintained very well, which indicates that the equilibrium atmos- phere boundary layer in the empty flow field is achieved satisfactorily. The study conclusion proposes a new idea or research method for modeling the equilibrium atmosphere boundary layer and also provides the further CFD simulations in structural wind engineering with theoretical and actual values.

关 键 词：平衡大气边界层 SST k-ω湍流模型 源项 计算流体动力学 

分 类 号：O357.5[理学—流体力学]