Developing modified k-ε turbulence models for neutral atmospheric boundary layer flow simulation using OpenFOAM

扫码查看

原文链接

NETL
NSTL
万方数据

外文摘要：Accurate turbulence modeling is essential for simulation studies of urban physics.In this study,the comprehensive atmospheric boundary layer(ABL)model involving a variable model coefficient and an additional turbulent dissipation source term was implemented using the open-source software OpenFOAM.Combined with consistent inlet wind profiles and rough wall functions of different turbulence variables based on the aerodynamic roughness,the model maintained the horizontal homogeneity well.Then,a hybrid approach was introduced to consider buildings immersed in ABL flows,enabling automatic transformation of the turbulence model between the region around the buildings and the free flow region away from any building.Finally,the effects of applying different model forms to the airflow field around buildings were evaluated in detail through three-dimensional building cases representing six urban prototypes based on three wind tunnel databases.Our findings indicated that all modified k-ε models perform well in reproducing the flow data of the CEDVAL and Architectural Institute of Japan(AIJ)experiments consisting of a single building,an array of buildings,and an isolated high-rise building.However,the modified k-ε model with an additional correction term performed poorly in the database of Niigata Institute of Technology and the case of complex terrain and urban building configurations,because the correction term inhibited the generation of turbulent kinetic energy.In addition,from the comparison between the experimental data of all cases,the model with the original formulation of the coefficient performed the best in terms of prediction accuracy.The root mean square errors of the normalized velocity were 0.1250,0.0879,0.1145,0.1350,and 0.1492 in different cases,which proved the reliability of this turbulence model.

外文关键词：

urban airflowcomputational fluid dynamics(CFD)atmospheric boundary layerOpenFOAMturbulence model

作者：

Yuanbo Wang、Jiqin Li、Wei Liu、Jiankai Dong、Jing Liu

展开 >

作者单位：

School of Architecture,Harbin Institute of Technology,Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology,Ministry of Industry and Information Technology,Harbin 150090,China

Tianjin Key Laboratory of Indoor Air Environmental Quality Control,School of Environmental Science and Engineering,Tianjin University,92 Weijin Road,Tianjin 300072,China

Division of Sustainable Buildings,Department of Civil and Architectural Engineering,KTH Royal Institute of Technology,Brinellvägen 23,10044 Stockholm,Sweden

出版年：

2024

DOI：

10.1007/s12273-024-1194-6

建筑模拟(英文版)

ISSN：1996-3599

年,卷(期)：2024.17(12)