Developing modified k–εturbulence models for neutral atmospheric boundary layer flow simulation using OpenFOAM  

作　　者：Yuanbo Wang Jiqin Li Wei Liu Jiankai Dong Jing Liu 

机构地区：[1]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 [2]Tianjin Key Laboratory of Indoor Air Environmental Quality Control,School of Environmental Science and Engineering,Tianjin University,92 Weijin Road,Tianjin 300072,China [3]Division of Sustainable Buildings,Department of Civil and Architectural Engineering,KTH Royal Institute of Technology,Brinellvägen 23,10044 Stockholm,Sweden

出　　处：《Building Simulation》2024年第12期2281-2295,共15页建筑模拟(英文)

基　　金：supported by the National Natural Science Foundation of China(52378093);the Center for High Performance Computing,Harbin Institute of Technology,China.

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–εmodels 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–εmodel 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.

关 键 词：urban airflow computational fluid dynamics(CFD) atmospheric boundary layer OPENFOAM turbulence model 

分 类 号：O35[理学—流体力学]