Evaluation of fast fluid dynamics with different turbulence models for predicting outdoor airflow and pollutant dispersion

被引:40
作者
Dai, Ting [1 ]
Liu, Sumei [1 ]
Liu, Junjie [1 ]
Jiang, Nan [2 ]
Liu, Wei [3 ]
Chen, Qingyan [4 ]
机构
[1] Tianjin Univ, Sch Environm Sci & Engn, Tianjin Key Lab Indoor Air Environm Qual Control, Tianjin 300072, Peoples R China
[2] Tianjin Univ, Sch Mech Engn, Tianjin 300072, Peoples R China
[3] KTH Royal Inst Technol, Dept Civil & Architectural Engn, Div Sustainable Bldg, Brinellvagen 23, S-10044 Stockholm, Sweden
[4] Hong Kong Polytech Univ, Dept Bldg Environm & Energy Engn, Kowloon, Hong Kong 999077, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
fast fluid dynamics; turbulence model; outdoor airflow; pollutant dispersion; computational efficiency; Smagorinsky turbulence; WIND-TUNNEL; SIMULATION; CFD; ENVIRONMENT; RESOLUTION; BUILDINGS; EMISSIONS; RANS; TIME; FFD;
D O I
10.1016/j.scs.2021.103583
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Fast fluid dynamics (FFD) could provide informative and efficient airflow and concentration simulation. The commonly used turbulence model in FFD was Re-Normalization Group (RNG) k-epsilon turbulence model which solved two transport equations to obtain eddy viscosity. To reduce this part of time and further improve computing speed, this investigation implemented no turbulence model, Smagorinsky model and dynamic Smagorinsky model which calculated eddy viscosity without solving equation in FFD in an open-source program, OpenFOAM. By simulating several outdoor cases of varying complexity and comparing with experiment and CFD, this study assessed the accuracy and computing efficiency of FFD with four turbulence models. Compared with CFD, FFD greatly improved the computing speed without reducing accuracy. The simulation of FFD without turbulence model was fast but inaccurate. FFD with Smagorinsky model increased the computing speed while ensuring the same accuracy as RNG k-epsilon turbulence model. FFD with dynamic Smagorinsky model provided accurate results with high efficiency. Computation errors arose mainly from inaccurate prediction of turbulence dispersion. The computing cost was associated with the number of transport equations and calculation method of model coefficient. This investigation recommended the use of FFD with dynamic Smagorinsky model for outdoor airflow and pollutant dispersion studies.
引用
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页数:16
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