Open AccessInfluence of turbulence boundary condition on pollutant diffusion for a natural draft cooling tower with flue gas injection
Author(s) -
Guangjun Yang,
Li Ding,
Zhaobing Guo
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1300/1/012093
Subject(s) - turbulence , reynolds averaged navier–stokes equations , mechanics , turbulence modeling , k epsilon turbulence model , boundary layer , pollutant , meteorology , boundary value problem , diffusion , environmental science , turbulent diffusion , atmospheric sciences , physics , thermodynamics , chemistry , organic chemistry , quantum mechanics
The influence of the specification of turbulence model in equilibrium atmosphere boundary layer (ABL) on the numerical simulation of pollutant diffusion for a natural draft cooling tower with flue gas injection is investigated. The ABL must be considered due to the immense size of cooling tower. The flow field and pollutant distribution under the circumstance of different turbulence boundary conditions are predicted by solving Navier-Stokes (N-S) equations based on shear-stress transport (SST) k-ω turbulence model. The results indicate that the pollutant distribution remains almost unchanged when the turbulence boundary condition changed, it can be inferred that the turbulence boundary condition has little effect on the diffusion of pollutant for other Reynolds Average Navier-Stokes (RANS) turbulence models. Since RANS cannot consider the fluctuation velocity, it is not very suitable for predicting the pollutant diffusion. To more accurately simulate the pollutant propagation and diffusion, the large eddy simulation (LES) model is needed.