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Large eddy simulation of pollutant dispersion in a naturally cross-ventilated model building: Comparison between sub-grid scale models

  • Farzad Bazdidi-TehraniEmail author
  • Shahin Masoumi-Verki
  • Payam Gholamalipour
  • Mohsen Kiamansouri
Research Article Indoor/Outdoor Airflow and Air Quality
  • 5 Downloads

Abstract

In the present article, the flow field and passive gaseous pollutant dispersion in a naturally cross-ventilated isolated single-zone model building have been investigated. The large eddy simulation (LES) approach has been applied together with three different sub-grid scale (SGS) models, namely, wall-adapting local eddy-viscosity (WALE), dynamic Smagorinsky-Lilly model (DSLM), and standard Smagorinsky-Lilly model (SSLM). The flow and passive scalar concentration fields have been compared with available experimental data. It is demonstrated that the three SGS models predict similar flow field. Also, it can be observed that the mean concentration field results obtained from the WALE sub-grid scale (SGS) model are in better agreement with the experimental data than those of DSLM and SSLM by about 8% and 5%, respectively. Moreover, the CPU time required for the computations by the WALE and SSLM models was almost 20% less than that of DSLM, making WALE a more suitable SGS model than the other two models for the prediction of flow and concentration fields in an isolated building. Furthermore, contributions of convective flux and turbulent diffusion flux to the pollutant transportation have been studied. It has been shown that although the convective flux is the main mechanism, the two fluxes have a significant influence on pollutant transportation and distribution.

Keywords

cross-ventilation pollutant dispersion large eddy simulation (LES) sub-grid scale (SGS) models 

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Farzad Bazdidi-Tehrani
    • 1
    Email author
  • Shahin Masoumi-Verki
    • 1
  • Payam Gholamalipour
    • 1
  • Mohsen Kiamansouri
    • 2
  1. 1.School of Mechanical EngineeringIran University of Science and TechnologyTehranIran
  2. 2.Department of Mechanical Engineering, Nowshahr BranchIslamic Azad UniversityNowshahrIran

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