Simulations of indoor airflow and particle dispersion and deposition by the lattice Boltzmann method using LES and RANS approaches

• Published in: Building and environment 2016-06, Vol.102, p.1-12
• Main Authors: Sajjadi, H., Salmanzadeh, M., Ahmadi, G., Jafari, S.
• Format: Article
• Language: English
• Subjects: Airflow; Computational fluid dynamics; Computer simulation; Deposition; Discrete random walk method; Dispersions; k−ε; LBM; LES; Mathematical models; Particle dispersion and deposition; SISM; Turbulence; Turbulent flow
• ISSN: 0360-1323; 1873-684X
• DOI: 10.1016/j.buildenv.2016.03.006

In this paper the Lattice Boltzmann method (LBM) in conjunction with the large eddy simulations (LES) and Reynolds Averaged Navier–Stokes (RANS) models was used to study the airflow and particle dispersion and deposition in indoor environments. The turbulent airflow was simulated first using the LES in framework of LBM, in which the sub-grid scale turbulence effects were simulated through a shear-improved Smagorinsky model (SISM). The airflow was also simulated using the k−ε turbulence model within the framework of LBM by the addition of two populations for the turbulence kinetic energy, k, and the dissipation rate, ε. The present simulation results for the airflow showed good agreement with the experimental data and the earlier numerical results. To simulate the particle dispersion and deposition in the room, particles with diameters of 10 nm–10 μm were investigated. For generating the instantaneous turbulence fluctuations for thek−ε model, the discrete random walk (DRW) method was used. Effects of SGS turbulence fluctuation on deposition rate of different size particles were also studied. It was shown that inclusion of the SGS turbulence fluctuations improves the model predictions. The simulated results for particle dispersion and deposition showed that the predictions of the present method are quite similar to the earlier finite volume method and are in good agreement with the experimental data. •Using the LBM, the indoor airflow and particle dispersion was studied.•The LBM results were compared with the available experimental measurements and the finite volume simulations.•The LBM method was found to be reasonably accurate for simulation of indoor airflow.•The method also showed good accuracy for prediction of particle dispersion and deposition.