In this paper the Lattice Boltzmann method (LBM) in conjunction with the large eddy simulations (LES) and Reynolds Averaged NaviereStokes (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 shearimproved Smagorinsky model (SISM). The airflow was also simulated using the kε 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 e10 mm were investigated. For generating the instantaneous turbulence fluctuations for thekε 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.
کلید واژگان :LBM, LES, kε, SISM, Particle dispersion and deposition, Discrete random walk method
ارزش ریالی : 600000 ریال
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