Journal
BUILDING AND ENVIRONMENT
Volume 48, Issue -, Pages 206-214Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.buildenv.2011.09.003
Keywords
RANS turbulence models; Discrete random walk model; Particle deposition; Near-wall correction
Funding
- Research Grant Committee, Hong Kong, China [RGC GRF 526508]
- National Natural Science Foundation of China [50808133]
- Tongji University
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This study investigates the capability and accuracy of three Reynolds-Averaged Navier-Stokes (RANS) turbulence models, i.e. a Reynolds stress model (RSM), a RNG k-epsilon model, and an SST k-omega model in the prediction of particle deposition in vertical and horizontal turbulent channel flows. The particle movement was simulated using a Lagrangian-based discrete random walk (DRW) model. The performances of the three RANS turbulence models with and without near-wall turbulence corrections were evaluated. A new modification method for turbulence kinetic energy was proposed for the RNG k-epsilon model and the SST k-omega model. The results were compared with previous experimental data, empirical equation as well as simulation outcomes. It is found that the isotropic SST k-omega model and the RSM model can successfully predict the transition from the diffusion region to the inertia-moderated region. The RNG k-epsilon model with near-wall modifications can also reflect the V-shape deposition curve although without modifications it greatly over-predicts the deposition velocity and shows an almost straight deposition line. For all of the three turbulence models, application of near-wall corrections is able to improve the simulation results to different extents. (C) 2011 Elsevier Ltd. All rights reserved.
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