A DNS study of dispersion and deposition of particles in turbulent particle-laden channel flow – Effect of grid resolution

Direct numerical simulations of airflow with different grid resolutions and Lagrangian particle tracking were performed to investigate the particle dispersion and deposition in a turbulent channel flow. Different test cases with particles Stokes numbers varying from 2 to 100 were simulated.  The upward and downward flow configurations were considered for each case. The Saffman lift force is implemented in the in-house Eulerian-Lagrangian solver, and the importance of shear lift on particle dispersion and deposition was assessed. Fluid and particle statistics include the mean and fluctuating velocity profiles for fluid and particles, the average concentration of different size particles, and the particle deposition velocities were presented. The particles deposition velocities for different cases were validated against the available experimental data.  Particular attention was given to the influence of grid resolution on particle deposition.