Particle Dispersion in Large-Eddy Simulations: Influence of Reynolds Number and of Subgrid Velocity Deconvolution

Particle dispersion in turbulent channel flow is investigated through Lagrangian tracking of inertial pointwise particles one-way coupled to the fluid. First, the results obtained in direct numerical simulations at two different shear Reynolds numbers, Re-tau(l) = 150 and Re-tau(h) = 300, for particles having different inertia are briefly summarized and the Reynolds number effects are discussed. Then, particle dispersion in LES flow fields at Re-tau(h) is compared to reference DNS data. Comparison is made with and without approximate deconvolution of the LES fluid velocity field in the particle motion equations. It is found that particle segregation and, consequently, near wall accumulation are underestimated in LES, although approximate deconvolution improves the agreement with DNS. These findings confirm those of analogous previous studies at Re-tau(l).