Effect of Sub-Grid Scales on Large Eddy Simulation of Particle Deposition in a Turbulent Channel Flow

Figures & data

FIG. 1 Grid mapping for finding the fluid velocity at the particle location.

FIG. 2 Sample velocity vector plots in (a) yz-plane, (b) xy-plane, (c) xz-plane.

FIG. 3 Sample temporal average iso-vorticity contours in the yz-plane.

FIG. 4 Comparison of RMS velocities.

FIG. 5 SGS RMS fluctuation velocities.

FIG. 6 Sample time variations of filtered velocity, SGS fluctuation velocity, and simulated instantaneous velocity components at y ⁺ = 35.

FIG. 7 Comparison of particle and fluid mean streamwise velocities.

FIG. 8 RMS of particle velocity fluctuations.

TABLE 1 Particle diameters and corresponding nondimensional relaxation times used in the simulation

d (μ m)	1	3	6	11	20	30	45	60	90	130
τ^+	0.0064	0.052	0.2	0.67	2.2	4.9	11	19.6	44.2	92

FIG. 9 Variation of deposition velocity with particle relaxation time in the presence and absence of SGS effect.

FIG. 10 Variation of deposition velocity with particle relaxation time in the presence and absence of gravity force.

FIG. 11 Distribution of the initial locations of deposited particles in the x-z plane over 50 wall units of time: (a) in the absence of SGS effect, (b) with the SGS effect.