Large eddy and detached eddy simulations of fluid flow and particle deposition in a human mouth–throat

Fluid flow was simulated in a human mouth–throat model under normal breathing conditions (30 l/min) alternatively employing RANS k–ωk–ω (without near-wall corrections), DES and LES methods. To test the validity of the fluid phase simulations, PIV measurements were carried out in a central sagittal plane of an identical model cast. Velocity and kinetic-energy profiles showed good quantitative agreement of experiments with LES/DES, and less so with RANS k–ωk–ω. Mouth–throat deposition was simulated for particle diameters 2, 4, 6, 8 and 10μm. By comparison with existing experimental data, LES/DES showed considerable improvement over the RANS k–ωk–ω model in predicting deposition for particle sizes below 5μm. For the bigger particles, RANS k–ωk–ω and LES/DES methods produced similarly good predictions. It is concluded that for the simulation of medication aerosols inhaled at a steady flow rate of 30 l/min, LES and DES provide more accurate results than the RANS k–ωk–ω model tested.