LES and DES Study of Fluid-Particle Dynamics in a Human Mouth-Throat Geometry
A CT based simplified upper human airway model was created by preserving all critical geometrical features. The fluid flow at a normal breathing flow rate of 30 l/min is numerically studied employing RANS, DES and LES methods. The complex flow patterns with skewed velocity profiles and flow separations are discussed for the LES model. The deposition efficiency and the deposition patterns for the particle diameters 2, 4, 6, 8 and 10 μm are presented. For particle diameters in the respirable range, LES and DES showed considerable improvement over the RANS model, however, for the particles above 5 μm, RANS performs as good as LES/DES. The frozen LES method for particle tracking consistently underestimated the deposition of bigger particles.
KeywordsReynolds Average Navier Stokes Reynolds Average Navier Stokes Stokes Number Aerosol Deposition Reynolds Stress Model
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