Influence of Morphological Parameters on the Flow Development within Human Airways

Anatomical airways parameters, such as length, diameter and angles, have a strong effect on the flow dynamics. Aiming to explore of variations bifurcation angle (BA) carina rounding radius (CRR) lower human respiratory processes, numerical simulations airflow during inhalation exhalation were performed using synthetic models. Geometries for models parameterized based set different BA’s several CRR’s. A range Reynolds numbers (Re), relevant breathing process, selected analyze behavior. The results showed significant influence BA CRR development within airways, and, therefore, affecting following features flow: deformation velocity profiles, alterations pressure drop, patterns, finally, enhancement or attenuation wall shear stresses (WSS) appearing regular process. that increases in value accompanied by about 20%, especially regions close bifurcation. Similarly, led reduction peak up 70%. For ranges angles radii explored, an increase 20% stress more than 400% obtained increasing radius. Analysis coherent structures secondary patterns also revealed direct relationship between location vortical structures, local maxima profiles vorticity minima. This was observed all branches analyzed, both processes cycle.