Simulation of Pharyngeal Airway Interaction with Air Flow Using Low-Re Turbulence Model

• Published in: Modelling and Simulation in Engineering Vol. 2011; no. 2011; pp. 258 - 266
• Main Authors: Rasani, M. R., Inthavong, Kiao, Tu, Jiyuan
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Limiteds 01.01.2011; Hindawi Puplishing Corporation; Hindawi Publishing Corporation; John Wiley & Sons, Inc; Hindawi Limited
• Subjects: Air flow; Airway (Medicine); Compliance; Computational fluid dynamics; Computer simulation; Computer-generated environments; Dimensional analysis; Experiments; Fluid flow; Fluid-structure interaction; Mathematical models; Methods; Pharynx; Physiological aspects; Respiration; Reynolds number; Simulation; Studies; Throat; Tongue; Turbulence; Turbulence models; Turbulent flow; Australia
• ISSN: 1687-5591; 1687-5605
• DOI: 10.1155/2011/510472

This paper aims to simulate the interaction between a simplified tongue replica with expiratory air flow considering the flow in the pharyngeal airway to be turbulent. A three-dimensional model with a low-Re SST turbulence model is adopted. An Arbitrary Eulerian-Lagrangian description for the fluid governing equation is coupled with the Lagrangian structural solver via a partitioned approach, allowing deformation of the fluid domain to be captured. Both the three-dimensional flow features and collapsibility of the tongue are presented. In addition, examining initial constriction height ranging from 0.8 mm to 11.0 mm and tongue replica modulus from 1.25 MPa to 2.25 MPa, the influence of both of these parameters on the flow rate and collapsibility of the tongue is also investigated and discussed. Numerical simulations confirm expected predisposition of apneic patients with narrower airway opening to flow obstruction and suggest much severe tongue collapsibility if the pharyngeal flow regime is turbulent compared to laminar.