CFD Simulation Of A CT Scan Oral-nasal
Extrathoracic Model
Author(s)
C. Paz, E. Suárez, M. Concheiro, J. Porteiro & R. Valdés
Abstract
The study of air flow dynamics through the respiratory system is one of the leastresearched
areas in the biofluid field. Computational fluid dynamics (CFD) has
become an essential tool for analysing the airway flows due to the complex
geometries involved. In this research a full process for obtaining the CFD
simulation results from a CT scan has been developed. The complete
extrathoracic oro-nasal airways, and the upper tracheobronchial region, have
been studied in this research. The nasal route up to the trachea was obtained from
CT images of a healthy woman, with the help of the free medical reconstruction
software InVesalius. The oral cavity and lower airways were modelled from
previous bibliographic geometry. The stereolithography file extracted from the
scan was joined in a CAD program together with the other geometry and
included the outer surface of a person and a far wall to simulate more realistic
breathing conditions. The meshing process was performed with Gambit and
Tgrid, and simulations were done with the Ansys solver Fluent. The velocity and
pressure fields were calculated for the entire range of physiological capacity. The
flow behaviour and respiratory effort under different breathing conditions were
analysed. The volume airflow and pressure drop curves through oral and nasal
routes were compared at difference activity levels. Interesting behaviours were
found when comparing different breathing pattern results, and the importance of
using a realistic geometry was demonstrated. This study has also provided the
basis for the development of simulations starting from scanner data for future
research. Some technical aspects in automated scan reconstruction still need to
be resolved before this process become a standard tool for rhinology
Keywords: oral-nasal, CFD, extrathoracic model, airways, far condition.
Keywords
Keywords: oral-nasal, CFD, extrathoracic model, airways, far condition.
Related Book
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