Studie proudění vzduchu během dýchacího cyklu v semi-realistickém modelu lidského tracheobronchiálního stromu

Study of airflow during respiratory cycle in semi-realistic model of human tracheobronchial tree

conference paper

en

This article deals with study of airflow under breathing process, which is characteristic by unsteady behavior. Simulations provided by computational fluid dynamics (CFD) was compared with experiments performed on similar geometry of human upper airways. This geometry was represented by mouth cavity of realistic shape connected to an idealized tracheobronchial tree up to fourth generation of branching. Commercial CFD software Star-CCM+ was used to calculate airflow inside investigated geometry and method of Reynolds averaging of Navier-Stokes equations was used for subscribing the turbulent behavior through model geometry. Conditions corresponding to resting state were considered. Comparisons with experiments were provided on several points through trachea and bronchial tree and results with respect to inspiratory and respiratory part of breathing cycle was discussed.

Tento článek se zabývá studií proudění vzduchu během jednoho dýchacího cyklu, který je charakteristický nestabilitou v chování. Počítačová simulace provedená metoudou výpočetní mechaniky tekutin (CFD) byla porovnána s experimenty provedenými na totožné geometrii zjednodušených horních cest dýchacích. Tato geometrie sestávala z ústní dutiny realistického tvaru připojené k idealizovanému tracheobronchiálnímu stromu do čtvrté generaci větvení. Komerční software Star-CCM+ byl použit pro výpočet proudění vzduchu uvnitř zkoumané geometrie. Turbulence byla simulována metodu Reynoldsova průměrování Navierových-Stokesových rovnic. Řešený stav dýchání odpovídal podmínkám za klidového stavu. Srovnání s experimenty bylo provedeno v několika bodech průdušnice a bronchiálního stromu a výsledky s ohledem na inspirační a respirační část dýchacího cyklu byly komentovány.

This article deals with study of airflow under breathing process, which is characteristic by unsteady behavior. Simulations provided by computational fluid dynamics (CFD) was compared with experiments performed on similar geometry of human upper airways. This geometry was represented by mouth cavity of realistic shape connected to an idealized tracheobronchial tree up to fourth generation of branching. Commercial CFD software Star-CCM+ was used to calculate airflow inside investigated geometry and method of Reynolds averaging of Navier-Stokes equations was used for subscribing the turbulent behavior through model geometry. Conditions corresponding to resting state were considered. Comparisons with experiments were provided on several points through trachea and bronchial tree and results with respect to inspiratory and respiratory part of breathing cycle was discussed.

Proudění vzduchu, CFD, plíce, dýchací cyklus

Airflow, CFD, Lungs, Respiratory cycle

27.04.2016

American Institute of Physics Inc.

978-0-7354-1402-0

0094-243X

APPLICATION OF EXPERIMENTAL AND NUMERICAL METHODS IN FLUID MECHANICS AND ENERGY 2016: XX ANNIVERSARY OF INTERNATIONAL SCIENTIFIC CONFERENCE

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