TY - JOUR
T1 - Numerical Simulations of High Frequency Respiratory Flows in 2D and 3D Lung Bifurcation Models
AU - Chen, Zixi
AU - Shamini, PARAMESWARAN
AU - Hu, Yingying
AU - He, Zhaoming
AU - Parameswaran, Sivapathasund
PY - 2014/6/12
Y1 - 2014/6/12
N2 - To better understand the human pulmonary system and optimize the high frequency oscillatory ventilation (HFOV) design, numerical simulations were conducted under normal breathing frequency and HFOV condition using a CFD code Ansys Fluent and its user-defined C programs. 2D and 3D double bifurcating lung models were created, and the geometry corresponds to fifth to seventh generations of airways with the dimensions based on the Weibel’s pulmonary model. Computations were carried out for different Reynolds numbers (Re=400 and 1000) and Womersley numbers (α=4 and 16) to study the air flow fields, gas transportation, and wall shear stresses in the lung airways. Flow structure was compared with experimental results. Both 2D and 3D numerical models successfully reproduced many results observed in the experiment. The oxygen concentration distribution in the lung model was investigated to analyze the influence of flow oscillation on gas transport inside the lung model.
Keywords-HFOV, lung bi
AB - To better understand the human pulmonary system and optimize the high frequency oscillatory ventilation (HFOV) design, numerical simulations were conducted under normal breathing frequency and HFOV condition using a CFD code Ansys Fluent and its user-defined C programs. 2D and 3D double bifurcating lung models were created, and the geometry corresponds to fifth to seventh generations of airways with the dimensions based on the Weibel’s pulmonary model. Computations were carried out for different Reynolds numbers (Re=400 and 1000) and Womersley numbers (α=4 and 16) to study the air flow fields, gas transportation, and wall shear stresses in the lung airways. Flow structure was compared with experimental results. Both 2D and 3D numerical models successfully reproduced many results observed in the experiment. The oxygen concentration distribution in the lung model was investigated to analyze the influence of flow oscillation on gas transport inside the lung model.
Keywords-HFOV, lung bi
M3 - Article
JO - International Journal for Computational Methods in Engineering Science & Mechanics
JF - International Journal for Computational Methods in Engineering Science & Mechanics
ER -