Numerical Simulations Of High Frequency
Respiratory Flows In A Model Bifurcating
Lung Geometry
Author(s)
N. Valleru, S. Smirnov, J. Tan, S. Parameswaran & R. Raj
Abstract
Numerical studies of 2D cases are conducted using a CFD code FLUENT to
analyze the flow patterns and gas transport at high oscillatory frequencies
through a two-generation bifurcating lung model. The geometry corresponds to
fifth to seventh generations of airways with the dimensions based on the
Wiebel’s symmetric pulmonary model. Computations are carried out for the
Reynolds numbers Re = 400 and Re = 1000, while the Womersley number is Wo
= 4.0 and Wo = 16.0. The average mass distribution in the entire lung model is
also investigated to analyze the influence of flow frequency on the mass
diffusion efficiency. The numerical results of the current study pointed to: i) the
numerical model successfully reproduces many results observed in the
experiments; and ii) there is practically no net effect of the high frequency on the
increased mass diffusion in the bifurcation geometry. The developed numerical
model may be further used in more complicated 3D geometries and for
determining the optimal conditions for artificial lung ventilation.
Keywords: pulmonary airways, oscillatory flow, diffusion, numerical simulation,
CFD, fluid mechanics.
Keywords
pulmonary airways, oscillatory flow, diffusion, numerical simulation,
CFD, fluid mechanics.
Related Book
Other papers in this volume
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