Numerical Investigation Of The Flow Field In
The Upper Human Airways
Author(s)
G. Eitel, W. Schr¨oder & M. Meinke
Abstract
The flow in a realistic model of the human lung is numerically simulated at steady
and unsteady inspiration and expiration. A model of a human lung ranging from
the trachea down to the sixth generation of the bronchial tree is used for the
simulation. The numerical analysis is based on the Lattice-Boltzmann method,
which is particularly suited for flows in extremely intricate geometries such as the
upper human airways.
The results for steady air flow at inspiration and expiration for a diameter based
Reynolds number of ReD = 1250 evidence secondary vortex structures and air
exchange mechanisms. It is shown that the asymmetric geometry of the human
lung plays a significant role for the development of the flow field in the respiratory
system. Secondary vortex structures observed in former studies are reproduced and
described in detail.
The solutions for unsteady respiration allow a detailed analysis of the temporal
formation of secondary flow structures whereas the time dependence is much more
pronounced at inspiration than at expiration.
Keywords: computational fluid dynamics, Lattice-Boltzmann method, respiratory
system, human lung, unsteady flow.
Keywords
computational fluid dynamics, Lattice-Boltzmann method, respiratory
system, human lung, unsteady flow.
Related Book
Other papers in this volume
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