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Numerical Simulation of the Oscillatory Ventilation in Simplified Human Lung Models

Feldmann, Daniel and Wagner, Claus (2013) Numerical Simulation of the Oscillatory Ventilation in Simplified Human Lung Models. In: New Results in Numerical Experimental Fluid Mechanics VIII Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 121. Springer Verlag, Heidelberg New York Dordrecht London. pp. 591-598. ISBN 978-3-642-35679-7.

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Official URL: http://link.springer.com/chapter/10.1007/978-3-642-35680-3_70

Abstract

To improve the understanding of gas transport mechanisms under conditions of high-frequency oscillatory ventilation (HFOV), we performed numerical simulations of the unsteady flow in simplified airway geometries using time varying Dirichlet boundary conditions (BC) for the pressure. The flow in a generic trachea shows excellent agreement with the analytical solution for non-dimensional frequencies up to Wo = 14. Nonetheless, the computational effort increases with Wo due to a long relaxation phase and strong velocity gradients near the wall despite of relatively low Reynolds numbers.We also use the pressure BCs on multiple open outlets at a single bifurcation and a three-generation airway model, while guaranteeing mass conservation. By employing identical and slightly different pressure values at the distal bifurcation ends, flow fields are reproduced, similar to that occurring under conditions of uneven physiological behaviour of different lung regions.

Item URL in elib:https://elib.dlr.de/66368/
Document Type:Contribution to a Collection
Additional Information:Online ISBN: 978-3-642-35680-3
Title:Numerical Simulation of the Oscillatory Ventilation in Simplified Human Lung Models
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Feldmann, Danieldaniel.feldmann (at) dlr.deUNSPECIFIED
Wagner, Clausclaus.wagner (at) dlr.deUNSPECIFIED
Date:January 2013
Journal or Publication Title:New Results in Numerical Experimental Fluid Mechanics VIII
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:121
DOI :10.1007/978-3-642-35680-3_70
Page Range:pp. 591-598
Editors:
EditorsEmail
Dillmann, AndreasUNSPECIFIED
Heller, GerdAirbus Deutschland, Bremen, Germany
Kreplin, Hans-PeterUNSPECIFIED
Nitsche, WolfgangTU Berlin, Berlin, Germany
Peltzer, InkenBeechcraft Berlin aviation GmbH, Schönefeld, Germany
Publisher:Springer Verlag, Heidelberg New York Dordrecht London
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
ISBN:978-3-642-35679-7
Status:Published
Keywords:Bio-Fluid Dynamics, Numerical Simulation, High-Frequency Oscillatory Ventilation, Artifical Respiration
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Feldmann, Daniel
Deposited On:15 Feb 2013 14:27
Last Modified:31 Jul 2019 19:29

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