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Numerical simulation of the high–frequency oscillatory ventilation in generic models of the human airways

Feldmann, Daniel und Wagner, Claus (2011) Numerical simulation of the high–frequency oscillatory ventilation in generic models of the human airways. 7th International Symposium on Turbulence and Shear Flwo Phenomena (TSFP-7), 28. - 31. July 2011, Ottawa, Canada.

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Offizielle URL: http://www.tsfp7.org/papers.php

Kurzfassung

To improve the understanding of the gas transport mechanisms under conditions of high-frequency oscillatory ventilation (HFOV) we perform numerical simulations of the unsteady flow in simplified models of the human airways using time varying Dirichlet boundary conditions (BC) for the pressure. The flow fields in a generic trachea show excellent agreement with the analytical solution with an average absolute deviation of less than 10^2 for non-dimensional frequencies up to Wo=14. Nonetheless, the computational effort increases for high Wo simulations due to a long relaxation phase and strong velocity gradients near the wall despite of relatively low Reynolds numbers. We also simulated the flow within an endo-tracheal tube comprising turbulent as well as laminar flow behaviour throughout the oscillation cycle. Finally, we used the Dirichlet pressure BCs on multiple open outlets at symmetric bifurcation and three-generation airway models, while guaranteeing mass conservation. 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 (e.g. pendelluft).

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Numerical simulation of the high–frequency oscillatory ventilation in generic models of the human airways
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Feldmann, Danieldaniel.feldmann@dlr.de
Wagner, Clausclaus.wagner@dlr.de
Datum:2011
Referierte Publikation:Nein
In ISI Web of Science:Nein
Seitenbereich:Seiten 1-6
Name der Reihe:Conference Proceedings online
Status:veröffentlicht
Stichwörter:Bio-Fluid Dynamics, Protective Artificial Respiration (PAR), High Frequency Oscillation Ventilation (HFOV), Numerical Simulation
Veranstaltungstitel:7th International Symposium on Turbulence and Shear Flwo Phenomena (TSFP-7)
Veranstaltungsort:Ottawa, Canada
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:28. - 31. July 2011
Veranstalter :J. K. Eaton, R. Friedrich, A. V. Johansson, N. Kasagi, H. J. Sung and S. Tavoularis
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik, L - Simulation & Validierung
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Fluidsysteme
Hinterlegt von: Daniel Feldmann
Hinterlegt am:14 Sep 2011 16:25
Letzte Änderung:12 Dez 2013 21:05

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