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    On quasi-steady laminar flow separation in the upper airways

    Access Status
    Fulltext not available
    Authors
    Van Hirtum, A.
    Cisonni, Julien
    Pelorson, X.
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Van Hirtum, A. and Cisonni, J. and Pelorson, X. 2009. On quasi-steady laminar flow separation in the upper airways. Communications in numerical methods in engineering. 25 (5): pp. 447-461.
    Source Title
    Communications in numerical methods in engineering
    DOI
    10.1002/cnm.1195
    ISSN
    1069-8299
    School
    Department of Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/20708
    Collection
    • Curtin Research Publications
    Abstract

    Accurate prediction of the position of flow separation along a constriction is important to model fluid-structure interaction phenomena in the upper airways such as phonation and obstructive sleep apnea. Flow assumptions underlying common flow descriptions along the upper airways are formulated. Flow separation positions obtained from theories with different degrees of complexity are qualitatively and quantitatively discussed. In particular, geometrical and flow features determining the influence of viscosity are varied. Increasing the constriction degree and the constriction length is shown to affect the position of flow separation. Boundary layer solutions and simulations with the two-dimensional Navier Stokes equations result in an accurate quantitative prediction of flow separation. Furthermore, Jeffery-Hamel flow solutions qualitatively predict the effect of both constriction height and length on the position of flow separation. The ad hoc assumption applied in quasi-one-dimensional flow descriptions does not accurately predict flow separation. Copyright © 2008 John Wiley & Sons, Ltd.

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