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    Analysis of pulsatile flow in a separated flow region

    Access Status
    Fulltext not available
    Authors
    Salek, M.
    Dol, Sharul sham
    Martinuzzi, R.
    Date
    2009
    Type
    Conference Paper
    
    Metadata
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    Citation
    Salek, M. and Dol, S.S. and Martinuzzi, R. 2009. Analysis of pulsatile flow in a separated flow region, pp. 1429-1438.
    Source Title
    Proceedings of the ASME Fluids Engineering Division Summer Conference 2009, FEDSM2009
    DOI
    10.1115/FEDSM2009-78302
    ISBN
    9780791843727
    School
    Curtin Sarawak
    URI
    http://hdl.handle.net/20.500.11937/10998
    Collection
    • Curtin Research Publications
    Abstract

    A Backward-Facing Step (BFS) is widely used as an in-vitro model to investigate the influence of flow separation and recirculation observed in biomedical devices, arterial bifurcations and stenoses. In this study we numerically investigate the flow over a BFS with an expansion ratio of 2 and pulsed velocity at the inlet. The main objective is to study the effects of oscillation frequency and amplitude on flow evolution and interaction between vortices. The pulsatile flow leads to a breakdown of the primary recirculation vortex and the generation of a secondary upper wall instability at lower Reynolds numbers than in the steady case. The results show that the amplitude coefficient plays a dominant role in the primary vortex formation but the frequency determines the amount of circulation convected downstream. Copyright © 2009 by ASME.

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