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Title: A numerical technique for laminar swirling flow at the interface between porous and homogenous fluid domains
Authors: Yu, P. 
Lee, T.S. 
Zeng, Y. 
Meguid, S.A.
Low, H.T. 
Keywords: Block-structured grids
Porous medium
Porous-fluid interface
Stress jump
Swirling flow
Tissue-engineering scaffold
Issue Date: 30-May-2009
Citation: Yu, P., Lee, T.S., Zeng, Y., Meguid, S.A., Low, H.T. (2009-05-30). A numerical technique for laminar swirling flow at the interface between porous and homogenous fluid domains. International Journal for Numerical Methods in Fluids 60 (3) : 337-353. ScholarBank@NUS Repository.
Abstract: There have been a few recent numerical implementations of the stress-jump condition at the interface of conjugate flows, which couple the governing equations for flows in the porous and homogenous fluid domains. These previous demonstration cases were for two-dimensional, planar flows with simple geometries, for example, flow over a porous layer or flow through a porous plug. The present study implements the interfacial stress-jump condition for a non-planar flow with three velocity components, which is more realistic in terms of practical flow applications. The steady, laminar, Newtonian flow in a stirred micro-bioreactor with a porous scaffold inside was investigated. It is shown how to implement the interfacial jump condition on the radial, axial, and swirling velocity components. To avoid a full threedimensional simulation, the flow is assumed to be independent of the azimuthal direction, which makes it an axisymmetric flow with a swirling velocity. The present interface treatment is suitable for non-flat surfaces, which is achieved by applying the finite volume method based on body-fitted and multi-block grids. The numerical simulations show that a vortex breakdown bubble, attached to the free surface, occurs above a certain Reynolds number. The presence of the porous scaffold delays the onset of vortex breakdown and confines it to a region above the scaffold. Copyright © 2008 John Wiley & Sons, Ltd.
Source Title: International Journal for Numerical Methods in Fluids
ISSN: 02712091
DOI: 10.1002/fld.1899
Appears in Collections:Staff Publications

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