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Instability in three-dimensional, unsteady, stenotic flows

✍ Scribed by Francois Mallinger; Dimitris Drikakis

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
536 KB
Volume
23
Category
Article
ISSN
0142-727X

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✦ Synopsis

The paper presents a computational investigation of instabilities in pulsatile flow through a three-dimensional stenosis. The computations have been conducted using a third-order high-resolution scheme and a non-linear multigrid algorithm. The simulations reveal the existence of unstable flow throughout the pulsatile cycle. The instability is manifested by asymmetric flow patterns--though the stenosis is axisymmetric--large flow variations in the cross-sectional planes, and swirling motion in the poststenotic region. The instability leads to a strongly disturbed flow several radii downstream of the stenosis, as well as spatiotemporal fluctuations of the circumferential shear stress and vorticity.

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