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Updated: Aug 11, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
Published on: July 19, 2016
Stable stationary vortices and traveling oscillatory vortices in a stenotic fluid-flow channel
David W Pravica1, Martin Bier, Robert S Brock
1Department of Mathematics, East Carolina University, Greenville, North Carolina 27858, USA.
Abstract:
A shearing zonal flow of viscous fluid near a boundary perturbation can generate vortices that either remain attached near the boundary or detach to be abruptly carried downstream. At low speed a stationary attached vortex develops downstream from the perturbation. At higher speeds an array of traveling vortices forms, with successive rolls rotating in opposite directions. This report presents a quantitative explanation of vortex generation. We consider a setup that leads to a straightforwardly analyzable, Schrödinger-type equation. In the case of bloodflow through arteries the aforementioned traveling vortices are detectable as oscillations in the 1-100 Hz range. The detection of such oscillations is simple and is used to diagnose arterial stenosis.
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