AustralieFrV1, Main, Merge, bibRecord, 008008

Convective instability in steady stenotic flow: optimal transient growth and experimental observation

Identifieur interne : 008008 ( Main/Merge ); précédent : 008007; suivant : 008009

Convective instability in steady stenotic flow: optimal transient growth and experimental observation

Auteurs : M. D. Griffith [Australie] ; M. C. Thompson [Australie] ; T. Leweke [France] ; K. Hourigan [Australie]

Source :

Journal of Fluid Mechanics [ 0022-1120 ] ; 2010.

RBID : Pascal:10-0403363

Descripteurs français

Pascal (Inist)
- Instabilité convective, Ecoulement permanent, Pathologie de l'appareil circulatoire, Vorticité, Sténose, Etude expérimentale, Simulation numérique, Visualisation écoulement, Symétrie axiale.

English descriptors

KwdEn :
- Axial symmetry, Cardiovascular disease, Convective instability, Experimental study, Flow visualization, Numerical simulation, Steady flow, Stenosis, Vorticity.

Abstract

An optimal transient growth analysis is compared with experimental observation for the steady flow through an abrupt, axisymmetric stenosis of varying stenosis degree. Across the stenosis range, a localized sinuous convective shear-layer instability type is predicted to dominate. A comparison of the shape and development of the optimal modes is made with experimental dye visualizations. The presence of the same sinuous-type disturbance immediately upstream of the highly chaotic region observed in the experimental flow is consistent with the optimal growth predictions. This, together with the fact that the flow is unstable globally only at much higher Reynolds numbers, suggests bypass transition.

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Pascal:10-0403363

Le document en format XML

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<term>Sténose</term>
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<front><div type="abstract" xml:lang="en">An optimal transient growth analysis is compared with experimental observation for the steady flow through an abrupt, axisymmetric stenosis of varying stenosis degree. Across the stenosis range, a localized sinuous convective shear-layer instability type is predicted to dominate. A comparison of the shape and development of the optimal modes is made with experimental dye visualizations. The presence of the same sinuous-type disturbance immediately upstream of the highly chaotic region observed in the experimental flow is consistent with the optimal growth predictions. This, together with the fact that the flow is unstable globally only at much higher Reynolds numbers, suggests bypass transition.</div>
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Convective instability in steady stenotic flow: optimal transient growth and experimental observation

Convective instability in steady stenotic flow: optimal transient growth and experimental observation

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri