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Effect of small asymmetries on axisymmetric stenotic flow

Published online by Cambridge University Press:  19 March 2013

Martin D. Griffith ,
Thomas Leweke ,
Mark C. Thompson  and
Kerry Hourigan
Martin D. Griffith*
Affiliation:
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering & Division of Biological Engineering, Monash University, Melbourne, Victoria 3800, Australia
Thomas Leweke
Affiliation:
Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE), UMR 7342 CNRS, Aix-Marseille Université, 13384 Marseille, France
Mark C. Thompson
Affiliation:
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering & Division of Biological Engineering, Monash University, Melbourne, Victoria 3800, Australia
Kerry Hourigan
Affiliation:
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering & Division of Biological Engineering, Monash University, Melbourne, Victoria 3800, Australia
*
†Email address for correspondence: martin.griffith@eng.monash.edu.au
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Abstract

Flow through axisymmetric and eccentric sinuous stenoses is investigated numerically, for Reynolds numbers up to 400. The eccentricity consists of an offset of the stenosis throat. A range of stenosis eccentricity is tested; the wake flow is found to be highly sensitive to small eccentricities in the stenosis geometry, even with stenosis offsets of the order of the machining precision of experimental test-sections. Comparisons are made between the numerically simulated flow through stenoses with small eccentricities and results from the literature of non-axisymmetric flows through nominally axisymmetric geometries. The effect of distortion to the inlet Poiseuille velocity profile is also investigated and found to have a significantly less severe effect on the downstream wake flow than geometric eccentricity.

JFM classification

Flow Control: Instability control Wakes/Jets: Separated flows Wakes/Jets: Wakes/Jets
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 721 , 25 April 2013 , R1
Copyright
©2013 Cambridge University Press

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