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The effect of angular misalignment on low-frequency axisymmetric wake instability

Published online by Cambridge University Press:  20 January 2017

V. Gentile ,
B. W. van Oudheusden ,
F. F. J. Schrijer  and
F. Scarano
V. Gentile*
Affiliation:
Aerospace Engineering Department, Delft University of Technology, 2629HS Delft, The Netherlands
B. W. van Oudheusden
Affiliation:
Aerospace Engineering Department, Delft University of Technology, 2629HS Delft, The Netherlands
F. F. J. Schrijer
Affiliation:
Aerospace Engineering Department, Delft University of Technology, 2629HS Delft, The Netherlands
F. Scarano
Affiliation:
Aerospace Engineering Department, Delft University of Technology, 2629HS Delft, The Netherlands
*
†Email address for correspondence: v.gentile@tudelft.nl
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Abstract

The effect of angular misalignment on the low-frequency dynamics of the near wake of a blunt-based axisymmetric body is investigated at a Reynolds number of $Re=67\,000$. While for axisymmetric boundary conditions all azimuthal orientations of the wake are explored with equal probability, resulting in a statistical axisymmetry, an angular offset as small as $0.2^{\circ }$ is found to suppress the low-frequency large-scale behaviour that is associated with the erratic meandering of the region of reversed flow. As a result of the misalignment, the centroid of this backflow region is displaced from the model axis and remains confined around an average off-centre position. Spectral and modal analysis provides evidence that the erratic backflow behaviour occurs within a narrow angular range of deviations from axisymmetric conditions.

JFM classification

Nonlinear Dynamical Systems: Bifurcation Vortex Flows: Vortex shedding Wakes/Jets: Wakes
Type
Rapids
Information
Journal of Fluid Mechanics , Volume 813 , 25 February 2017 , R3
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Copyright
© 2017 Cambridge University Press 

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