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

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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 . 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 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.

Original languageEnglish
Article numberR3
Number of pages12
JournalJournal of Fluid Mechanics
Volume813
DOIs
Publication statusPublished - 25 Feb 2017

Keywords

  • bifurcation
  • vortex shedding
  • wakes

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