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 language | English |
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Article number | R3 |
Number of pages | 12 |
Journal | Journal of Fluid Mechanics |
Volume | 813 |
DOIs | |
Publication status | Published - 25 Feb 2017 |
Keywords
- bifurcation
- vortex shedding
- wakes