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Effect of confinement on three-dimensional stability in the wake of a circular cylinder. (English) Zbl 1183.76719
Summary: This paper investigates the three-dimensional stability of the wake behind a symmetrically confined circular cylinder by a linear stability analysis. Emphasis has been placed on discussing analogies and differences with the unconfined case to highlight the role of the inversion of the von Kármán street in the nature of the three-dimensional transition. Indeed, in this flow, the vortices of opposite sign that are alternately shed from the body into the wake cross the symmetry line further downstream and they assume a final configuration which is inverted with respect to the unconfined case. It is shown that the transition to a three-dimensional state has the same space-time symmetries of the unconfined case, although the shape of the linearly unstable modes is affected by the inversion of the wake vortices. A possible interpretation of this result is given here.

76E09 Stability and instability of nonparallel flows in hydrodynamic stability
76D25 Wakes and jets
Full Text: DOI
[1] DOI: 10.1017/S0022112094004283 · Zbl 0813.76025
[2] DOI: 10.1017/S0022112007005654 · Zbl 1115.76028
[3] DOI: 10.1017/S0022112095000255 · Zbl 0842.76015
[4] DOI: 10.1017/S0022112006004058 · Zbl 1119.76325
[5] DOI: 10.1017/S0022112001004608 · Zbl 1020.76030
[6] DOI: 10.1017/S0022112006002989 · Zbl 1104.76071
[7] DOI: 10.1016/j.jfluidstructs.2007.12.011
[8] DOI: 10.1017/S0022112096002777 · Zbl 0882.76028
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[12] DOI: 10.1016/0142-727X(93)90034-K
[13] DOI: 10.1063/1.1668285 · Zbl 1186.76455
[14] DOI: 10.1017/S0022112096008750 · Zbl 0899.76129
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