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Cell Formation in Cylinder Wakes at Low Reynolds Numbers
Phys. Rev. Lett. 78, 1259 – Published 17 February, 1997
DOI: https://doi.org/10.1103/PhysRevLett.78.1259
Abstract
We propose a mechanism for the previously unexplained formation of spanwise cells observed in the vortex street wake of finite-length cylindrical bluff bodies at low Reynolds numbers. It involves the spatial growth of the secondary Eckhaus instability of oblique vortex shedding, controlled by end effects, and leads to a new interpretation of observed wake frequency relations. Predictions of cell size variations and wake patterns are obtained from the phenomenological Ginzburg-Landau model, and good agreement is found with experimental observations.
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