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Coherent structures in two uniformly distorted plane turbulent wakes

机译：Coherent structures in two uniformly distorted plane turbulent wakes

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A pattern‐recognition analysis was performed on two uniformly distorted plane turbulent wakes in the far region: the first was a wake generated by a high solidity mesh strip and the second was a wake generated by a solid flat plate. We observed that the coherent structures in the porous wake are significantly different from those in the solid wake. The porous wake structures are characterized by ‘‘ejections’’ of turbulent fluid from the center of the wake. The solid wake has nearly two‐dimensional and quasi‐periodic structures with strong circulation patterns in the vertical plane. We interpret the results as showing that there is a deficit of spanwise vorticity, relative to lateral or streamwise vorticity, in the porous wake structures, as compared to the solid wake structures. It is shown that these differences have a marked effect on the mixing and entrainment in the two flows. ©1996 American Institute of Physics.

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