Abstract
This investigation addresses simulation of flow visualization of vortical structures, accounting for both the circulation and the degree of concentration of vorticity of the vortices via the exact nonlinear solution of Stuart for an unsteady mixing layer. At a fixed value of circulation, an increased concentration of vorticity (which corresponds to decrease in the area containing most of the vorticity) actually spreads the visualization marker over an increased area of the flow. Moreover, different combinations of vorticity concentration and circulation give essentially the same flow patterns.
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Gursul, I., Rockwell, D. Effect of concentration of vortices on streakline patterns. Experiments in Fluids 10, 294–296 (1991). https://doi.org/10.1007/BF00202463
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DOI: https://doi.org/10.1007/BF00202463