Figure 9. Summary of the Rankine vortex binary interaction regimes as a function of the dimensionless gap A/Rl, and the vorticity strength ratio 7 = /C2 for the radius ratios r = Rl/R2 =1/2, 1/3, and 1/4. As indicated by the code at the lower right, the structures are categorized as follows: elastic interaction (EI), merger (M), straining-out (S), tripole (T), concentric (C). The concentric regime is shadowed. (Adapted from K04.)

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