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Vortex pair for at . (a) Vorticity contours superimposed with streamlines in corotating frame. (b) Vorticity contour line plot.
Time development of (a) separation distance, . (b) Core size (dashed line corresponds to ). Symbols: ▷: . ◻: .
Vorticity contours with superimposed principal extensional strain (vectors indicating magnitude of eigenvalue and direction of eigenvector) for .
Contribution of flow regions (엯: inner cores, ◻: filaments, ▷: exchange band) to the change in separation distance, in Fig. 2(a), for (a) , (b) .
Vorticity contours with gray shading corresponding to production term, , for at (light gray scale: , dark gray scale: ).
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