FIG. 17.

Evolution of the non-dimensional out-of-plane vorticity for B1L and B2L with W/D = 1 (An = 0.57) and W/D = 2 (An = 1.14), respectively, at PI = 0.57 during different time instants in a cycle. The red dot shows the time instant on the flow curve for rows (a)-(f). Dashed lines and the cross sign depict the vortex structure and its axis in the right outlet, respectively, determined based on Burgers’ model. R2 depicts the vortex ring, which is observed in both cases, i.e., even at An < 1 defined based on the specific definition of An by Le et al.⁴