630801.fig.0013a
(a) L/D = 20
630801.fig.0013b
(b) L/D = 30
630801.fig.0013c
(c) L/D = 40
630801.fig.0013d
(d) L/D = 50
Figure 13: Instantaneous vorticity contours for flows past a square cylinder at different outlet boundary locations for Re = 51, l = 12.5D: (a) L/D = 20, (b) L/D = 30, (c) L/D = 40, and (d) L/D = 50.