Line Integral Convolutions of Vector Fields for
2-D Unsteady Driven Cavity Problem for Reynolds 1000 and t = 0 to 30 on [0,1]^2 for 280x280 grid

Here I have used a lighter color scheme in the corners so that the vorticities are more visible

Vector fields for t1 ~ 0, t2, t3, t4

Vector fields for t5, t6, t7, t8

Vector fields for t9, t10, t11 = 30.00