Currently, I have some pictures for visualization of 2d fluid flow of a cavity problem for four different Reynolds numbers: 100, 1000 and 5000 and 10,000. The 5000 and 10,000 ones are more interesting and also looks better since they are solved on larger grids while the other is only 10 x 10. I used Line Integral Convolutions to visualize the vector fields.
Papers I have found the most useful: