Karman vortex street is one of well known fluid flow phenomena. The below youtube video (1080p[HD] is preferred) is what you can simulate with the following bc.bmp and grid.txt.
Computational time: 2 mins/1000 steps
Boundary Condition: bc.bmp
Initial Condition: —
Parameters: grid.txt
Boundary Condition: bc.bmp
Initial Condition: —
Parameters: grid.txt