Jespersen and Levit computed the viscous incompressible flow about a tapered cylinder. This computation features unsteady vortex shedding at a Reynolds number of 150 based on the mid-span cylinder radius. The mesh used is wraps around the cylinder producing a radial structure that does not quite close upstream.

Streamribbons are seeded in strategic locations (and known a priori). These markers clearly display vortical structures in the flow field.

Data courtesy of NASA Ames Research Center.