This 2D case of vortex shedding in laminar cross-flow demonstrates the
concept of recurrence.
This is a bit work-in-progress: please check whether this tutorial runs with
the recurrence model and tools of CFDEMcoupling, namely rStatAnalysis.
The simulation roughly goes through three stages:
* The initial solution computed by potentialFoam
* A period of symmetric, steady-state flow
* Finally, periodic vortex shedding
These three stages are clearly visible in the recurrence plot.
* We see how not one of the later velocity fields is similar to the initial one
* We see the intermediate stage with a symmetric flow field
* We see the periodic vortex shedding
