Video 7. This flow has a section where the fluid flows backwards, but this flow is not separated.
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
These videos, all available on YouTube, are demonstrated in the introductory lecture for the module on separated flows, MSc in Advanced Computational Methods for Aeronautics, Department of Aeronautics, Imperial College London.