Video 10. Karman vortex street in the flow past a flat plate. Compare with Video 11 and notice which has a wider wake (hence greater drag). Check Flow Illustrator website for the enrichment lesson which also uses this video.
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.