The image shows the flow topology for a flat plate wing rotated 180 degrees about the mid chord. The experiment was conducted in a quiescent water tank, and the shear layer feeding vortices behind each plate edge is illuminated using a milk based dye and twin laser light sheets.
Formation of vortices at the edges of a rotating flat plate wing —

The image shows the flow topology for a flat plate wing rotated 180 degrees about the mid chord. The experiment was conducted in a quiescent water tank, and the shear layer feeding vortices behind each plate edge is illuminated using a milk based dye and twin laser light sheets.

https://fluids.ac.uk/pictures/competition/6-formation_of_vortices.jpg