Can a flow created by a fan show an Edge effect when hitting a wall?

[T C]

I am curious to see the velocity and pressure distribution part of this scenario. And, by the way, what's the source of this photo/drawing?

 

[renormalize]

And, by the way, what's the source of this photo/drawing?

Here's the link to the published paper containing the second drawing as part of Fig. 5a:
Two-dimensional steady flow over a semi-circular cylinder: drag coefficient and Nusselt number
If you search this title on Google Scholar you can find a PDF version of the paper.