Does anybody have an idea how to visualize separation at a wing section?

Separation or transition? It's easy. Plot velocity vectors near the trailing edge of section

Create a contour with three levels ranging from -1000 to 1000 m/s on the axial velocity. Two colors will appear, above and below zero. Negative values is maybe what you are looking for? kind regards

Thank you Michael. I actually have been expecting to see something that visually resembles vorticity due to separation . Anyway that you.

Andrew