Message: there are elements having an angle smaller than 5 degrees

It is possible that after mesh generation, the message 'There are elements having an angle smaller than 5.000 degrees' appears:

These mesh elements could give inaccurate results. Therefore it is suitable to correct them, for instance by local mesh refinement.

To track these mesh elements, view flags will point to these mesh elements with angle < 5°. Flags can be activated via rightclicking in the graphical scene and choosing View settings for all entities > tab Misc. > Calculation info > Display arrow on small mesh elements