My advice here would be to improve the refinements. For example, look how big the maximum element size is compared to the characteristics of the trailing edge:
What you can do here is to create a cartesian box that contains the problematic area, and add a region refinement with a very small “maximum edge length”, so the mesh is created properly. Go smaller than 0.05 on this trailing edge, otherwise it will not really help
Have a look at the different refinement options here:
Best regards,
Fillia