Hey @mde_mendon_a_d,
These residual plots are indeed not looking very good. But the wing’s angle of attack is quite high aswell, 45 degrees.
In your first simulation, the mesh is a bit weird. Apparently you assigned a region refinement covering only 2/3 of the wingspan.
Take a look at the following sessions of the aerospace workshop: optimization of a wing - meshing and optimization of a wing - set up. You’ll find the general workflow here. In case of any doubts, please make another post 