adaptive meshing on an airfoil
 

Hello to everybody,
i am running simulations on an airfoil, the solution converges (SA turbulence model, first and second order), when examining the yplus values, i find that the trailing and leading edge have regions with yplus>1.
is it good to perform a mesh optimization?if so, where should it be performed?just on the leading, the trailing edge or both?
Is it necessary to have yplus<1 all along the airfoil?

Thank you,
Davide