discontinuous region over Vorticity contour
 

Hi, all

I've studyed 3d Wing recently
but I can't deal with some region where quantities show discontinuity especially Vorticity magnitude.

The reason I think is fine grid spacing without reasonable stretching ratio or asepct ratio.

But I want mesh refinement near wingtip, and can't change blocking strategy.

here are details of simulation.
grid generation : Icem CFD multiblock hexa
solver : fluent
Re=1.2e6
k-omega SST
node based, 2nd order, steady, AoA=8deg

Thanks in advance.