My current project consists of comparing meshes with different y+ values (no layer mesh, y+=1 and y+=30) . All meshes were generated on the same aerofoil model and have identical settings and refinements. Here are some examples (shout-out to DaleKramer for the wonderful histogram program):
No layer mesh:
5 layer, y+=1 mesh:
Another 5 layer, y+=1 mesh but this one ended up closer to y+= 3:
EDIT: here’s another 5 layer mesh, y+ less then 1:
8 layer, y+=1 mesh (not the best mesh, could be improved):
1 layer, y+=30 mesh (problematic one!):
I’ve made multiple meshes with different layer thicknesses for each case and showed only the best ones above. 5/5 1 layer y+=30 meshes showed the same low speed area below the aerofoil.
My question is why is there a dramatic difference between the 1 layer mesh and all the other meshes? Is it the problem with the mesh? Would it improve if even more cells had y+ above 30?
link to the project: https://www.simscale.com/projects/kpesic045/krilo/