[PLD]

Hi everyone,

I have been using ICEM for several years now, which also means that I have been using different versions (12, 15, 16.2) and I am currently having a problem with a very simple case on v17.1 (case that used to work fine with previous versions...).

The case is a 2D airfoil (NACA0012) hexa mesh (blocking). Geometry and blocking are created fine, but when I generate the premesh, the boundary layer at the leading edge does not show as expected (see picture Leading_Edge_v17-1). The point is that for some reason (my question), the nodes distribution specified on the edges is not used by ICEM close to the airfoil surface (see picture Leading_Edge_v17-1_close_view_1stCell). Instead, ICEM generates a layer of constant cells height and jumps back to the edge nodes distribution outside of this layer. It is impossible to control the y+ this way which is really annoying...

The same procedure (this is a tutorial) used to work fine with the previous versions (see picture Leading_Edge_v16-2; the picture shows ANSYS 17.1 only because the .uns mesh file, created with v16.2, was read in the current version I have).

The mesh is as expected at the trailing edge (see picture Trailing_Edge_v17-1) although this is not always the case according to the different tests I have carried out on other simple 2D airfoil meshes. Surprisingly, this problem does not happen when I meshed a 2D VAWT which uses a similar blocking.

I am a bit lost with this issue and do not know if this may be a bug of this version or if I did something wrong (although I have checked several times the different options/settings).

So would any of you have experienced the same problem or have an idea on how to fix it?

Many thanks for considering my message!

[PLD]

No one has experienced the same problem with ICEM v17.1?

[PLD]

Actually we just need to modify the Triangulation Tolerance (Settings > Model/Units). Set it to 1e-7 and everything should be fine.