[Doug68]

Looking at the attached picture, this is a cross section through a mesh.
To achieve this I ran the SHM twice on the mesh with different geometry settings and refinementRegions settings as per below:

geometry

// refinementBox01
// {
// type searchableBox;
// min (2 -2 0);
// max (10 2 2);
// }

refinementBox02
{
type searchableBox;
min (4 -1 0);
max (8 1 1);
}

refinementRegions
{
refinementBox02
{
mode inside;
levels ((0.1 4));
}

// refinementBox01
// {
// mode inside;
// levels ((0.1 2));
// }

First with the bigger region and then the smaller internal region (the setting shown are from the second run).
I think I should be able to achieve the same effect in 1 run of SHM, but I've failed to get that to work so far. Any advice on how to do it?

[Antimony]

Hi,

You can try the distance option instead of inside option in your refinement region. More information can be found at (http://cfd.direct/openfoam/user-guide/snappyhexmesh/) under the "Cell splitting in specified regions" heading

Hope this helps.

Cheers,
Antimony

[Doug68]

Thanks Antimony, good to know I'll put that to use somehow for sure.