[Chia]

Hi!

I am dealing with a complex geometry and I need to add layers only in a particular region of this geometry.

First of all, I create the background mesh and I used the snappyHexMesh dictionary to model the geometry and to add layers everywhere, except that I obtained a mesh with too many cells.
Thus I am asking if someone knows hot to create a sub-region in the .stl file in order to recall it in the addLayersControl and add layers only there. Or can I add layers in a limited region in an other way?

In other words, I wonder to be in a situation like this:

file.stl //or file.obj (with right header) //STL file name
{
type triSurfaceMesh;
name my_file; // user-assigned name
regions // definition of regions of stl
{
subregion_1 // STL-defined patch name
{
name my_first_subregion; // user-assigned patch name
}
subregion_2
{
name my_second_subregion;
}
}
}

and the addLayersControls would be

layers
{
my_first_subregion
{
nSurfaceLayers 4;
}
}

but unfortunately I don't know how to define these subregions in my stl file.

Thank you in advance,
Chiara