[adrieno]

Hi all,

As I said in the title, I'am trying to make a geometry (a simple cube) on Gmsh then to mesh around this cube in a bigger box with snappy. I've seen that it is possible but I couldn't make it for the moment...

My problem comes from my geometry in ( .stl ). Snappy run very well and mesh all my domain (as my geometry didn't exist).

And actually my geometry didn't exist.... my .stl in empty (I linked it, just remove the .txt).

I think that comes from the fact that when I save it, the .stl extension seems to concerned only the mesh, not the geometry (I've posted a photo) whereas I didn't create any mesh...

Should I create a mesh inside my cube with Gmsh which will not been use after because snappy will mesh outside the cube in order just to "shape the geometry" ?

Thank you for any help,

Adrien

[adrieno]

Hi again,
I've define a mesh with Gmsh (just a single hexahedral cell to make my cube) before saving my file in .stl. Now, when I'm importing this geometry it seems to work fine, snappy is meshing all around my cube.

BUT, there is a but... As you can see in the picture, snappy doesn't fit perfectly the cube... what is it due to ?

• Is it still a geometry problem (from my .stl file, because I wasn't suppose to make it like that) ,
• or is it something about my snappyHexMeshDict that I have to adjust now ?

Have a nice day

[adrieno]

Hi all,
My problem was coming from my snappyHexMeshDict:

replacing

cube.stl
        {
            // Surface-wise min and max refinement level
level (3 4);
        }

by

cube.stl
        {
            // Surface-wise min and max refinement level
level (4 4);
        }

Well, that's the end for this topic I think...
Have a nice day, and good luck for your project

[Antimony]

Hi,

If you want to capture the edges of the cube, you could also increase the feature refinement. Take note that you would need to have an eMesh for this before you run snappy. The eMesh file can be obtained from the surfaceFeatureExtract command.

Cheers,
Antimony