[benjaminandrews38]

Hi there,

openFoam noob here, sorry in advance. I am having a problem building my mesh with salome.

combining stl files with individual patches seems to break some of the faces. please see the attached image. My workflow has been:

1. create (very simple) geometry with fusion 360 and export to step format.
2. import step file into Salome
3. create face groups for inlet,outlet,walls
4. triangulate mesh with NETGEN 2D / Wire discretization (adaptive length)
5. export groups of faces to inlet.stl, outlet.stl and walls.stl
6. combine with "cat *.stl > combined.stl"

The exported stl files look fine, but everything goes crazy in the combined file.

Any advice?

[GerhardHolzinger]

What happens if you use OpenFOAM's surfaceAdd to combine the STLs?

Usage: surfaceAdd [OPTIONS] <surface1> <surface2> <output>
Arguments:
  <surface1>        The input surface file 1
  <surface2>        The input surface file 2
  <output>          The output surface file
Options:
  -case <dir>       Specify case directory to use (instead of cwd)
  -mergeRegions     Combine regions from both surfaces
  -points <file>    Provide additional points
  -scale <factor>   Geometry scaling factor on input surfaces
  -doc              Display documentation in browser
  -help             Display short help and exit
  -help-full        Display full help and exit

Add two surfaces via a geometric merge on points. Does not check for
overlapping/intersecting triangles.

Using: OpenFOAM-v2112 (2112) - visit www.openfoam.com
Build: _14aeaf8dab-20211220
Arch:  LSB;label=32;scalar=64

[benjaminandrews38]

Similar result unfortunately, although it seems to be translating different nodes.

I think the problem is Salome. I've just tried importing the merged file to fusion 360 and it displays perfectly.