[snappyHexMesh] Can we separate the box geometry after making the mesh?

Bahar_ · January 13, 2020, 09:19

Hi every body

I wanted to mesh the surface of a .stl geometry using SnappyHexMesh. The problem is that I don't want to run my simulation in OpenFoam, and I only need a surface mesh with .stl format.
When I made the mesh with Snappyhexmesh, the outer box that I made for BlockMesh is with my mesh. I made the mesh from this box to the surface of my geometry, but I only need a surface mesh. Is there any way to delete the volume mesh from outer part of the geometry and also the outer box (that we draw for making the blockmesh)

Thanks a lot

GerhardHolzinger · January 14, 2020, 04:14

Quite easy with OpenFOAM's on-board tools.

Follow this workflow:

export the surface mesh
split the surface mesh

This command will create a single STL file, which contains all the different patches as STL solids.

Code:

foamToSurface surf.stl

The following command splits the STL file into several STL files, one per patch.

Code:

surfaceSplitByPatch surf.stl

Note, that the patch name will be used as a suffix.

Thus, you will end up with multiple STL files:

surf.stl - all patches in one file
surf_walls.stl - all faces belonging to the walls patch
surf_out.stl - all faces belonging to the out patch

Bahar_ · January 15, 2020, 04:56

Thanks a lot. This is exactly what I wanted.

January 13, 2020, 09:19	Can we separate the box geometry after making the mesh?	#1
Bahar_ New Member Bahar Join Date: Jan 2020 Posts: 2 Rep Power: 0	Hi every body I wanted to mesh the surface of a .stl geometry using SnappyHexMesh. The problem is that I don't want to run my simulation in OpenFoam, and I only need a surface mesh with .stl format. When I made the mesh with Snappyhexmesh, the outer box that I made for BlockMesh is with my mesh. I made the mesh from this box to the surface of my geometry, but I only need a surface mesh. Is there any way to delete the volume mesh from outer part of the geometry and also the outer box (that we draw for making the blockmesh) Thanks a lot

January 14, 2020, 04:14		#2
GerhardHolzinger Senior Member Gerhard Holzinger Join Date: Feb 2012 Location: Austria Posts: 339 Rep Power: 28	Quite easy with OpenFOAM's on-board tools. Follow this workflow: export the surface mesh split the surface mesh This command will create a single STL file, which contains all the different patches as STL solids. Code: foamToSurface surf.stl The following command splits the STL file into several STL files, one per patch. Code: surfaceSplitByPatch surf.stl Note, that the patch name will be used as a suffix. Thus, you will end up with multiple STL files: surf.stl - all patches in one file surf_walls.stl - all faces belonging to the walls patch surf_out.stl - all faces belonging to the out patch

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January 15, 2020, 04:56		#3
Bahar_ New Member Bahar Join Date: Jan 2020 Posts: 2 Rep Power: 0	Thanks a lot. This is exactly what I wanted.