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sudo March 13, 2013 18:41

Importing mesh files to OpenFOAM: is obj format viable?
Ok, so first of all I'm still a newbie in the whole CFD realm. For importing & exporting meshes into and from OpenFOAM, I have two questions:

1. Is the obj format a viable format to carry 3D mesh data?
2. If it is, then how (and I will need detailed instructions :D) do I import a mesh in obj format to OF?
3. If it is only for surface meshes, could I still import it to OF, then use snappyhexmesh to do the volume meshing?

Reason I'm asking is that I can import mesh files from CCM+ (I know about the conversion tool, but that's for another thread) as wrl files that Mesh lab recognizes, and then does import it to obj.

Thanks in advance.

JR22 March 13, 2013 21:09

Check the motorbike tutorial ($FOAM_TUTORIALS/incompressible/simpleFoam/motorBike/ directory)

It pools the geometry from zipped .obj (motorBike.obj.gz) file in the "$FOAM_TUTORIALS/resources/geometry" directory.

After it is copied by the "Allrun" script into the trimesh directory, the snappyHexMesh calls it:


        type triSurfaceMesh;
        name motorBike;

        type searchableBox;
        min (-1.0 -0.7 0.0);
        max ( 8.0  0.7 2.5);

sudo March 15, 2013 10:07

Thanks, I'll try that and report. I just want to mention that by comparing the mesh properties on the obj & wrl files with those from the original sim file, it is clear that the imported meshes on both wrl & obj files have way less elements indicating they are only surface meshes.

cutter March 5, 2014 06:14

Some external tools require the STL file format. Use the OF tool surfaceConvert to convert between a variety of formats when necessary.


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