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[CAD formats] How to scale the stl when importing from salome or any cad tool to openfoam

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Old   February 1, 2018, 01:16
Default How to scale the stl when importing from salome or any cad tool to openfoam
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Vishal sharma
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Hey, there i am very new to openfoam,
i just want to ask if i create a model using salome and export the stl file to be used for snappyhexmesh.
How to scale the geometry or mesh in openfoam.

Like i have created a sphere and channel in salome, my default unit display in salome is in meters, so if keep the diameter as 20 it will take it as 20m.
but in openfoam i want the sphere of 20mm.
how can i do that.
please help me in this.
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Old   February 1, 2018, 18:52
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So Salome writes in mm by default. Therefore if you want to export a sphere just keep the default units of mm.....stl files store the dimension with the file so it should know what the proper dimension is in snappy hexmesh.(as far as I know)..
I usually just make my mesh in Salome. So i compute mesh
Export the .unv

Then run transformPoints -scale (0.001 0.001 0.001)
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Old   February 1, 2018, 20:26
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You can use transformPoints like LeeRuns has mentioned - but this is works on your mesh mainly.

If you have only the surface files for example, you can use the surfaceTransformPoints utility - does the same thing as transformPoints except that this operates on surfaces.

Hope this helps.

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Old   February 2, 2018, 04:20
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Another way would probably be scaling the geometry in sHMDict file.
This should work

        type triSurfaceMesh;
        name sphere;
	scale 0.001;
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preprocessing, salome meca, snappyhexmesh 3d

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