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[CAD formats] stl geometry is not close

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Old   August 16, 2014, 18:55
Unhappy stl geometry is not close
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Hello!!
I am new in the forum. I have a problem with snappyHexMesh. I make a geometry with CAD and export to .stl, buy when i run snappyHex say that the geometry is not close. I have proved different ways to make a stl file: with MeshLab, ICEM, ACAD, SolidWorks and always gave me the same error.

Here is the error:
--> FOAM FATAL ERROR:
Shell TURBINA.stl does not support testing for outside
Probably it is not closed.

From function shellSurfaces::shellSurfaces(const searchableSurfaces&, const PtrList<dictionary>&)
in file autoHexMesh/shellSurfaces/shellSurfaces.C at line 134.

The geometry is a wind turbine. First i think it was the complex of the geometry that make the error, but i made a simple cylinder an exported with ICEM and gave me the same error.

I hope you can help me.
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Old   August 29, 2014, 05:03
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Hello,

First of all, helping you without log files or the snappyHexMeshDict is nearly impossible, so upload them and I can have a look at it.

My first suggestion would be, that you are using the refinementRegions command as well.

Code:
refinementRegions
    {
        refinementBox
        {
            mode inside;   // inside;
            levels ((1.0e+15 4));  //1E15 4
        }
    }
maybe try to set this in a comment and try it again. But this is only a guess, because I don't know what you are doing exactly...

Best Regards
Mike
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Old   May 16, 2017, 08:48
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Did you found the solution to this problem.
I'm also having the same problem.
I have a ship model which cannot be closed( I don't understand the actual meaning of closed)
Shell ship.stl does not support testing for inside
Probably it is not closed.
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Old   May 16, 2017, 09:04
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Hello. I am sorry bhakar.raju98, since some years I am not any more a user of OpenFOAM, so I am outdated. Best, Ignacio!
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Old   May 17, 2017, 06:24
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Quote:
Originally Posted by bhakar.raju98 View Post
Did you found the solution to this problem.
I'm also having the same problem.
I have a ship model which cannot be closed( I don't understand the actual meaning of closed)
Shell ship.stl does not support testing for inside
Probably it is not closed.
I don't know if this helps, but I once had this problem when I had several parts in one STL and I tried to use that file in refinementRegions. There was no problems with refinementSurfaces or user defined regions.
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Last edited by KaLium; May 17, 2017 at 08:02.
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Old   May 17, 2017, 07:51
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raju ram bhakar
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Thankyou Kalium and Ignacio.

I got the solution for this problem.
We have to repair the stl file using blender or any other 3d editor and repairing means we have to make it close surface no open surfaces are allowed because we will be removing the mesh inside the surface boundary.
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Old   July 13, 2017, 12:52
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You have to use:
surfaceCheck <yourSTL>
It should output no errors.
If an error occurs, you may use
surfaceSubset surfaceSubsetDict <yourSTL> stlProblems.stl
and visualise stlProblems.stl

--
Fabien
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Old   June 24, 2020, 14:13
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Quote:
Originally Posted by bhakar.raju98 View Post
Thankyou Kalium and Ignacio.

I got the solution for this problem.
We have to repair the stl file using blender or any other 3d editor and repairing means we have to make it close surface no open surfaces are allowed because we will be removing the mesh inside the surface boundary.

Do you know how to make the stl or obj in blender with named faces. I can make a closed geometry using the 3d Printer addon, but that only applied it to a single blender object. On the other hand I can make a set of blender objects and export those to multiple stl files then name the faces as solids and combine them. Both result in open geometry. Just cannot seem to get the right setup to have both named faces and a closed manifold.
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