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[snappyHexMesh] surfaceFeatureExtract error- Feature line extraction?

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Old   July 1, 2019, 12:51
Default surfaceFeatureExtract error- Feature line extraction?
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anu
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Hi everyone,
I'm attempting to run surfaceFeatureExtract on an STL file, but keep running into an error. I'll attach the full readout:
Quote:

/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 6
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
Build : 6-e29811f5dff8
Exec : surfaceFeatureExtract
Date : Jul 01 2019
Time : 12:46:02
Host : "MechE519B"
PID : 30206
I/O : uncollated
Case : /home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Reading surfaceFeatureExtractDict

Surface : "deltaPlate.stl"


Feature line extraction is only valid on closed manifold surfaces.
Statistics:
Triangles : 8
Vertices : 8
Bounding Box : (0 -1.38778e-14 -5.55112e-14) (178.205 108.66 100)


Constructing feature set from included angle 120
Selecting edges purely based on geometric tests: no

Initial feature set:
feature points : 8
feature edges : 12
of which
region edges : 6
external edges : 6
internal edges : 0


Final feature set:
points : 8
of which
convex : 2
concave : 0
mixed : 6
non-feature : 0
edges : 12
of which
external edges : 6
internal edges : 0
flat edges : 0
open edges : 6
multiply connected : 0

Writing extendedFeatureEdgeMesh to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate.extendedFeatureEdgeMesh"

Writing extendedEdgeMesh components to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate"
Writing convex feature points to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_convexFeaturePts.obj"
Writing concave feature points to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_concaveFeaturePts.obj"
Writing mixed feature points to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_mixedFeaturePts.obj"
Writing mixed feature point structure to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_mixedFeaturePtsStructure.obj"
Writing external edges to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_externalEdges.obj"
Writing internal edges to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_internalEdges.obj"
Writing flat edges to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_flatEdges.obj"
Writing open edges to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_openEdges.obj"
Writing multiple edges to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_multipleEdges.obj"
Writing region edges to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_regionEdges.obj"
Writing edge directions to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/extendedFeatureEdgeMesh/deltaPlate_edgeDirections.obj"

Writing featureEdgeMesh to "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/triSurface/deltaPlate.eMesh"

Surface : "surface2.nas"


Feature line extraction is only valid on closed manifold surfaces.


--> FOAM FATAL ERROR:
Cannot read "/home/anu/OpenFOAM/anu-6/run/deltaPlate/snappyDelta/constant/triSurface/surface2.nas"

From function bool Foam::triSurface::read(const Foam::fileName&, const Foam::word&, bool)
in file triSurface/triSurface.C at line 304.

FOAM exiting


Is my STL file incompatible, or does it have to do with my surfaceFeatureExtractDict?
I will attach both my STL file and dict file to this post.
I'd appreciate any help! Thanks so much.
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Old   July 1, 2019, 21:44
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Hi,

Assuming it is the same dictionary as the one you posted here Error: Feature line extraction is only valid on closed manifold surfaces?, then it is simply a matter of you removing unnecessary lines in the surfaceFeatureExtractDict.

Always pay attention to the error messages. Here your error message is about the missing file surface.nas. So unless you have and need a surface.nas file, there is no point including this. Remove all entries except the one for your STL file and it should be fine.

Also, since it looks like you found a solution to Error: Feature line extraction is only valid on closed manifold surfaces?, in everyone's best interests, please post your solution. Otherwise someone else running into the same issues will be left scratching their head.

Hope this helps.

Cheers,
Antimony
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Old   July 2, 2019, 10:43
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anu
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Ah, thank you so much! Silly error on my part. And yes, just updating that thread right now.
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