CFD Online Discussion Forums - [snappyHexMesh] features' edges with surfaceFeatureExtract

Hi everybody,

I'm trying to enhance my mesh using the surfaceFeatureExtract tool, but I can't find a proper guide/tutorial.
I tried to use $FOAM_TUTORIALS/incompressible/pimpleDyMFoam/propeller/Allrun.pre as a guide, but I'm still having some troubles.

I managed to run surfaceFeatureExtract correctly with this command:

Code:

#!/bin/sh



surfaces="

    B0

    spiresFilippo

    block_roughness

"



for s in $surfaces; do

    surfaceFeatureExtract -includedAngle 100 constant/triSurface/$s.stl $s

done

and it generates the .extendedFeatureEdgeMesh and the .eMesh for each surface.

But then what should i do with these files?

I tried to use the .eMesh files as input for snappyHexMesh in place of the .stl, but i receive the error

Code:

unknown file extension eMesh. Supported extensions are '.ftr', '.stl', '.stlb', '.gts', '.obj', '.ac', '.off', '.nas' and '.tri'

So actually I don't know how to proceed.

Moreover in my simulation i need to have different patches for the faces of the B0 volume (it's a box-shape volume). Before using surfaceFeatureExtract I had 5 different .stl for each face that were given to snappyHex as different surfaces. This way i had five different patches.

Now, if i try to use the same five files with surfaceFeatureExtract I receive the error

Code:

Feature line extraction is only valid on closed manifold surfaces.

So how can i keep separated surfaces while using the surfaceFeatureExtract? Can i use the file with the closed volume as input for surfaceFeatureExtract and the five separate surfaces as input for snappyHexMesh?

Thank you very much for the help.

PS: I use OF v2.1, since i saw that the surfaceFeatureExtract has slightly changed from 2.1 to 2.2