[jhanson2]

The propeller example in pimpleDyMFoam says I can write the following:
"
type triSurfaceMesh;
file "innerCylinder.obj";
regions
{
ascii
{
name innerCylinder;
}
}
"
I write a similar code that reads
"
type triSurfaceMesh;
file "Torpedo_with_Wings.obj";
regions
{
ascii
{
name Torpedo_with_Wings;
}
}
"
I get the following error
"--> FOAM FATAL ERROR:
Unknown region name ascii for surface Torpedo_with_Wings
Valid region names are 1(patch0)

From function Foam::searchableSurfaces::searchableSurfaces(const Foam::IOobject&, const Foam::dictionary&, bool)
in file searchableSurfaces/searchableSurfaces/searchableSurfaces.C at line 258.
"
I'm assuming that snappyHexMesh doesn't really know what ascii means (or any other name I put there) but I've defined it the same way the example has and it' unclear why this error is occurring.

Following the directions here
https://cfd.direct/openfoam/user-guide/snappyhexmesh/
and
https://openfoamwiki.net/index.php/SnappyHexMesh
don't give good direction about what I can put after the "{". Would anyone be able to give me direction as to what I'm doing wrong?

[Teosim]

Hi,
looks like SHM could not find a region named "ascii" in your .obj file. It also states that there is a single region named "patch0".

You could first try substituting the "ascii" entry with "patch0" in your snappyHexMeshDict or edit/regenerate your .obj file with the desired region name.

[jhanson2]

@Teosim,

Thank you. That did improve the code. Do you know why switching from "ascii" to "patch0" worked?

Unfortunately now I get the error:
"
--> FOAM FATAL IO ERROR:
Could not open "/home/jackhansonjr/OpenFOAM/openfoam5/tutorials/incompressible/pimpleDyMFoam/Torpedo/constant/triSurface/Torpedo_with_Wings.eMesh"

file: /home/jackhansonjr/OpenFOAM/openfoam5/tutorials/incompressible/pimpleDyMFoam/Torpedo/system/snappyHexMeshDict.castellatedMeshControls.features from line 94 to line 95.

From function void Foam::refinementFeatures::read(const Foam:bjectRegistry&, const Foam::PtrList<Foam::dictionary>&)
in file refinementFeatures/refinementFeatures.C at line 98.

FOAM exiting
"
I'm assuming this is because "Torpedo_with_Wings.eMesh" doesn't exist and I'm going to go through the exercise of figuring out how to make that.

[Teosim]

Hi,
the entry changed is the name of the region in the .obj file. During prior execution SHM was looking for a region named "ascii" in your .obj file and could not find it. You could check this by opening .obj file with a text editor and looking at the headers.

About next error, I guess you are right. For example you can automatically create the .eMesh files by running surfaceFeatureExtract command which reads a surfaceFeatureExtractDict in your case system directory.

If I remember correctly you could also create .obj files with edges needed for refinement, place them in constant/triSurface and change the file name and format accordingly in snappyHexMeshDictionary.