[K.O]

Hi, i used three STL files to generate mesh with sHM, but after that there were four boundaries, three of them were defined in STL files, the last boundary contains all the three boundaries mentioned before, how to remove the last boundary.


/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class polyBoundaryMesh;
location "constant/polyMesh";
object boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

4
(
allBoundary
{
type patch;
nFaces 0;
startFace 856356;
}
inlet
{
type wall;
inGroups 1(wall);
nFaces 428;
startFace 856356;
}
outlet
{
type wall;
inGroups 1(wall);
nFaces 428;
startFace 856784;
}
wall
{
type wall;
inGroups 1(wall);
nFaces 28008;
startFace 857212;
}
)

// ************************************************** *********************** //

[Antimony]

Hi,

You can run createPatch with the attached createPatchDict (I think there is a thread here that discusses that solution). And it will remove your empty boundary

Note that in your case, the reason why it will work is because the allBoundary patch has 0 faces. If it is not 0 faces, then using createPatch to remove the extra boundary will not work.

Cheers,
Antimony

[K.O]

Originally Posted by Antimony

Hi,

You can run createPatch with the attached createPatchDict (I think there is a thread here that discusses that solution). And it will remove your empty boundary

Note that in your case, the reason why it will work is because the allBoundary patch has 0 faces. If it is not 0 faces, then using createPatch to remove the extra boundary will not work.

Cheers,
Antimony

Hi, Antimony
Thanks for your advise, i've just delete the following lines in in boundary file, then it worked.
allBoundary
{
type patch;
nFaces 0;
startFace 856356;
}

but i don't know if it will lead some other problems.
And later i will try you method. thanks.

[Antimony]

Hi,

Yes, deleting it also works - but is sometimes quite dangerous. That is why I prefer to use createPatch with an empty createPatchDict.

Cheers,
Antimony

[K.O]

Originally Posted by Antimony

Hi,

Yes, deleting it also works - but is sometimes quite dangerous. That is why I prefer to use createPatch with an empty createPatchDict.

Cheers,
Antimony

Hi, Antimony

i use your createPatchDict, but there is a problem

--> FOAM FATAL IO ERROR: cannot open file
file: /home/hp/OpenFOAM/hp-2.3.1/run/pipeFlow/pipeflow_5/system/createPatchDict at line 0.   
 From function regIOobject::readStream()    
in file db/regIOobject/regIOobjectRead.C at line 87.FOAM exiting

and i see your file is version 2.2.x, and i am using 2.3.x.
if this cause the problem?
thanks.