[caja94]

Hello guys, I am a beginner at using OpenFoam and Gmsh, and I have one problem.


For my master thesis, I wanted to create an air duct with heat source, and 2 plates that partially close air duct's cross-section. I used Gmsh for creating geometry, and everything works fine, except baffles. Here's what I want to get:





Plate1 is there, but it's invisible from this point of view. This is done in PHOENICS.


Now, I created geometry in Gmsh, and then I created a mesh. After that, I imported that mesh file in OpenFoam, and I tried to create 2 baffles that I need. For that I followed this youtube tutorial:
https://www.youtube.com/watch?v=7Ex1RHDQqIc


I have 2 plates, named Plate1 and Plate2. Here is my baffleDict file:

FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      createBafflesDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

internalFacesOnly true;

baffles
{
    baffleFaces
    {
        type        faceZone;
        zoneName    Plate1;
        flip        false;
    
        patches
        {
            master
            {
                name            Plate1;
                type            wall;
            }
            slave { ${..master} }
        }
    }
}

baffles
{
    baffleFaces
    {
        type        faceZone;
        zoneName    Plate2;
        flip        false;
    
        patches
        {
            master
            {
                name            Plate2;
                type            wall;
            }
            slave { ${..master} }
        }
    }
}

Also, here's my boundary file:

FoamFile
{
    version     2.0;
    format      ascii;
    class       polyBoundaryMesh;
    location    "constant/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

9
(
    Front
    {
        type            empty;
        physicalType    empty;
        nFaces          1380;
        startFace       2662;
    }
    Bottom
    {
        type            patch;
        physicalType    patch;
        nFaces          50;
        startFace       4042;
    }
    Plate1
    {
        type            wall;
        physicalType    wall;
        nFaces          0;
        startFace       4092;
    }
    HeatSource
    {
        type            patch;
        physicalType    patch;
        nFaces          32;
        startFace       4092;
    }
    Back
    {
        type            empty;
        physicalType    empty;
        nFaces          1380;
        startFace       4124;
    }
    Outlet
    {
        type            patch;
        physicalType    patch;
        nFaces          18;
        startFace       5504;
    }
    Inlet
    {
        type            patch;
        physicalType    patch;
        nFaces          16;
        startFace       5522;
    }
    Plate2
    {
        type            wall;
        physicalType    wall;
        nFaces          0;
        startFace       5538;
    }
    Top
    {
        type            patch;
        physicalType    patch;
        nFaces          80;
        startFace       5538;
    }
)

After I run createBaffles command, I get this:

createBaffles -case proba1 -dict system/baffleDict -overwrite
/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  6
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
Build  : 6-e05f780ebc87
Exec   : createBaffles -case proba1 -dict system/baffleDict -overwrite
Date   : Oct 06 2018
Time   : 10:21:12
Host   : "Petar"
PID    : 14881
I/O    : uncollated
Case   : ./proba1
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

Create mesh for time = 0

Reading baffle criteria from createBafflesDict

Not converting faces on non-coupled patches.

Created zone baffleFaces at index 2 with 12 faces
Patch 'Plate2' already exists.  Only moving patch faces - type will remain the same
Patch 'Plate2' already exists.  Only moving patch faces - type will remain the same
Converted 12 faces into boundary faces in patches 1(Plate2)

--> FOAM Warning : 
    From function int main(int, char**)
    in file createBaffles.C at line 854
    Setting field on boundary faces to zero.
You might have to edit these fields.

Removing zero-sized patches:
    Plate1 type wall at position 2

Writing mesh to 0
End

Now, when I run paraFoam, I see the problem that shows at the line "Removing zero-sized patches: Plate1 type wall at position 2"





Then, I tried changing startFace for Plate1 to the last face, as said in tutorial, but I get this error:

Create time

Create mesh for time = 0

Reading baffle criteria from createBafflesDict

Not converting faces on non-coupled patches.

Created zone baffleFaces at index 2 with 12 faces
Patch 'Plate2' already exists.  Only moving patch faces - type will remain the same
Patch 'Plate2' already exists.  Only moving patch faces - type will remain the same


--> FOAM FATAL ERROR: 
Problem : Patch Plate1 starts at 5618
Current face counter at 4092
Are patches in incremental order?

    From function void Foam::polyTopoChange::addMesh(const Foam::polyMesh&, const labelList&, const labelList&, const labelList&, const labelList&)
    in file polyTopoChange/polyTopoChange/polyTopoChange.C at line 2451.

FOAM aborting

#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::error::abort() at ??:?
#2  Foam::polyTopoChange::addMesh(Foam::polyMesh const&, Foam::List<int> const&, Foam::List<int> const&, Foam::List<int> const&, Foam::List<int> const&) at ??:?
#3  Foam::polyTopoChange::polyTopoChange(Foam::polyMesh const&, bool) at ??:?
#4  ? in "/opt/openfoam6/platforms/linux64GccDPInt32Opt/bin/createBaffles"
#5  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#6  ? in "/opt/openfoam6/platforms/linux64GccDPInt32Opt/bin/createBaffles"
Aborted (core dumped)

I also tried matching startFaces for Plate1 and Plate2, but the only time i can actually run createBaffles command successfully is when Plate1 startFace matches that from the first file.

I also uploaded entire case file here: https://ufile.io/8qi1z


fvSchemes, fvSolutions etc. are there just because I couldn't export from Gmsh to OF without them, I didn't work on them yet.


I hope you guys can help me, it would be much appreciated. Thank you in advance.

[caja94]

Hi guys, I managed to resolve this problem by going back to gmsh and putting both plates in 1 physical group, thus making my problem a lot easier. Before this thread is closed, can anyone tell me if solving this problem the way I did will have any effect when I try to get my case to work?



Thanks a lot.