[priyankap]

Hello Everyone,


My geometry consists of three regions (hot, cold and pipe). And I want to generate a heat source on one face of the "hot" box/region.



I created mesh in salome and then importing my UNV file to Openfoam using ideasUnvToFoam utility. And to create regions, I used splitMeshRegions command in command line. Following are the commands I used:

ideasUnvToFoam heat_transfer.unv | tee log.ideasUnvToFoam
splitMeshRegions -cellZones -overwrite | tee log.splitMeshRegions

To use just one face of the box as a heat source, I need to use cellSet option in my FvOptions file. I read on forum that I must use topoSet to create cellSet, but I don't know how to do this when I don't have a blockMeshDict file? The version of my openFoam is 4.1.



Can anyone please guide me how to do this? It would be a great help.


Thank you.

[Antimony]

Hi,

You do not need a blockMeshDict file in order to access patches in your mesh. That information is also available in the boundary file located typically in constant/polyMesh.

For topoSet itself, you need a topoSetDict which tells the code what to do. You can find a sample topoSetDict here: https://github.com/OpenFOAM/OpenFOAM...et/topoSetDict

The best way forward is to choose the best option for you from the above link and use that to create whatever you want to create.

Hope this helps.

Cheers,
Antimony

[priyankap]

Hi.


Thank you so much for your reply.


I tried using topoSet based on the requirement. My toposetDict is given below:

FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      topoSetDict;
}

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

actions
(
    // wall
    {
        name    hot;
        type    faceSet;
        action  new;
        source  patchToFace;
        sourceInfo
        {
            name "hotFace";
        }
    }
// Select based on faceSet
    {
        name    hotFaceCellSet;
        type      cellSet;
        action    new;
        source   faceToCell;
        sourceInfo
        {
            set hot;             // Name of faceSet

       //option neighbour; // cell with neighbour in faceSet
            //option owner;     //  ,,       owner
            option any;         // cell with any face in faceSet
            //option all;       // cell with all faces in faceSet
        }
    }
)

Now it is creating the faceSet and cellSet properly. The log file is given below:

Create time

Create polyMesh for time = 0

Reading topoSetDict

Time = 0
    mesh not changed.
Created faceSet hot
    Applying source patchToFace
    Adding all faces of patch hotFace ...
    Found matching patch hotFace with 1092 faces.
    faceSet hot now size 1092
Created cellSet hotFaceCellSet
    Applying source faceToCell
    Adding cells according to faceSet hot ...
    cellSet hotFaceCellSet now size 1092
End

But I am getting an error. My error is given below:

Creating finite volume options from "constant/fvOptions"

Selecting finite volume options model type scalarSemiImplicitSource
    Source: heatSource
    - selecting cells using cellSet hotFaceCellSet


--> FOAM FATAL ERROR: 
Illegal content 4105 of set:hotFaceCellSet of type cellSet
Value should be between 0 and 3956

    From function void Foam::topoSet::check(Foam::label)
    in file sets/topoSets/topoSet.C at line 189.

FOAM aborting

#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::error::abort() at ??:?
#2  Foam::topoSet::check(int) at ??:?
#3  Foam::cellSet::cellSet(Foam::polyMesh const&, Foam::word const&, Foam::IOobject::readOption, Foam::IOobject::writeOption) at ??:?
#4  Foam::fv::cellSetOption::setCellSet() at ??:?
#5  Foam::fv::cellSetOption::cellSetOption(Foam::word const&, Foam::word const&, Foam::dictionary const&, Foam::fvMesh const&) at ??:?
#6  Foam::fv::option::adddictionaryConstructorToTable<Foam::fv::SemiImplicitSource<double> >::New(Foam::word const&, Foam::word const&, Foam::dictionary const&, Foam::fvMesh const&) at ??:?
#7  Foam::fv::option::New(Foam::word const&, Foam::dictionary const&, Foam::fvMesh const&) at ??:?
#8  Foam::fv::optionList::reset(Foam::dictionary const&) at ??:?
#9  Foam::fv::optionList::optionList(Foam::fvMesh const&, Foam::dictionary const&) at ??:?
#10  Foam::fv::options::options(Foam::fvMesh const&) at ??:?
#11  ? at ??:?
#12  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#13  ? at ??:?
Aborted (core dumped)

Now, I can see that my faceSet and cellSet is created and fvOption is also reading it, But there is some problem with my faceSet (highlighted above).


I don't understand what I did wrong. Can you please guide me if possible?


Thank you

[Antimony]

Hi,

You could remove the files/sets that you created via topoSet and then try again with topoSet and running your case.

From the error message, it seems like you had an older version of your cellSet with more entries and hence that seems to have messed up with the latest version.

Hope this helps.

Cheers,
Antimony

[priyankap]

Thank you for your reply.



But I didn't get what do you exactly mean by older version of cellSet? where can I find that? because I don't have any cellSet before using topoSet. Once I run this topoSet command, then in the "sets" directory, I get two files (one is faceSet and one is cellSet).


Below is the log file of my ideasUnvToFoam.

Processing tag:2420
Skipping tag 2420 on line 9
Skipping section at line 9.

Processing tag:2411
Starting reading points at line 20.
Read 4174 points.

Processing tag:2412
Starting reading cells at line 8371.
First occurrence of element type 11 for cell 1 at line 8372
First occurrence of element type 41 for cell 280 at line 9209
First occurrence of element type 111 for cell 3749 at line 16147
Read 19434 cells and 3469 boundary faces.

Processing tag:2467
Starting reading patches at line 55017.
For group 1 named hotFace trying to read 253 patch face indices.
For group 2 named pipe trying to read 8741 patch face indices.
For group 3 named cold trying to read 4297 patch face indices.
For group 4 named hot trying to read 6396 patch face indices.

Of 3469 so-called boundary faces 261 belong to two cells and are therefore internal
Sorting boundary faces according to group (patch)
0: hotFace is patch
1: pipe is cellZone
2: cold is cellZone
3: hot is cellZone

Constructing mesh with non-default patches of size:
    hotFace    253

--> FOAM Warning : 
    From function Foam::polyMesh::polyMesh(const Foam::IOobject&, const Foam::Xfer<Foam::Field<Foam::Vector<double> > >&, const cellShapeList&, const faceListList&, const wordList&, const wordList&, const Foam::word&, const Foam::word&, const wordList&, bool)
    in file meshes/polyMesh/polyMeshFromShapeMesh.C at line 595
    Found 2955 undefined faces in mesh; adding to default patch.
Adding cell and face zones
 Cell Zone cold     4297
 Cell Zone hot     6396
 Cell Zone pipe     8741

End

Above you can see, tha my cellZone "hot" has 6396 patch face indices.

For group 4 named hot trying to read 6396 patch face indices.

Now, I am trying to make a cellSet from the patch "hotFace" which is a patch in the cellZone "hot". and for that I am using the topoSetDict file which is given below.

actions
(
    {
        name    hot1;
        type    faceSet;
        action  new;
        source  patchToFace;
        sourceInfo
        {
            name "hotFace";
        }
    }
     
// Select based on faceSet
    {
        name    hotcell;
        type    cellSet;
        action  new;
        source  faceToCell;
        sourceInfo
        {
            set hot1;             // Name of faceSet

            //option neighbour; // cell with neighbour in faceSet
            //option owner;     //  ,,       owner
            option any;         // cell with any face in faceSet
            //option all;       // cell with all faces in faceSet
        } 
    }
);

But I am getting this error:

--> FOAM FATAL ERROR: 
Illegal content 8200 of set:hotcell of type cellSet
Value should be between 0 and 6396

    From function void Foam::topoSet::check(Foam::label)
    in file sets/topoSets/topoSet.C at line 189.

FOAM aborting

#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::error::abort() at ??:?
#2  Foam::topoSet::check(int) at ??:?
#3  Foam::cellSet::cellSet(Foam::polyMesh const&, Foam::word const&, Foam::IOobject::readOption, Foam::IOobject::writeOption) at ??:?
#4  Foam::fv::cellSetOption::setCellSet() at ??:?
#5  Foam::fv::cellSetOption::cellSetOption(Foam::word const&, Foam::word const&, Foam::dictionary const&, Foam::fvMesh const&) at ??:?
#6  Foam::fv::option::adddictionaryConstructorToTable<Foam::fv::SemiImplicitSource<double> >::New(Foam::word const&, Foam::word const&, Foam::dictionary const&, Foam::fvMesh const&) at ??:?
#7  Foam::fv::option::New(Foam::word const&, Foam::dictionary const&, Foam::fvMesh const&) at ??:?
#8  Foam::fv::optionList::reset(Foam::dictionary const&) at ??:?
#9  Foam::fv::optionList::optionList(Foam::fvMesh const&, Foam::dictionary const&) at ??:?
#10  Foam::fv::options::options(Foam::fvMesh const&) at ??:?
#11  ? at ??:?
#12  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#13  ? at ??:?
Aborted (core dumped)

I don't understand why is it taking invalid values, while I don't have any other(or older cellSet) ?


Am I making any mistake in making the topoSetDict file?

Thank you

[Antimony]

Hi,

There doesn't seem to be anything wrong with your topoSetDict. There seems to be an issue with numbering by the looks of it, which in turn is causing issues for you.

I have never used ideasUnvToFoam, so am not sure if there is some flag or setting that you need to use so that other OF operations can be performed on the converted mesh.

Cheers,
Antimony