[lcj66]

Hi!

So I am attempting to make a mesh that is basically two rectangles, one on top of the other, with a membrane interface between. I have made the following blockMeshDict file:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.3.1                                |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
//***************************************//

convertToMeters 0.01;

vertices
(
    ( 0      0      0   ) // Number 0
    ( 14     0      0   ) // Number 1
    ( 14     0.3    0   ) // Number 2
    ( 0      0.3    0   ) // Number 3
    ( 0      0      0.1 ) // Number 4
    ( 14     0      0.1 ) // Number 5
    ( 14     0.3    0.1 ) // Number 6
    ( 0      0.3    0.1 ) // Number 7
    ( 0     -0.3    0   ) // Number 8
    ( 14    -0.3    0   ) // Number 9
    ( 14     0      0   ) // Number 10
    ( 0      0      0   ) // Number 11
    ( 0    -0.3    0.1  ) // Number 12
    ( 14   -0.3    0.1  ) // Number 13  
    ( 14     0    0.1   ) // Number 14
    ( 0      0    0.1   ) // Number 15 
);


blocks
(
   hex ( 0 1 2 3 4 5 6 7 ) (140 150 1) simpleGrading (1 10 1)
   hex ( 8   9   10 11 12 13 14 15 ) (140 150 1) simpleGrading (1 10 1)
);

edges
(
);

boundary
(
    inlet1
    {
         type patch;
         faces
         (
             (0 4 7 3)
         );
     }
     inlet2
     {
          type patch;
          faces
          (
              (9 10 14 13)
          );
      }
      outlet1
      {
           type patch;
           faces
           ( 
               (6 5 1 2)
           );
       }
       outlet2
       {
           type patch;
           faces
           ( 
               (11 8 12 15)
           );
       }
       fixedWalls
       {
            type wall;
            faces
            (
                (3 7 6 2)
                (8 9 13 12)
            );
        }     
);

mergePatchPairs
( 
);

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

and then I used the toposet utility and createbaffles utility to make a facezone out of the membrane and to make it into an internal boundary. Below are the toposetdict and createbafflesdict files:

/*--------------------------------*- 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       dictionary;
    object      topoSetDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
actions
(
    {
    name            f0;
    type            faceSet;
    action          new;
    source          boxToFace;
    sourceInfo
    {
        box         (0 0 0) (0.14 0 0.01);
    }
    }

);
//****************************************************************************//

/*--------------------------------*- 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       dictionary;
    object      createBafflesDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
internalFacesOnly false;
noFields          true;

baffles
{
    Membrane
    {
        type         faceZone;
        zoneName     f0;
        patchPairs
        {
           type      patch;
        }
     }
}
//***************************************************************************//

When this happens, the checkMesh says the mesh is ok, but it still has the message that:
" *Number of regions: 2
The mesh has multiple regions which are not connected by any face."

And I am almost certain this is why I am getting issues while attempting to use a custom built solver.

So, any ideas on how to connect the two regions? Im still new to openfoam so my knowledge about utilities is sparse and would like to get suggestions on where I should go.

Thanks!
Lori

[alexB]

Hi Lori,

it's an frequently made beginners error.
http://www.cfd-online.com/Forums/ope...ordinates.html

regards
Alex

[HJM]

Hi Lori,

Did you figure it out? Would you like to share your solution to this problem?

What I want to do is to make the top membrane surface as a patch. I use faceZoneSet in topoSet and createBaffles. But when I do checkMesh, I have the exact same problem about two regions. It seems cellzone is separated to two regions. I searched ton of threads for several days but didn't find a solution.

Would you please help me with that?

Thank you very much!