[blockMesh] Internal Walls

balkrishna · October 21, 2010, 03:56

I wish to generate a mesh for the geometry below. It is an air lift reactor :

My blockMeshDict is as follows :

Code:

/*--------------------------------*- C++ -*----------------------------------* \
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  1.7.0                                 |
|   \\  /    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)
    (9.7 0 0)
    (9.7 12 0)
    (0 12 0)
    (10.3 0 0)
    (10.3 12 0)
    (21.7 0 0)
    (21.7 12 0)
    (22.3 0 0)
    (22.3 12 0)
    (32 0 0)
    (32 12 0)
    (0 0 14)
    (9.7 0 14)
    (9.7 12 14)
    (0 12 14)
    (10.3 0 14)
    (10.3 12 14)
    (21.7 0 14)
    (21.7 12 14)
    (22.3 0 14)
    (22.3 12 14)
    (32 0 14)
    (32 12 14)
    (0 0 130)
    (9.7 0 130)
    (9.7 12 130)
    (0 12 130)
    (10.3 0 130)
    (10.3 12 130)
    (21.7 0 130)
    (21.7 12 130)
    (22.3 0 130)
    (22.3 12 130)
    (32 0 130)
    (32 12 130)
    (0 0 140)
    (9.7 0 140)
    (9.7 12 140)
    (0 12 140)
    (10.3 0 140)
    (10.3 12 140)
    (21.7 0 140)
    (21.7 12 140)
    (22.3 0 140)
    (22.3 12 140)
    (32 0 140)
    (32 12 140)
);

blocks
(
 hex (0 1 2 3 12 13 14 15) (10 10 10) simpleGrading (1 1 1)
 hex (1 4 5 2 13 16 17 14) (4 10 10) simpleGrading (1 1 1)
 hex (4 6 7 5 16 18 19 17) (10 10 10) simpleGrading (1 1 1)
 hex (6 8 9 7 18 20 21 19) (4 10 10) simpleGrading (1 1 1)
 hex (8 10 11 9 20 22 23 21) (10 10 10) simpleGrading (1 1 1)
 hex (12 13 14 15 24 25 26 27) (10 10 100) simpleGrading (1 1 1)
 hex (13 16 17 14 25 28 29 26) (4 10 100) simpleGrading (1 1 1)
 hex (16 18 19 17 28 30 31 29) (10 10 100) simpleGrading (1 1 1)
 hex (18 20 21 19 30 32 33 31) (4 10 100) simpleGrading (1 1 1)
 hex (20 22 23 21 32 34 35 33) (10 10 100) simpleGrading (1 1 1)
 hex (24 25 26 27 36 37 38 39) (10 10 10) simpleGrading (1 1 1)
 hex (25 28 29 26 37 40 41 38) (4 10 10) simpleGrading (1 1 1)
 hex (28 30 31 29 40 42 43 41) (10 10 10) simpleGrading (1 1 1)
 hex (30 32 33 31 42 44 45 43) (4 10 10) simpleGrading (1 1 1)
 hex (32 34 35 33 44 46 47 45) (10 10 10) simpleGrading (1 1 1)
  );

edges
(
);

patches
(
 patch sparger (
	      (4 6 7 5)
	      ) 

 patch outlet (
     (36 37 38 39)
     (37 40 41 38 )
     (40 42 43 41)
     (42 44 45 43)
     (44 46 47 45)
       	       )


 wall walls
 (
     (0 1 2 3)
     (1 4 5 2)
     (6 8 9 7)
     (8 10 11 9)
     (0 3 15 12)
     (10 11 23 22 )
     (0 1 13 12)
     (3 2 14 15)
     (1 4 16 13)
     (2 5 17 14)
     (4 6 18 16)
     (5 7 19 17)
     (6 8 20 18)
     (7 9 21 19)
     (8 10 22 20)
     (9 11 23 21)
     (13 16 17 14)
     (18 20 21 19)
     (12 15 27 24)
     (13 14 26 25)
     (16 17 29 28)
     (18 19 31 30)
     (20 21 33 32)
     (22 23 35 34)
     (13 16 28 25)
     (12 13 25 24)
     (16 18 30 28)
     (15 14 26 27)
     (14 17 29 26)
     (17 19 31 29)
     (18 20 32 30)
     (19 21 33 31)
     (20 22 34 32)
     (21 23 35 33)
     (25 28 29 26)
     (30 32 33 31)
     (24 25 37 36)
     (24 27 39 36)
     (25 26 38 37)
     (25 28 40 37)
     (26 29 41 38)
     (28 30 42 40)
     (30 32 44 42)
     (31 33 45 43)
     (29 31 43 41)
     (33 35 47 45)
     (32 34 46 44)
     (34 35 47 46)
     )
);

mergePatchPairs 
(
);

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

This gives the following error on running blockMesh :

Code:

--> FOAM FATAL ERROR: 
Trying to specify a boundary face 4(13 16 17 14) on the face on cell 1 which is either an internal face or already belongs to some other patch.  This is face 16 of patch 2 named walls.

    From function polyMesh::polyMesh
(
    const IOobject&,
    const Xfer<pointField>&,
    const cellShapeList& cellsAsShapes,
    const faceListList& boundaryFaces,
    const wordList& boundaryPatchTypes,
    const wordList& boundaryPatchNames,
    const word& defaultBoundaryPatchType
)
    in file meshes/polyMesh/polyMeshFromShapeMesh.C at line 483.

FOAM aborting

#0  Foam::error::printStack(Foam::Ostream&) in "/home/ifmg/OpenFOAM/OpenFOAM-1.7.0/lib/linuxGccDPOpt/libOpenFOAM.so"
#1  Foam::error::abort() in "/home/ifmg/OpenFOAM/OpenFOAM-1.7.0/lib/linuxGccDPOpt/libOpenFOAM.so"
#2  Foam::polyMesh::polyMesh(Foam::IOobject const&, Foam::Xfer<Foam::Field<Foam::Vector<double> > > const&, Foam::List<Foam::cellShape> const&, Foam::List<Foam::List<Foam::face> > const&, Foam::List<Foam::word> const&, Foam::List<Foam::word> const&, Foam::word const&, Foam::word const&, Foam::List<Foam::word> const&, bool) in "/home/ifmg/OpenFOAM/OpenFOAM-1.7.0/lib/linuxGccDPOpt/libOpenFOAM.so"
#3  
 in "/home/ifmg/OpenFOAM/OpenFOAM-1.7.0/applications/bin/linuxGccDPOpt/blockMesh"
#4  
 in "/home/ifmg/OpenFOAM/OpenFOAM-1.7.0/applications/bin/linuxGccDPOpt/blockMesh"
#5  
 in "/home/ifmg/OpenFOAM/OpenFOAM-1.7.0/applications/bin/linuxGccDPOpt/blockMesh"
#6  __libc_start_main in "/lib/tls/i686/cmov/libc.so.6"
#7  
 in "/home/ifmg/OpenFOAM/OpenFOAM-1.7.0/applications/bin/linuxGccDPOpt/blockMesh"
Aborted

How do i specify wall boundary condition for the internal walls . I checked the forums for the same but no topic could help me out . Do suggest me on how to overcome this error .

kumar · July 21, 2011, 19:14

HI balakrishna,
Did you manage to mesh your internal boundaries. I have a similar problem with same error and want to use blockMesh to solve thisproblem.

Give me suggestions to solve this problem.

regards
K.SUresh kumar

wyldckat · July 21, 2011, 19:54

Greetings to both of you!

Check this tutorial: multiphase/interDyMFoam/ras/damBreakWithObstacle

See Allrun and createObstacle.setSet.

For more about setSet: http://openfoamwiki.net/index.php/SetSet

Best regards,
Bruno

balkrishna · July 22, 2011, 01:22

Yes ..... this was a long time ago .... i managed to do the meshing and run the case too .... The key was in not meshing the baffles .... i.e. i commented the lines in red ....

Code:

blocks
(
 hex (0 1 2 3 12 13 14 15) (10 10 10) simpleGrading (1 1 1)
 hex (1 4 5 2 13 16 17 14) (4 10 10) simpleGrading (1 1 1)
 hex (4 6 7 5 16 18 19 17) (10 10 10) simpleGrading (1 1 1)
 hex (6 8 9 7 18 20 21 19) (4 10 10) simpleGrading (1 1 1)
 hex (8 10 11 9 20 22 23 21) (10 10 10) simpleGrading (1 1 1)
 hex (12 13 14 15 24 25 26 27) (10 10 100) simpleGrading (1 1 1)
// hex (13 16 17 14 25 28 29 26) (4 10 100) simpleGrading (1 1 1)
 hex (16 18 19 17 28 30 31 29) (10 10 100) simpleGrading (1 1 1)
// hex (18 20 21 19 30 32 33 31) (4 10 100) simpleGrading (1 1 1)
 hex (20 22 23 21 32 34 35 33) (10 10 100) simpleGrading (1 1 1)
 hex (24 25 26 27 36 37 38 39) (10 10 10) simpleGrading (1 1 1)
 hex (25 28 29 26 37 40 41 38) (4 10 10) simpleGrading (1 1 1)
 hex (28 30 31 29 40 42 43 41) (10 10 10) simpleGrading (1 1 1)
 hex (30 32 33 31 42 44 45 43) (4 10 10) simpleGrading (1 1 1)
 hex (32 34 35 33 44 46 47 45) (10 10 10) simpleGrading (1 1 1)
  );

kumar · July 22, 2011, 02:54

HI Bruno,
Thanks for pointing the right direction. This is what I want. I already started looking in to the tutorial.

I think it will help me solve the problem.

regards
K.SUresh kumar

KaLium · April 21, 2017, 07:00

Why are you using blockMesh for a complex geometry?

I would recommend snappyHexMesh.

alexeym · April 21, 2017, 10:16

Hi all,

@CHiller

Your blocks were merged, you as blockMesh said, you are trying to create patch inside the mesh (and it worries blockMesh). You have several choices:

1. Use 4 additional points (though with identical coordinates) to avoid automatic block merging.
2. Use createBaffles utility to create "patch" inside a mesh.

@KaLium

Complex geometry?

haydii · September 11, 2019, 18:04

Quote:

Originally Posted by wyldckat

Greetings to both of you!

Check this tutorial: multiphase/interDyMFoam/ras/damBreakWithObstacle

See Allrun and createObstacle.setSet.

For more about setSet: http://openfoamwiki.net/index.php/SetSet

Best regards,
Bruno

Many thanks Dear Bruno for straight help, It definitely works !

Regards,
Haydi

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July 21, 2011, 19:14		#2
kumar Senior Member Suresh kumar Kannan Join Date: Mar 2009 Location: Luxembourg, Luxembourg, Luxembourg Posts: 129 Rep Power: 17	HI balakrishna, Did you manage to mesh your internal boundaries. I have a similar problem with same error and want to use blockMesh to solve thisproblem. Give me suggestions to solve this problem. regards K.SUresh kumar

July 21, 2011, 19:54		#3
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,981 Blog Entries: 45 Rep Power: 128	Greetings to both of you! Check this tutorial: multiphase/interDyMFoam/ras/damBreakWithObstacle See Allrun and createObstacle.setSet. For more about setSet: http://openfoamwiki.net/index.php/SetSet Best regards, Bruno mizzou and ehabibi.s like this. __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

July 22, 2011, 02:54		#5
kumar Senior Member Suresh kumar Kannan Join Date: Mar 2009 Location: Luxembourg, Luxembourg, Luxembourg Posts: 129 Rep Power: 17	HI Bruno, Thanks for pointing the right direction. This is what I want. I already started looking in to the tutorial. I think it will help me solve the problem. regards K.SUresh kumar

April 21, 2017, 07:00		#6
KaLium Senior Member Kal-El Join Date: Apr 2017 Location: Finland Posts: 150 Rep Power: 9	Why are you using blockMesh for a complex geometry? I would recommend snappyHexMesh.

April 21, 2017, 10:16		#7
alexeym Senior Member Alexey Matveichev Join Date: Aug 2011 Location: Nancy, France Posts: 1,938 Rep Power: 39	Hi all, @CHiller Your blocks were merged, you as blockMesh said, you are trying to create patch inside the mesh (and it worries blockMesh). You have several choices: 1. Use 4 additional points (though with identical coordinates) to avoid automatic block merging. 2. Use createBaffles utility to create "patch" inside a mesh. @KaLium Complex geometry?