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blockMesh to generate the mesh of a deep cavity

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Old   July 2, 2015, 10:13
Default blockMesh to generate the mesh of a deep cavity
  #1
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DongHo
Join Date: Jul 2013
Posts: 24
Rep Power: 5
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Dear. Foamers

Hi..

I am trying to generate a mesh for a deep cavity.
However, there were some of errors in generating it as follows(blockMeshDict, error message).
I will appreciate it if someone can check a blockMeshDict file and give a good advice for me.

Thank you.



/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1;

vertices
(
(0.0 0.0 -0.05)
(0.05 0.0 -0.05)
(0.05 -0.12 -0.05)
(0.1 -0.12 -0.05)
(0.1 0.0 -0.05)
(0.3 0.0 -0.05)
(0.0 0.1 -0.05)
(0.05 0.1 -0.05)
(0.1 0.1 -0.05)
(0.3 0.1 -0.05)
(0.0 0.0 0.05)
(0.05 0.0 0.05)
(0.05 -0.12 0.05)
(0.1 -0.12 0.05)
(0.1 0.0 0.05)
(0.3 0.0 0.05)
(0.0 0.1 0.05)
(0.05 0.1 0.05)
(0.1 0.1 0.05)
(0.3 0.1 0.05)


);

blocks
(
hex (0 1 7 6 10 11 17 16) (48 16 1) simpleGrading (1 1 1)
// hex (4 1 2 3 14 11 12 13) (96 32 1) simpleGrading (1 1 1)
hex (2 3 4 1 12 13 14 11) (48 16 1) simpleGrading (1 1 1)
hex (1 4 8 7 11 14 18 17) (48 16 1) simpleGrading (1 1 1)
hex (4 5 9 8 14 15 19 18) (48 16 1) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
inlet
{
type patch;
faces
(
(0 6 16 10)
);
}
outlet
{
type patch;
faces
(
(5 9 19 15)
);
}
/* cavity
{
type wall;
faces
(
(2 3 13 12) //(0 10 11 1)
);
}
*/
top
{
type symmetryPlane;
faces
(
(6 16 17 7)
(7 17 18 8)
(8 18 19 9)
);
}
bottom
{
type wall;
faces
(
(0 1 11 10)
(1 2 12 11)
(2 3 13 12)
(3 4 14 13)
(4 5 15 14)
);
}
);

mergePatchPairs
(
);

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



/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 2.3.0-f5222ca19ce6
Exec : blockMesh
Date : Jul 02 2015
Time : 23:06:37
Host : "user-All-Series"
PID : 2982
Case : /home/user/OpenFOAM/user-2.3.0/run/forwardStep
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Disallowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Creating block mesh from
"/home/user/OpenFOAM/user-2.3.0/run/forwardStep/constant/polyMesh/blockMeshDict"
Creating curved edges
Creating topology blocks
Creating topology patches

Creating block mesh topology
--> FOAM Warning :
From function polyMesh:olyMesh(... construct from shapes...)
in file meshes/polyMesh/polyMeshFromShapeMesh.C at line 903
Found 8 undefined faces in mesh; adding to default patch.

Check topology

Basic statistics
Number of internal faces : 3
Number of boundary faces : 18
Number of defined boundary faces : 18
Number of undefined boundary faces : 0
Checking patch -> block consistency

Creating block offsets
Creating merge list .

Creating polyMesh from blockMesh
Creating patches
Creating cells
Creating points with scale 1
Block 0 cell size :
i : 0.00104167 .. 0.00104167
j : 0.00625 .. 0.00625
k : 0.1 .. 0.1

Block 1 cell size :
i : 0.00104167 .. 0.00104167
j : 0.0075 .. 0.0075
k : 0.1 .. 0.1

Block 2 cell size :
i : 0.00104167 .. 0.00104167
j : 0.00625 .. 0.00625
k : 0.1 .. 0.1

Block 3 cell size :
i : 0.00416667 .. 0.00416667
j : 0.00625 .. 0.00625
k : 0.1 .. 0.1


Writing polyMesh
----------------
Mesh Information
----------------
boundingBox: (0 -0.12 -0.05) (0.3 0.1 0.05)
nPoints: 6498
nCells: 3072
nFaces: 12464
nInternalFaces: 5968
----------------
Patches
----------------
patch 0 (start: 5968 size: 16) name: inlet
patch 1 (start: 5984 size: 16) name: outlet
patch 2 (start: 6000 size: 144) name: top
patch 3 (start: 6144 size: 176) name: bottom
patch 4 (start: 6320 size: 6144) name: defaultFaces

End
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Old   July 3, 2015, 09:42
Default
  #2
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Alexander Bartel
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Hi Dong Ho,

could you draw a sketch of your geometry... that would help me to visualize your mesh.

regards
Alex
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Old   July 4, 2015, 22:02
Default
  #3
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DongHo
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Posts: 24
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Hi.. Alex

Thank you for your response.
I managed to generate a mesh for a supersonic cavity.
However, that is not good enough because I will need grid grading in multi-direction. I know that OpenFOAM versions before v2.40 do not provide the multi-grading of the grid. I guess I might be able to generate the mesh I will eventually need if I divide a domain into many blocks. But, dividing it more blocks will be quite tedious works. So, I'd like to know if there is a good way to generate the mesh like that. I have attached the mesh I generated. The left side is an inlet and the right side is outlet. The top and bottom sides are walls. As you know, the mesh will need to be expanded from both walls on the top and bottom, also from the sides of the cavity.
So, can OpenFOAM v 2.40 be installed into Ubuntu 12.04 LTS? It is said on the web that OpenFOAM v2.40 can be installed into Ubuntu 14.04 LTS though.. Is there any way to install OpenFOAM v2.40 into Ubuntu 12.04 LTS? since v2.40 can provide multi-grading mesh.

I will appreciate it if you can let me know these kinds of things.


/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 0.1;

vertices
(
(0 0 0)
(1 0 0)
(1 1 0)
(0 1 0)
(0 0 0.1)
(1 0 0.1)
(1 1 0.1)
(0 1 0.1)
);

blocks
(
hex (0 1 2 3 4 5 6 7) (20 20 1) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
movingWall
{
type wall;
faces
(
(3 7 6 2)
);
}
fixedWalls
{
type wall;
faces
(
(0 4 7 3)
(2 6 5 1)
(1 5 4 0)
);
}
frontAndBack
{
type empty;
faces
(
(0 3 2 1)
(4 5 6 7)
);
}
);

mergePatchPairs
(
);

// ************************************************** *********************** //
Attached Images
File Type: jpg cavity.jpg (85.6 KB, 9 views)
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Old   July 4, 2015, 22:06
Default blockMeshDict file
  #4
New Member
 
DongHo
Join Date: Jul 2013
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Sorry I have attached a wrong file.
This is my blockMeshDict file for a supersonic cavity.

Thanks

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1;

vertices
(
(0.0 0.0 -0.06)
(0.05 0.0 -0.06)
(-0.05 0.12 -0.06)
(0.0 0.12 -0.06)
(0.05 0.12 -0.06)
(0.25 0.12 -0.06)
(-0.05 0.22 -0.06)
(0.0 0.22 -0.06)
(0.05 0.22 -0.06)
(0.25 0.22 -0.06)
(0.0 0.0 0.06)
(0.05 0.0 0.06)
(-0.05 0.12 0.06)
(0.0 0.12 0.06)
(0.05 0.12 0.06)
(0.25 0.12 0.06)
(-0.05 0.22 0.06)
(0.0 0.22 0.06)
(0.05 0.22 0.06)
(0.25 0.22 0.06)


);

blocks
(
hex (0 1 4 3 10 11 14 13) (72 96 32) simpleGrading (4 0.25 1)
/* simpleGrading
(
(
(0.2 0.3 4)
(0.6 0.4 1)
(0.2 0.3 0.25)
)
(
(0.2 0.3 4)
(0.6 0.4 1)
(0.2 0.3 0.25)
)
1
) */
hex (2 3 7 6 12 13 17 16) (72 64 32) simpleGrading (0.25 4 1)
/* simpleGrading
(
(
(0.4 0.3 4)
(0.6 0.7 0.25)
)
(
(0.4 0.3 4)
(0.6 0.7 0.25)
)
1
) */
hex (3 4 8 7 13 14 18 17) (72 64 32) simpleGrading (4 4 1)
/* simpleGrading
(
(
(0.2 0.3 4)
(0.6 0.4 1)
(0.2 0.3 0.25)
)
(
(0.4 0.3 4)
(0.6 0.7 0.25)
)
1
) */
hex (4 5 9 8 14 15 19 18) (96 64 32) simpleGrading (8 4 1)
/* simpleGrading
(
(
(0.4 0.3 4)
(0.6 0.7 0.25)
)
(
(0.4 0.3 4)
(0.6 0.7 0.25)
)
1
) */
);

edges
(
);

boundary
(
inlet
{
type patch;
faces
(
(2 6 16 12)
);
}
outlet
{
type patch;
faces
(
(5 9 19 15)
);
}
/* cavity
{
type wall;
faces
(
(2 3 13 12) //(0 10 11 1)
);
}
*/
top
{
type wall; //symmetryPlane;
faces
(
(6 16 17 7)
(7 17 18 8)
(8 18 19 9)
);
}
bottom
{
type wall;
faces
(
(2 3 13 12)
(3 0 10 13)
(0 1 11 10)
(1 4 14 11)
(4 5 15 14)
);
}
back
{
type empty;
faces
(
(0 3 4 1)
(2 6 7 3)
(3 7 8 4)
(4 8 9 5)
);
}
front
{
type empty;
faces
(
(10 13 14 11)
(12 16 17 13)
(13 17 18 14)
(14 18 19 15)
);
}

);

mergePatchPairs
(
);

// ************************************************** *********************** //
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Old   July 5, 2015, 16:54
Default
  #5
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Alexander Bartel
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sorry, I didn't realized your new questions the post before...

I don't know much about multigrading and installation issues...

Perhaps you post your question about the installation of OF2.4 in another subforum.

regards
Alex
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Last edited by alexB; July 6, 2015 at 08:26.
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