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[Gmsh] 3D Mesh conversion from gmsh-2.5.0 to OpenFOAM

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Old   January 26, 2012, 11:18
Default 3D Mesh conversion from gmsh-2.5.0 to OpenFOAM
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Francesco Borgosano
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Dear all,

I'm trying to import on OpenFOAM a 3D Mesh I created using gmsh-2.5.0. I tried to figure out the right procedure reading several posts on this forum, and this is what I have done:

  1. Made *.geo file using gmsh.
  2. Define phyisical surfaces and volume.
  3. Made 3D mesh, obtaining *.msh file.
  4. Made new case folder in OpenFOAM copying an existing tutorials folder.
  5. Ran "gmshToFoam" command, obtaining in the folder constant/polyMesh the following files: sets (folder), boundary, cellZones, faces, faceZones, neighbour, owner, points, pointZones.
  6. Ran the "checkMesh" command, saving the result in a log file (I send you in attachment). I got the following error: "Failed 1 mesh checks", but reading the log file everything seems fine.
What could be the reason of the error?


When I try to run "paraFoam" it crashes!


Thanks in advance
Attached Files
File Type: gz PumpCell_II.geo.tar.gz (2.7 KB, 87 views)
File Type: txt log_check.txt (3.5 KB, 85 views)
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Old   January 27, 2012, 01:53
Default aspect ratio
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Zoltan Hernadi
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Hello Francesco,

I think the problem comes from "Max aspect ratio: 3062.79", so in some regions the size of the cells is 3000 times bigger in one direction than in another. Try meshing a simpler geometry first and keep max. aspect ratio below 10-100.

Zoltan
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Old   January 27, 2012, 05:07
Default Mesh visualization on ParaVieW
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Francesco Borgosano
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Hi Zoltan,

thanks for your reply!

You were right.... I tried with a simpler geometry and it worked, I got checkMesh ok! But when I try to visualize the 3D mesh on paraView it still crashes.

I also tried increasing "cl" in my .geo file to have a small number of cells. I got a 3D mesh with only 48 cells, but parView it still unable to open it.

What could be the reason? Do you think could be related to my hardware? Maybe my pc has not enough memory for graphical applications...

Francesco
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Old   January 29, 2012, 07:35
Default Mesh visualization on ParaVieW
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Francesco Borgosano
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Hi Zoltan,

using the function "Optimize(3D Netgen)" in gmsh-2.5.0, I was able to get the mesh I wish avoiding "High ratio aspect" error in checkMesh.

But I'm not yet able to visualize it on paraView. When I ran paraView, on the left column where is "Mesh parts" I have the physical surfaces I defined in my mesh using gmsh, when I select them and click apply nothing happens...

Better, my screen become grey and my pc seems to work, but the 3D Mesh doesn't appear on the screen.

Someone experienced problem to visualize 3D mesh in paraView?
Do you think could be an hardware related problem?

Francesco
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Old   January 30, 2012, 05:17
Default memory
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Zoltan Hernadi
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Dear Francesco,

Try a coarser mesh and check if you ran out of memory.

Zoltan
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Old   April 3, 2012, 04:58
Default
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Hi Francesco,

I know it is late and you may have already solved your problem. If you have not here could be the the solution

to view the mesh in paraview the patches which you selected in gmsh have to be defined first. You can still view the mesh by deselecting the volume fields in the properties pannel in paraview.

Hope this helps

Regards
Abhinay
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Old   March 8, 2013, 18:39
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try with Coarser mesh, it happens to me sometimes.
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Old   May 25, 2013, 06:26
Default problem
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Goth ydamil
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hello everybody
I have a problem in my program , I can't convert 3D GMSH to matlab
thank you very much
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Old   June 6, 2013, 17:09
Default gmsh problem
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Dinesh Balaji
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Hi everybody,

I am new to gmsh. When I tried to convert the mesh file to openfoam, am getting this error.


Skipping tag $ParametricNodes at line 93
Starting to read cells at line 835074
Cells to be read:793944



--> FOAM FATAL ERROR:
20 not found in table. Valid entries: 0()

From function HashTable<T, Key, Hash>:perator[](const Key&) const
in file /home/bluesim/OpenFOAM/OpenFOAM-1.6.x/src/OpenFOAM/lnInclude/HashTableI.H at line 128.

FOAM exiting



Can someone help on this?
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Old   July 12, 2013, 22:14
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Mohammad
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Hi Dinesh Balaji!
I also have the same problem!
Have you or anybody else solved it?
Thanks.
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Old   February 24, 2015, 09:10
Default
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I have this same problem while converting a gmsh mesh file to foam
Unhandled element 1 at line 146876
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Mapping region 0 to Foam patch 0
Cells:
total:0
hex :0
prism:0
pyr :0
tet :0



--> FOAM FATAL IO ERROR:
No cells read from file "cylinderc.msh"
Does your file specify any 3D elements (hex=5, prism=6, pyramid=7, tet=4)?
Perhaps you have not exported the 3D elements?

file: cylinderc.msh at line 151770.

From function readCells(..)
in file gmshToFoam.C at line 726.

FOAM exiting
Can someone please help me out
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Old   February 24, 2015, 09:18
Default
  #12
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Alexey Matveichev
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Hi,

According to Gmsh documentation, element ID 1 has 2-node line elements (http://www.geuz.org/gmsh/doc/texinfo...II-file-format). Are you sure your mesh is 3D?
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Old   February 24, 2015, 12:40
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  #13
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Yes.....at least it seems 3d in the gmesh
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Old   March 29, 2017, 09:53
Default unable to convert 3D mesh from gmsh to openfoam
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Bharadwaj Bhushan
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hello guys,

I am not able to convert 3D mesh file from gmsh to openfoam. If I do that, it says may be your mesh has 3D elements and may be you have not exported the 3D elements.

please I need help



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Old   March 29, 2017, 10:51
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Can you put a picture on what are you trying to mesh in 3D gmsh?

Best,
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Old   March 29, 2017, 11:02
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Quote:
Originally Posted by tareqkh View Post
Can you put a picture on what are you trying to mesh in 3D gmsh?

Best,

its just a pipe flow simple one

Point(1) = {0, 0, 0, 1.0};
//+
Point(2) = {0.1, 0, 0, 1.0};
//+
Point(3) = {-0.1, 0, 0, 1.0};
//+
Point(4) = {0, 0.1, 0, 1.0};
//+
Point(5) = {0, -0.1, 0, 1.0};
//+
Circle(1) = {3, 1, 5};
//+
Circle(2) = {5, 1, 2};
//+
Circle(3) = {2, 1, 4};
//+
Circle(4) = {4, 1, 3};
//+
Line Loop(5) = {4, 1, 2, 3};
//+
Plane Surface(6) = {5};
//+
Transfinite Line {4, 1, 2, 3} = 30 Using Progression 1;
//+
Transfinite Surface {6};
//+
Recombine Surface {6};
//+

//+
Extrude {0, 0, 1} {
Surface{6};
Layers{40};
Recombine;
}
//+
Physical Surface("inlet") = {28};
//+
Physical Surface("wall") = {27, 15, 19, 23};
//+
Physical Surface("outlet") = {28};
//+
Surface Loop(29) = {28, 15, 6, 19, 23, 27};



when I save it as save mesh in .msh file, later when I use gmshToFoam it says probably you haven't save 3D mesh
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Old   March 29, 2017, 11:33
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Try this;

Code:
l = 6;
r = 2;
Point(1) = {0, 0, 0, 0.0};
Point(2) = {l, 0.0, 0, 0.0};
Point(3) = {0, r, 0, 0.0};
Point(4) = {l, r, 0, 0.0};
Line(1) = {3, 1};
Line(2) = {1, 2};
Line(3) = {2, 4};
Line(4) = {4, 3};
Line Loop(5) = {4, 1, 2, 3};
Plane Surface(6) = {5};

Extrude {{1, 0, 0}, {0, 0, 0}, Pi/2} {
  Surface{6};
}
Extrude {{1, 0, 0}, {0, 0, 0}, Pi/2} {
  Surface{23};
}
Extrude {{1, 0, 0}, {0, 0, 0}, Pi/2} {
  Surface{40};
}
Extrude {{1, 0, 0}, {0, 0, 0}, Pi/2} {
  Surface{57};
}
Surface Loop(74) = {6, 23, 15, 18, 22};
Volume(75) = {74};
Surface Loop(76) = {23, 40, 32, 35, 39};
Volume(77) = {76};
Surface Loop(78) = {6, 66, 69, 73, 57};
Volume(79) = {78};
Surface Loop(80) = {40, 57, 49, 52, 56};
Volume(81) = {80};
d1 = 1;
d2 = 1;
d3 = 1;
N1 = 30;
N2 = 30;
N3 = 18;
Transfinite Line {2, 4, 42, 25, 8} = N1 Using Progression d1;
Transfinite Line {1, 43, 26, 9, 3, 45, 28, 11} = N2 Using Progression d2;
Transfinite Line {65, 14, 31, 48, 13, 64, 47, 30} = N3 Using Progression d3;
Transfinite Surface "*";
Transfinite Volume "*";
Recombine Surface "*";
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Old   January 8, 2019, 23:50
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i have same problem. my gmsh script.
//+
Point(1) = {-0, -0, 0, 1.0};
//+
Point(2) = {0.2, -0, 0, 1.0};
//+
Point(3) = {0.2, -0.4, 0, 1.0};
//+
Point(4) = {0, -0.4, 0, 1.0};
//+
//+
Line(1) = {1, 2};
//+
Line(2) = {2, 3};
//+
Line(3) = {3, 4};
//+
Line(4) = {4, 1};
//+
Line Loop(1) = {4, 1, 2, 3};
//+

//+
Plane Surface(1) = {1};
//+
Physical Line("inlet") = {1};
//+
Physical Line("outlet") = {3};
//+
Physical Line("chill boundary") = {2};
//+
Physical Line("symmetryPlane") = {4};
//+
Extrude {0, 0, -0.02} {
Surface{1}; Layers{1}; Recombine;
}

//+
Transfinite Surface {1};
//+
Transfinite Surface {26};
//+
Transfinite Surface {21};
//+
Transfinite Surface {25};
//+
Transfinite Surface {13};
//+
Transfinite Surface {26};
//+
Transfinite Surface {17};
//+
Transfinite Line {4, 2, 6} = 136 Using Progression 1;
//+
Transfinite Line {6, 8} = 136 Using Progression 1;
//+
Transfinite Line {1, 3} = 252 Using Progression 1;
//+
Transfinite Line {7, 9} = 252 Using Progression 1;
//+
Recombine Surface {1, 13, 26, 17, 21, 25};






please anybody tell me..what we do for this
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