[Gmsh] Import gmsh msh to Foam

mattijs · April 27, 2005, 05:34

Have a search on this site for gmshToFoam. This is a well known problem. Also there is a gmshToFoam.C (replacement source code for mesh/conversion/gmshToFoam/gmshToFoam.C) attached on this site somewhere which you might want to use instead.

aap · April 27, 2005, 08:42

Hallo Mattijs,
I have used the new version of the gmshToFoam.C file. I have run my mesh (a 3d one) and I get problems again. It seems that it is not possible to create cells.

-->
ead nVerts:665

Read nElems:1443

Mapping region 19 to Foam patch 0
Mapping region 20 to Foam patch 1
Mapping region 21 to Foam patch 2
Mapping region 22 to Foam patch 3
Mapping region 23 to Foam patch 4
Mapping region 24 to Foam patch 5
Cells:
total:0
hex :0
prism:0
pyr :0
tet :0

Patches:
Patch Size
0 156
1 144
2 271
3 238
4 269
5 248

--> FOAM FATAL ERROR : faces deallocated

Function: const faceList& polyMesh::allFaces() const
in file: meshes/polyMesh/polyMesh.C at line: 562.

FOAM aborting

Do you have any idea what I am doing wrong?
Thanks
Amalia

panara · April 27, 2005, 08:57

Are you sure that are you using 3D elements?
I got the same kind of error when I was trying to import 2D elements.

check in the mesh file if the elements are Tetrahedron (4 nodes) or Hexahedron (8 nodes).

In the list of the element the second number corresponds to the element type ( 4 for Tetrahedron and 5 for Hexahedron ).

the color of the grid in gmsh should be all orange ( with the default color settings )

I hope to help you,

Daniele

aap · April 27, 2005, 09:10

Hi Daniele!

you are right! I am using a 2D mesh. Do you know how can I obtain a 3D mesh?
Thanks a lot
Amalia

panara · April 27, 2005, 09:19

follow the steps that are in the gmsh manual...
there are different ways, for example you can use the transfinite algorithm...

In that case pay attention on the order of the faces..

good luck =)

Daniele

April 27, 2005, 05:34	Have a search on this site for	#21
mattijs Senior Member Mattijs Janssens Join Date: Mar 2009 Posts: 1,419 Rep Power: 26	Have a search on this site for gmshToFoam. This is a well known problem. Also there is a gmshToFoam.C (replacement source code for mesh/conversion/gmshToFoam/gmshToFoam.C) attached on this site somewhere which you might want to use instead.

April 27, 2005, 08:42	Hallo Mattijs, I have used t	#22
aap New Member Amalia Apalategui Join Date: Mar 2009 Posts: 13 Rep Power: 17	Hallo Mattijs, I have used the new version of the gmshToFoam.C file. I have run my mesh (a 3d one) and I get problems again. It seems that it is not possible to create cells. --> ead nVerts:665 Read nElems:1443 Mapping region 19 to Foam patch 0 Mapping region 20 to Foam patch 1 Mapping region 21 to Foam patch 2 Mapping region 22 to Foam patch 3 Mapping region 23 to Foam patch 4 Mapping region 24 to Foam patch 5 Cells: total:0 hex :0 prism:0 pyr :0 tet :0 Patches: Patch Size 0 156 1 144 2 271 3 238 4 269 5 248 --> FOAM FATAL ERROR : faces deallocated Function: const faceList& polyMesh::allFaces() const in file: meshes/polyMesh/polyMesh.C at line: 562. FOAM aborting Do you have any idea what I am doing wrong? Thanks Amalia

April 27, 2005, 08:57	Are you sure that are you usin	#23
panara Senior Member Daniele Panara Join Date: Mar 2009 Posts: 101 Rep Power: 17	Are you sure that are you using 3D elements? I got the same kind of error when I was trying to import 2D elements. check in the mesh file if the elements are Tetrahedron (4 nodes) or Hexahedron (8 nodes). In the list of the element the second number corresponds to the element type ( 4 for Tetrahedron and 5 for Hexahedron ). the color of the grid in gmsh should be all orange ( with the default color settings ) I hope to help you, Daniele

April 27, 2005, 09:10	Hi Daniele! you are right!	#24
aap New Member Amalia Apalategui Join Date: Mar 2009 Posts: 13 Rep Power: 17	Hi Daniele! you are right! I am using a 2D mesh. Do you know how can I obtain a 3D mesh? Thanks a lot Amalia

April 27, 2005, 09:19	follow the steps that are in t	#25
panara Senior Member Daniele Panara Join Date: Mar 2009 Posts: 101 Rep Power: 17	follow the steps that are in the gmsh manual... there are different ways, for example you can use the transfinite algorithm... In that case pay attention on the order of the faces.. good luck =) Daniele

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