[Gmsh] gmshToFoam unhandled element

flowris · July 14, 2010, 10:48

Hello,

1. I am trying to convert a gmsh using gmshtoFoam. The .msh-file I use is good, because I see a nice mesh in the gmsh GUI. When I type
gmshToFoam blok01.msh

the console answers (only the lower lines)

Code:

...
Unhandled element 1 at line 430
Unhandled element 1 at line 431
Unhandled element 1 at line 432
Unhandled element 1 at line 433
Unhandled element 1 at line 434
Unhandled element 1 at line 435
Unhandled element 1 at line 436
Unhandled element 1 at line 437
Unhandled element 1 at line 438
Mapping region 0 to Foam patch 0
Cells:
    total:0
    hex  :0
    prism:0
    pyr  :0
    tet  :0



No cells read from file "blok01.msh"
Does your file specify any 3D elements (hex=5, prism=6, pyramid=7, tet=4)?
Perhaps you have not exported the 3D elements?

    From function readCells(..)
    in file gmshToFoam.C at line 662.

FOAM exiting

My blok.msh file is attached.

2. How do I define the patches? I assume I have to make physical surfaces in the .geo file, but this has not been succesfull so far.

KateEisenhower · June 25, 2015, 10:35

Quote:

Originally Posted by flowris

Hello,

1. I am trying to convert a gmsh using gmshtoFoam. The .msh-file I use is good, because I see a nice mesh in the gmsh GUI. When I type
gmshToFoam blok01.msh

the console answers (only the lower lines)

Code:

...
Unhandled element 1 at line 430
Unhandled element 1 at line 431
Unhandled element 1 at line 432
Unhandled element 1 at line 433
Unhandled element 1 at line 434
Unhandled element 1 at line 435
Unhandled element 1 at line 436
Unhandled element 1 at line 437
Unhandled element 1 at line 438
Mapping region 0 to Foam patch 0
Cells:
    total:0
    hex  :0
    prism:0
    pyr  :0
    tet  :0



No cells read from file "blok01.msh"
Does your file specify any 3D elements (hex=5, prism=6, pyramid=7, tet=4)?
Perhaps you have not exported the 3D elements?

    From function readCells(..)
    in file gmshToFoam.C at line 662.

FOAM exiting

My blok.msh file is attached.

2. How do I define the patches? I assume I have to make physical surfaces in the .geo file, but this has not been succesfull so far.

Hello,

how did you solve this problem?

Best regards,

Kate

jcharbonneau · August 6, 2018, 10:13

I fell upon this thread when looking up the error.

I got the same error because I had forgotten to define physical surfaces in the .geo file.

I did not look at your .geo file (can't find it/not attached anymore, new guy on the forum here), but I assume that all surfaces must have a physical name.

This is for someone in the future like me who might get the same error.

wa$$im · February 20, 2023, 18:31

It's not mandatory to assign a physical surface to each geometrical surface. Non assigned surfaces are converted into "defaultFaces" patch in OpenFoam.

Whereas, you should always take care of creating a physical volume.

Also, surfaces that belong to more than one physical surface ususally generate errors.

wa$$im · February 20, 2023, 18:50

The error about unhandled elements : 'Unhandled element 1 at line 430 ... ' comes out because gmshToFoam does not support geometrical entities (geometrical points, lines, surfaces, ...). So the error has nothing to do with the quality of the mesh that you see in the GUI, but with how you write the mesh in the .msh-file.

When writing your msh, do not just 'Save Mesh'. Instead, go to Export and pick .msh file format. Then in 'MSH Option' uncheck 'Save all Elements'. And finally Save the mesh.

Preferably, also select the 'Version 2 ASCII' file format.

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August 6, 2018, 10:13		#3
jcharbonneau New Member Jonathan Charbonneau Join Date: Jul 2018 Posts: 1 Rep Power: 0	I fell upon this thread when looking up the error. I got the same error because I had forgotten to define physical surfaces in the .geo file. I did not look at your .geo file (can't find it/not attached anymore, new guy on the forum here), but I assume that all surfaces must have a physical name. This is for someone in the future like me who might get the same error.

February 20, 2023, 18:31		#4
wa$$im New Member Wassim Abdel Nour Join Date: Feb 2021 Location: France Posts: 16 Blog Entries: 1 Rep Power: 5	It's not mandatory to assign a physical surface to each geometrical surface. Non assigned surfaces are converted into "defaultFaces" patch in OpenFoam. Whereas, you should always take care of creating a physical volume. Also, surfaces that belong to more than one physical surface ususally generate errors.

February 20, 2023, 18:50		#5
wa$$im New Member Wassim Abdel Nour Join Date: Feb 2021 Location: France Posts: 16 Blog Entries: 1 Rep Power: 5	The error about unhandled elements : 'Unhandled element 1 at line 430 ... ' comes out because gmshToFoam does not support geometrical entities (geometrical points, lines, surfaces, ...). So the error has nothing to do with the quality of the mesh that you see in the GUI, but with how you write the mesh in the .msh-file. When writing your msh, do not just 'Save Mesh'. Instead, go to Export and pick .msh file format. Then in 'MSH Option' *uncheck 'Save all Elements'. And finally Save* the mesh. Preferably, also select the 'Version 2 ASCII' file format.