Error when saving the mesh with .msh format‏

Question

Hi,

I am studying the temperature distribution in isolated district heating pipes.

I have generated a mesh of the pipe in 2D with the program Gmsh and saved it as "DoublePipes2D.msh", and on my python code I have the following:

mesh = Mesh('DoublePipes2D.msh')
V = FunctionSpace(mesh, 'Lagrange', 1),

but when running the python code, I get an Error:

Error: Unable to open file.
Reason: Unknown file type (".msh") for file "DoublePipes2D.msh".
Where: This error was encountered inside File.cpp.

Which format should I use?

Thanks
Desirée

Answer 1

Take a look at the dolfin-convert utility (installed with FEniCS). That might do the trick to get it into xml.

Comments

That is, in shell run

$ dolfin-convert DoublePipes2D.msh DoublePipes2D.xml

and then load the mesh from converted file

mesh = Mesh('DoublePipes2D.xml')

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Thanks for your answers. I tried that but when writting

$ dolfin-convert DoublePipes2D.msh DoublePipes2D.xml

on the shell run, I get this message:

"dolfin-convert" is not recognized as an internal or external command, operable program or batch file.

Why is that happening?

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This post on Launchpad might be useful.

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Ok thank you. Now it allows me to generate the .XML but I have the same problem as Niklas. It gives an error message:
"dolfin-order is not recognized as an internal or external command..."

I tried to create a file dolfin-convert.bat, as Johannes Ring suggested, but when writting the following in the sell run:

python "%~dp0\dolfin-convert" %*

I got this error: python: can't open file '%~dp0\dolfin-convert%*': [Errno2] No such file or directory.

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I suggest you post your problem on the FeniCS support
http://fenicsproject.org/mailman/listinfo/fenics-support

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Ok! thank you for your help MiroK

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If your geometry isn't too complex, you might be able to do a workaround:

http://fenicsproject.org/documentation/dolfin/dev/python/demo/documented/mesh-generation/python/documentation.html