DOLFIN

NS L-shape mesh missing

Asked by Achim Schroll

Hej,
when running the NS demo demo_navier-stokes.py I get the error:
File "lshape.xml.gz" does not exist or is not a regular file.

Apparently my installation is not complete or where else can I get the mesh from?

vh, Achim

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Johannes Ring
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Johannes Ring (johannr) said : 		#1

How did you install DOLFIN? If you are on Ubuntu and installed it from the packaging system, the lshape.xml.gz mesh can be found in several locations:

  /usr/share/dolfin/data/meshes/lshape.xml.gz
  /usr/share/dolfin/demo/pde/navier-stokes/cpp/lshape.xml.gz
  /usr/share/dolfin/demo/pde/navier-stokes/python/lshape.xml.gz

When installing DOLFIN from source, you should find lshape.xml.gz in these locations:

  <prefix>/share/dolfin/data/meshes/lshape.xml.gz
  <prefix>/share/dolfin/demo/pde/navier-stokes/cpp/lshape.xml.gz
  <prefix>/share/dolfin/demo/pde/navier-stokes/python/lshape.xml.gz

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Achim Schroll (achim-simula-deactivatedaccount) said : 		#2

the file is in all three locations /usr/share/dolfin/etc
I have read but no write access.
can that be the reason?
the file needs to be unzipped, I guess?

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Best Johannes Ring (johannr) said : 		#3

No, they don't need to be unzipped, but the demo_navier-stokes.py script assumes that the lshape.xml.gz mesh is located in the same folder as the script itself. You can just make a copy from one of the files in /usr/share/dolfin.

If you want to run the demos in /usr/share/dolfin, copy the entire folder to a location where you have write access, like for instance your home folder:

  cp -r /usr/share/dolfin $HOME/dolfin-doc

You can then run the demos from there. This is needed because /usr/share/dolfin is write protected for normal users.

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Achim Schroll (achim-simula-deactivatedaccount) said : 		#4

Thanks Johannes Ring, that solved my question.