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[Question #122849]: How to make a hole in a uniform mesh

To: dolfin@xxxxxxxxxxxxxxxxxxx
From: Øystein Sørensen <question122849@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 26 Aug 2010 15:05:00 -0000
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New question #122849 on DOLFIN:
https://answers.launchpad.net/dolfin/+question/122849

I am trying to make a uniform mesh, something like
mesh = Rectangle(0,0,4,1,nx,ny)
and then make two holes inside the mesh. The holes are supposed to represent a source and a sink, with inner boundary condition du/dn=f on the boundary of the holes.
I am aware that this is pretty straightforward to do in some external preprocessor, but I wonder if it is possible to implement this straight into Dolfin.
Ideally, the holes should be small (e.g. [0.01,0.01] squares).
Any idea?
Or may I alternatively define some inner boundary and implement the boundary condition on this?

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