dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, Jun 22, 2009 at 11:11:53AM -0500, Robert Kirby wrote:
> Is there a demo or other info anywhere on how to specify and impose internal
> boundaries?
> 
> I'm thinking of potential flow around an airfoil, where you have a branch cut
> trailing away from the
> tip and need to impose a boundary condition there to allow the solution to be
> two-sided.  This
> is set up in Carey & Oden Texas Finite Element Series VI on Fluid Mechanics.
> 
> Thanks,
> Rob Kirby

You need to mark the facets somehow (assign numbers) and then you can
associate a condition with each number. Here's a demo:

  demo/pde/bcs/python/demo.py

Is that what you have in mind?

Boundary indicators can be assigned using MeshBuilder:

  http://www.fenics.org/dev/meshbuilder

-- 
Anders

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