ExcMessage("Found a set of normal vectors that are nearly collinear.")

The error does not occur when a boundary condition of u=0 is used on the
two flat boundaries, nor when I use my no_normal_flux boundary
conditions on a hyper_cube. The error can be replicated by changing the
domain and boundary conditions accordingly to the Step 32 (developer
version). Any help in this matter would be greatly appreciated!

Can you come up with a small program that triggers this error? Take a look at the existing test cases for this function in
  http://dealii.org/svn/dealii/trunk/tests/deal.II/no_flux_01.cc
through
  http://dealii.org/svn/dealii/trunk/tests/deal.II/no_flux_09.cc
to see how such a test should ideally look like.

Cheers
 W.

------------------------------------------------------------------------
Wolfgang Bangerth               email:            [email protected]
                                www: http://www.math.tamu.edu/~bangerth/

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