Dear Alex,
you cannot set a SphericalManifold for the innermost part of a
hyper_ball because the transformation degenerates for radius=0. You need
to restrict the manifold to only the boundary or only the outer part of
the hyper_ball.
Best,
Martin
P.S. for future reference, if I have an issue formulated like this,
should I raise it on the deal.II repo or here in the mailing list?
The mailing list is the correct place for this kind of questions.
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