Commits on Nov 9, 2022

1. Handle prescribed dofs in RHS of affine constraints …

   This patch fixes affine constraints with prescribed dofs in the RHS. In
   particular, we allow dofs that are prescribed by just an inhomogeneity
   (i.e. DBC) but disallow "nesting" affine constraints.
   
   Concretely, consider e.g. the following two constraints:
   
       u2 = f(t)
       u3 = u2 + b3
   
   Before this patch this was not handled correctly since the inhomogeneity
   for u3 was taken as b3, but it should really be b3 + f(t) by
   substituting u2 for f(t). Since we allow for time-dependent
   inhomogeneities this substitution can not be done in
   close!(::ConstraintHandler) and instead the effective inhomogeneity is
   computed in update!.
   
   Nested constraints, e.g.
   
       u2 = u3
       u3 = u5
   
   are still not allowed but in the future this can be resolved in
   close!(::ConstraintHandler) to
   
       u2 = u5
       u3 = u5
   
   However, this patch checks for such nesting and raises an error instead
   of resulting in incorrect answers as is the case before.
   
   Fixes #530.

   

   fredrikekre committed Nov 9, 2022
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