Hey everyone,
I am trying to apply boundary conditions on a Sparsematrix with two
Dof_handlers in a parallel::distributed::trinagulation setting for the
Step-35 tutorial.
( Same context as in this thread
https://groups.google.com/forum/#!topic/dealii/9ibgrQ0mFBs).
At initializing the gradient_operator, I have an object with two
Dof_Handlers, which I use for a sparsity pattern.
DoFTools::make_sparsity_pattern
(dof_handler_velocity,dof_handler_pressure,dsp);
But when I apply boundary values to a PETSCWrapper::SparseMatrix using this
sparsity pattern I get the following error
at the function MatrixTools::apply_boundary_values"
The violated condition was: !has_ghost_elements()
I tried another way to apply the boundary conditions with the use of a
COnstraintMatrix as in the Step-40 tutorial. But in that case the
make_sparsity_pattern function doesn't work, when I use the commandd:
DoFTools::make_sparsity_pattern
(dof_handler_velocity,dof_handler_pressure,dsp,constraints_velocity,false);
(There I get the error "candidate expects 3 arguments, 5 provided).
Does somebody have an idea how I can apply the boundary values efficiently
in that case?
Thanks a lot and best regards
Gabriel
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