Dear Elena,
I want to do something like below code, but I don't know how to write it
> correctly:
>
> template <int dim>
> void
> Solver<dim>::*assemble_linear_system *(LinearSystem &linear_system)
> {
> ....
> VectorTools::interpolate_boundary_values (dof_handler,
> 0,
>
> **boundary_values(0),*
>
> boundary_value_map);
>
> VectorTools::interpolate_boundary_values (dof_handler,
> 1,
>
> **boundary_values(1),*
>
> boundary_value_map);
> ...
> }
>
>
> template<int dim>
> void* My_Case_2*<dim>::*BoundaryValues::vector_value*(const
> Point<dim> &p,
>
>
> Vector<double> &values) const
> {
> ...
> if (boundary_indicator == 0) {
> BC = p(0) + p(1);
> } else if (boundary_indicator == 1) {
> BC = p(0)*p(0) + p(1);
> }
> ...
> }
>
You can do something like this if you define a member variable
current_boundary_indicator and set it correctly before calling
interpolate_boundary_values(), i.e. you would do
> boundary_values.current_boundary_indicator=0;
VectorTools::interpolate_boundary_values (dof_handler,0,boundary_values,
> boundary_value_map);
>
boundary_values.current_boundary_indicator=1;
VectorTools::interpolate_boundary_values (dof_handler,1,boundary_values,
> boundary_value_map);
>
If you have a look at the documentation of
VectorTools::interpolate_boundary_value [1], you see that there are
multiple functions with this name.
In particular, the one with the signature
> void VectorTools::interpolate_boundary_values
(const DoFHandlerType< dim, spacedim > &
> dof,
const std::map< types::boundary_id, const Function< spacedim, number > *
> > & function_map,
std::map< types::global_dof_index, number > &
> boundary_values,
const ComponentMask &
> component_mask = ComponentMask() )
might be a good alternative for you as also Bruno (with a ConstraintMatrix
instead of std::map< types::global_dof_index, number > &) already pointed
out.
Then, you would define one Function for each boundary_indicator and call
VectorTools::interpolate_boundary_values only once.
Best,
Daniel
[1]
https://www.dealii.org/8.5.0/doxygen/deal.II/namespaceVectorTools.html#a9f3e3ae1396811f998cc35f94cbaa926
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