Stephen,
I looked at the source code and it looks to me like the documentation
is correct: component_map is just to remap components and can not be
used to do what you want. It is just passed to
create_boundary_mass_matrix().
On Wed, Feb 21, 2018 at 7:03 PM, Stephen Shannon
<stephenshannon1...@gmail.com> wrote:
> I am solving the 2D Stokes equations with Dirichlet BCs, so I have 3
> unknowns (u1, u2, p) with Dirichlet BCs on u1 and u2. Rather than
> interpolate, I'd like to project the Dirichlet boundary values.
>
> Looking at the documentation for VectorTools::project_boundary_values(), the
> description of the "std::vector< unsigned int > component_map" input
> describes exactly this scenario, seemingly indicating that using a
> component_map will allow me to project values to 2 of the 3 components of my
> finite element. However, reading the remainder of the description, and
> attempting to use the component_map, this seems to be not the case. What
> I'd need is a component_map of {0,1}....that is, the first boundary_function
> should apply to u1, and the second boundary_function should apply to u2.
> However, the map goes in the opposite direction....that is, it is required
> to have 3 components {0,1,?}: u1 gets the first boundary_function applied to
> it, u2 gets the second boundary_function applied to it, and p gets the ?
> boundary function applied to it.
>
> Is this part of the documentation incorrect when it mentions the Stokes
> problem as a use for the component_map? In any case, what is a recommended
> method to projecting the boundary values for the Stokes problem?
>
> Thanks,
> Stephen
>
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