Re: [Libmesh-users] dirichlet boundary

[Manav B. <bha...@gm...>]

Thanks, David.

I will be able to do that. I also have a patch coming for some work on
sensitivity analysis.

I figured that the enforce_constraints_exactly method is what provides the
capability for other systems for application of Dirichlet bcs.  I should be
able to get the dof information from the related methods.

-Manav

On Wed, Nov 13, 2013 at 2:38 PM, David Knezevic
<dkn...@se...>wrote:

> Hi Manav,
>
> It would be great to update CondensedEigenSystem in the way you propose.
> I originally implemented that class since I needed it for some of the
> Reduced Basis code, and it pre-dates the DirichletBoundary stuff.
>
> Current the user has to initialize the list of Dirichlet dofs in
> CondensedEigenSystem. It would be great if the vector
> local_non_condensed_dofs_vector was instead initialized automatically
> based on the DirichletBoundary objects that are attached. It seems like
> that should be pretty easy. Are you interested in making a patch?
>
> David
>
>
>
> On 11/13/2013 02:01 PM, Manav Bhatia wrote:
> > Hi,
> >
> >      I am trying to understand the application of DirichletBoundary
> > constraints in the system solution.
> >
> >      For a system, say LinearImplicitSystem or NonlinearImplicitSystem,
> once
> > the user calls solve, at what stage (and which routine) in this function
> > call are the Dirichlet boundary conditions applied?
> >
> >      Also, is this also extended to the EigenTimeSystem?
> >
> >      I am currently using the CondensedEigenSystem with good success,
> but am
> > trying to figure out if the DirichletBoundary also applies to the other
> > implementation. It would perhaps be useful to add a helper function in
> > CondensedEigenSystem that uses the DirichletSystem to identify the dofs
> > that need to be condensed. Don't know how exactly that would be done
> > though...
> >
> > Thanks,
> > Manav
> >
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