Re: [Libmesh-users] Rigid plates as BCs

[John P. <jwp...@gm...>]

On Wed, Feb 20, 2019 at 2:43 PM Renato Poli <re...@gm...> wrote:

> Hi all,
>
> Just refreshing this one, because I am sort of stuck in inserting a "rigid"
> BCs.
> It seems simple, but I cannot make it work.
>

Hi,

>From your error message, it sounds like you are introducing a coupling
(through the constraint) between two dofs which would otherwise not be
coupled, and this causes a new nonzero to be inserted into the system
matrix after preallocation. You may be able to work around this issue by
augmenting the sparsity pattern using a GhostingFunctor, similar to what is
done in miscellaneous/miscellaneous_ex9/augment_sparsity_on_interface.h.

--
John