Hi John, Should I consider "add_extra_ghost_elem"? Then I add "row_constraints" between the DOFs I need to tie together and this element. Does that make sense? If so, what element should I add? I just need a single DOF to tie many DOFs together.
thanks, Renato On Wed, Feb 20, 2019 at 6:07 PM Renato Poli <rebp...@gmail.com> wrote: > Adding the mailing list in distribution... > > On Wed, Feb 20, 2019 at 6:03 PM Renato Poli <rebp...@gmail.com> wrote: > >> Thanks. >> >> Do you see a better way to do? >> I can see that Abaqus uses an extra node to tie all dofs together. >> I need the DOFs to be identical. >> That means eliminating lines in the matrix so that the displacements are >> identical to each other. >> >> Renato >> >> On Wed, Feb 20, 2019 at 5:53 PM John Peterson <jwpeter...@gmail.com> >> wrote: >> >>> On Wed, Feb 20, 2019 at 2:43 PM Renato Poli <rebp...@gmail.com> 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 >>> >>> _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
