Hi, thanks for the answer: @edgar: it is a FORCE (Neumann) while DISPLACEMENTS (primary variables) must be tied together. (I am trying to solve Mandel's problem in poroelasticity). Please let me know if it is clear.
@Vikram: I did not get exactly the use of the SCALAR variable. It is a single value in the whole domain, is that correct? Should I add this variable _only_ in the boundary domain? I am digging into the systems_of_equations_ex3, let's see if it gets clearer in the next few days. Thanks, Renato On Sun, Jun 27, 2021 at 8:38 PM Vikram Garg <vikram.v.g...@gmail.com> wrote: > You might need a Lagrange multiplier formulation that sets a state variable > in an entire subdomain or boundary to a single unknown scalar. Example 3 in > systems of equations might help, it shows how SCALAR variables can be used. > You could incorporate the scalar variable into the weak form via a penalty > method. > > Vikram Garg > > vikramvgarg.github.io/ > > > On Sun, Jun 27, 2021 at 6:10 PM edgar <edgar...@cryptolab.net> wrote: > > > On 2021-06-27 23:01, Renato Poli wrote: > > > I'd like to add a force to a whole boundary. The constraint is that the > > > whole boundary must have the same displacement. > > > ---8<--- snip > > > > For the sake of disambiguation: do you want to impose displacement or > > force? The displacement of a boundary is not only dependent on the force > > it receives. > > > > I am guessing that the developers (regular user here! hi!) would like to > > know. > > > > > > _______________________________________________ > > Libmesh-users mailing list > > Libmesh-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/libmesh-users > > > > _______________________________________________ > Libmesh-users mailing list > Libmesh-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/libmesh-users > _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
