Direct modification of the matrix (in general) to apply such a constraint
will need consideration of the basis type and order, and how these map to
the dofs. I am not sure this will be that easy to do, but I might be wrong.
Vikram Garg
vikramvgarg.github.io/
On Sun, Jun 27, 2021 at 9:00 PM Rena
On 2021-06-28 00:18, Renato Poli wrote:
Hi, thanks for the answer:
@edgar: it is a FORCE (Neumann) while DISPLACEMENTS (primary variables)
must be tied together ... Please let me know if it is clear.
Totally. Thanks. I wish I could do more :) .
Thanks,
Renato
_
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 val
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 pena
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
Hi,
I'd like to add a force to a whole boundary. The constraint is that the
whole boundary must have the same displacement.
It seems desirable to add the force to an extra node, and then constraint
the whole boundary to this note through add_constrain_row.
Is that so? Do you see any better appro
