Paras,
I don't think there is a way that's already implemented, but if you look at
the function that implements the periodic boundary conditions, you should be
able to clone it in your project and add the negative sign where necessary.
Alternatively, you can let the existing function create an AffineMatrix
object, and then iterate over it to create a second such object that has the
opposite sign.
Best
W.
On 4/14/22 11:28, Paras Kumar wrote:
*** Caution: EXTERNAL Sender ***
Dear dealii Community,
I am working on a solid mechanics related problem involving anti-periodic
constraints, i.e.
u_leftFace = - u_RightFace,
where u is the unknown field (a component of the dim-dimensional displacement
field).
One possible solution, I am aware of, involves marking the periodic faces by
means of boundary-ids, traversing through the dofs for each periodic face-pair
in order to determine the periodic dof pair and then manually add the entry in
the constraint matrix. This approach also worked for cases involving periodic
constraints with offsets.
I would like to know if there exists a simpler way of achieving the
aforementioned goal by a simpler approach, probably by passing some
appropriate parameters to the make_periodicity_constraints() function, since
we just have a sign change here.
Thanks and best regards,
Paras
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