Hamed, [...] > I am going to do the same as Bastian, namely periodic boundary condition > for displacement such that u( 0, y ) = u( 1, y ) + *lambda ,* > * so I used the recommended above code by Bastian for applying > inhomogenity to predefined periodicity, in order to have reletive > dispacement between right and left faces,* > *but my results shows that both left and right faces are moving equally to > the same direction, not relative to each other.* > What you are doing is dof_left = dof_right dof_right = c resulting in dof_left = dof_right = c. The solution is to set inhomogeneities for the dofs on the left boundary instead of the right boundary and thus dof_left = dof_right +c. In particular, you don't want to constraint dofs that are not already in the ConstraintMatrix after you called make_periodicity_constraints. Hence, the code should then work without calling constraints.add_line().
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