Data part, boundary conditions

bounda_dof 0 -bottom_edge -disx -disy
bounda_dof 1 -left_edge -disx
bounda_dof 2 -right_edge -disx

The bounda_dof records are used to prescribe unknowns (dof's). On the bottom edge the displacement in x-direction -disx and the displacement in y-direction -disy are suppressed, and on the left edge and right edge the displacement in x-direction -disx is suppressed. The nice thing about using geometries for boundary conditions is that these remain valid, even if you change the mesh (amount of elements, nodes).

First side remark: if we want to apply a non-zero displacement then also the bounda_time records should be specified; here however displacements on the edges are zero, and then the bounda_time records are not needed.

Second side remark: if displacements are prescribed, velocities automatically are calculated by Tochnog from the time derivative of the displacements. If you would prescribe velocities with -velx and -vely then displacements automatically follow from time integration of the velocities.

Third side remark: a list of all unknown names like -disx etc. can be found at dof_label in the users manual. The dof_label is available in the database file after the calculation.