Changing time step

[BBah]

Hello everybody,

i am trying to change my timestep after few simulations steps but i am getting a kink into my solution once i reduce my timestep.

I did this actually simple by adjusting my timestep once a certain time is reached when i apply the dirichlet boundary conditions:

          if(time.current() > trans*first_loading)

          {

          time.adjust_timestep_size(0);

          const double delta_length = parameters.stretch1;

          const unsigned int n_stretch_steps = static_cast<unsigned int>(parameters.load_time_first/time.get_delta_t());

          const double delta_u_x = delta_length/n_stretch_steps;      

          VectorTools::interpolate_boundary_values(dof_handler_ref,

                                                  boundary_id,

                                                  ConstantFunction<dim>(-delta_u_x,n_components),

                                                  constraints,

                                                  fe.component_mask(x_displacement));    

          // Fix z displacement to avoid rotation

          VectorTools::interpolate_boundary_values(dof_handler_ref,

                                                  boundary_id,

                                                  ZeroFunction<dim>(n_components),

                                                  constraints,

                                                  fe.component_mask(z_displacement));                                                              

          }

The adjust_timestep_size() void just does change delta_t to a new delta_t but i cannot find my error.

[BBah]

Alright guys i was able to solve this. Thanks