Alright guys i was able to solve this. Thanks
BBah schrieb am Montag, 18. Juli 2022 um 11:00:56 UTC+2:
> 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.
>
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