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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