timestepper.cpp
38a97fbd2242database

timestepper.cpp
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			#include "timestepper.hpp"

			#include "reactive_transport_solver_structs.hpp"

			namespace specmicp {
			namespace reactmicp {
			namespace solver {

			scalar_t Timestepper::next_timestep(
			scalar_t dt_done,
			ReactiveTransportReturnCode return_code,
			index_t nb_iterations
			)
			{
			if (return_code <= ReactiveTransportReturnCode::NotConvergedYet)
			{
			return get_options().decrease_failure*dt_done;
			}

			// previous timestep is correct
			m_total += dt_done;
			m_average.add_point(nb_iterations);

			scalar_t proposed_dt = dt_done;
			// If the error is minimized we increase the timestep
			if (return_code == ReactiveTransportReturnCode::ErrorMinimized)
			{
			proposed_dt *= get_options().increase_error_minimization;
			}
			else
			// Increase or decrease the timestep to reach the number of iteration target range
			{
			if (m_average.current_value() <= get_options().iteration_lower_target)
			{
			proposed_dt *= get_options().increase_factor;
			}
			else if (m_average.current_value() > get_options().iteration_upper_target)
			{
			proposed_dt *= get_options().decrease_factor;
			}
			}
			// Check that the total target is not exceeded
			if (m_total + proposed_dt > m_total_target)
			{
			proposed_dt = m_total_target - m_total;
			}

			// Check that the timestep is inside the bounds
			if (proposed_dt < get_options().lower_bound)
			{
			proposed_dt = get_options().lower_bound;
			}
			else if (proposed_dt > get_options().upper_bound)
			{
			proposed_dt = get_options().upper_bound;
			}

			return proposed_dt;

			}

			} // end namespace solver
			} // end namespace reactmicp
			} // end namespace specmicp