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timestepper.hpp
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Mon, Aug 5, 19:28

timestepper.hpp
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#ifndef SPECMICP_REACTMICP_SOLVER_TIMESTEPPER_HPP
#define SPECMICP_REACTMICP_SOLVER_TIMESTEPPER_HPP
#include "utils/moving_average.hpp"
#include "utils/options_handler.hpp"
namespace specmicp {
namespace reactmicp {
namespace solver {
// forward declaration
enum class ReactiveTransportReturnCode;
//! \brief Options for the timestepper
struct TimestepperOptions
{
scalar_t lower_bound; //!< Lower bound for the timestep
scalar_t upper_bound; //!< Upper bound for the timestep
scalar_t restart_timestep; //!< Value used when restarting the problem
scalar_t iteration_lower_target{1.01}; //!< Lower target for the number of iterations
scalar_t iteration_upper_target{15.0}; //!< Upper target for the number of iterations
scalar_t alpha_average{0.5}; //!< Parameter for the exponential moving average
scalar_t decrease_failure{0.5}; //!< Reduction factor in case of failure
scalar_t increase_error_minimization{1.3}; //!< Increase factor in case of error minimization
scalar_t decrease_factor{0.75}; //!< Reduction factor to get the number of iterations inside the target
scalar_t increase_factor{1.25}; //!< Increase factor to get the number of iterations inside the target
TimestepperOptions(scalar_t dt_lower_bound, scalar_t dt_upper_bound):
lower_bound(dt_lower_bound),
upper_bound(dt_upper_bound),
restart_timestep(dt_lower_bound)
{}
};
//! \brief Adaptative timestepper for the reactive transport solver
class Timestepper: public OptionsHandler<TimestepperOptions>
{
public:
//! \brief Constructor
//!
//! \param dt_lower_bound lower_bound for the timestep
//! \param dt_upper_bound upper_bound for the timestep
//! \param total_target total target time
//! \param init_iterations initial iterations
Timestepper(scalar_t dt_lower_bound,
scalar_t dt_upper_bound,
scalar_t total_target,
scalar_t init_iterations
):
OptionsHandler(dt_lower_bound, dt_upper_bound),
m_total(0),
m_total_target(total_target),
m_average(0.5, init_iterations)
{
m_average.set_alpha(get_options().alpha_average);
}
//! \brief Return the total time
scalar_t get_total() const {return m_total;}
//! \brief Return the total target time
scalar_t get_total_target() const {return m_total_target;}
//! \brief Set the total target time
void set_total_target(scalar_t total_target) {m_total_target = total_target;}
void set_average_parameter(scalar_t alpha) {
get_options().alpha_average = alpha;
m_average.set_alpha(alpha);
}
//! obtain the next timestep
scalar_t next_timestep(scalar_t dt_done, ReactiveTransportReturnCode return_code, index_t nb_iterations);
private:
scalar_t m_total;
scalar_t m_total_target;
utils::ExponentialMovingAverage m_average;
};
} // end namespace solver
} // end namespace reactmicp
} // end namespace specmicp
#endif // SPECMICP_REACTMICP_SOLVER_TIMESTEPPER_HPP

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