TimeLoop.h

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#pragma once
 
#include <functional>
#include <memory>
 
#include "NumLib/ODESolver/NonlinearSolver.h"
#include "NumLib/TimeStepping/Algorithms/TimeStepAlgorithm.h"
#include "Process.h"
#include "ProcessLib/Output/Output.h"
 
namespace NumLib
{
class ConvergenceCriterion;
}
 
namespace ChemistryLib
{
class ChemicalSolverInterface;
}
 
namespace ProcessLib
{
struct ProcessData;
 
class TimeLoop
{
public:
    TimeLoop(std::unique_ptr<Output>&& output,
             std::vector<std::unique_ptr<ProcessData>>&& per_process_data,
             const int global_coupling_max_iterations,
             std::vector<std::unique_ptr<NumLib::ConvergenceCriterion>>&&
                 global_coupling_conv_crit,
             const double start_time, const double end_time);
 
    void initialize();
    void outputLastTimeStep() const;
 
    ~TimeLoop();
 
    bool executeTimeStep();
    bool calculateNextTimeStep();
    double endTime() const { return _end_time; }
    double currentTime() const { return _current_time; }
    bool successful_time_step = false;
 
private:
    bool doNonlinearIteration(double const t, double const dt,
                              std::size_t const timesteps);
    void setCoupledSolutions();
 
    NumLib::NonlinearSolverStatus solveUncoupledEquationSystems(
        const double t, const double dt, const std::size_t timestep_id);
 
    NumLib::NonlinearSolverStatus solveCoupledEquationSystemsByStaggeredScheme(
        const double t, const double dt, const std::size_t timestep_id);
 
    std::pair<double, bool> computeTimeStepping(
        const double prev_dt, double& t, std::size_t& accepted_steps,
        std::size_t& rejected_steps,
        std::vector<std::function<double(double, double)>> const&
            time_step_constraints);
 
    template <typename OutputClass, typename OutputClassMember>
    void outputSolutions(bool const output_initial_condition, unsigned timestep,
                         const double t, OutputClass& output_object,
                         OutputClassMember output_class_member) const;
 
private:
    std::vector<GlobalVector*> _process_solutions;
    std::vector<GlobalVector*> _process_solutions_prev;
    std::unique_ptr<Output> _output;
    std::vector<std::unique_ptr<ProcessData>> _per_process_data;
 
    const double _start_time;
    const double _end_time;
    double _current_time = _start_time;
    std::size_t _accepted_steps = 0;
    std::size_t _rejected_steps = 0;
    double _dt = 0;
    int _repeating_times_of_rejected_step = 0;
    bool _last_step_rejected = false;
 
    const int _global_coupling_max_iterations;
    std::vector<std::unique_ptr<NumLib::ConvergenceCriterion>>
        _global_coupling_conv_crit;
 
    std::vector<GlobalVector*> _solutions_of_last_cpl_iteration;
 
    std::vector<std::size_t> _xdot_vector_ids;
};
}  // namespace ProcessLib