diffusion_creep.h

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/*
  Copyright (C) 2019 - 2024 by the authors of the ASPECT code.
 
  This file is part of ASPECT.
 
  ASPECT is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2, or (at your option)
  any later version.
 
  ASPECT is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
  along with ASPECT; see the file LICENSE.  If not see
  <http://www.gnu.org/licenses/>.
*/
 
#ifndef _aspect_material_model_rheology_diffusion_creep_h
#define _aspect_material_model_rheology_diffusion_creep_h
 
#include <aspect/global.h>
#include <aspect/material_model/interface.h>
#include <aspect/material_model/utilities.h>
#include <aspect/simulator_access.h>
 
namespace aspect
{
  namespace MaterialModel
  {
    namespace Rheology
    {
      struct DiffusionCreepParameters
      {
        double prefactor;
        double activation_energy;
        double activation_volume;
        double stress_exponent;
        double grain_size_exponent;
 
        DiffusionCreepParameters();
      };
 
      template <int dim>
      class DiffusionCreep : public ::aspect::SimulatorAccess<dim>
      {
        public:
          DiffusionCreep();
 
          static
          void
          declare_parameters (ParameterHandler &prm);
 
          void
          parse_parameters (ParameterHandler &prm,
                            const std::unique_ptr<std::vector<unsigned int>> &expected_n_phases_per_composition = nullptr);
 
 
          const DiffusionCreepParameters
          compute_creep_parameters (const unsigned int composition,
                                    const std::vector<double> &phase_function_values = std::vector<double>(),
                                    const std::vector<unsigned int> &n_phase_transitions_per_composition = std::vector<unsigned int>()) const;
 
          double
          compute_viscosity (const double pressure,
                             const double temperature,
                             const unsigned int composition,
                             const std::vector<double> &phase_function_values = std::vector<double>(),
                             const std::vector<unsigned int> &n_phase_transitions_per_composition = std::vector<unsigned int>()) const;
 
          double
          compute_viscosity (const double pressure,
                             const double temperature,
                             const double grain_size,
                             const unsigned int composition,
                             const std::vector<double> &phase_function_values = std::vector<double>(),
                             const std::vector<unsigned int> &n_phase_transitions_per_composition = std::vector<unsigned int>()) const;
 
          std::pair<double, double>
          compute_strain_rate_and_derivative (const double stress,
                                              const double pressure,
                                              const double temperature,
                                              const DiffusionCreepParameters creep_parameters) const;
 
          std::pair<double, double>
          compute_strain_rate_and_derivative (const double stress,
                                              const double pressure,
                                              const double temperature,
                                              const double grain_size,
                                              const DiffusionCreepParameters creep_parameters) const;
 
          std::pair<double, double>
          compute_log_strain_rate_and_derivative (const double log_stress,
                                                  const double pressure,
                                                  const double temperature,
                                                  const DiffusionCreepParameters creep_parameters) const;
 
          std::pair<double, double>
          compute_log_strain_rate_and_derivative (const double log_stress,
                                                  const double pressure,
                                                  const double temperature,
                                                  const double grain_size,
                                                  const DiffusionCreepParameters creep_parameters) const;
 
        private:
 
          std::vector<double> prefactors;
 
          std::vector<double> stress_exponents;
 
          std::vector<double> grain_size_exponents;
 
          std::vector<double> activation_energies;
 
          std::vector<double> activation_volumes;
 
          double fixed_grain_size;
      };
    }
  }
}
#endif