drucker_prager.h

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// ------------------------------------------------------
//
// SPDX-License-Identifier: GPL-2.0-or-later
//
// SPDX-FileCopyrightText: Copyright (C) 2019-2026 by the ASPECT authors.
//
// This file is part of ASPECT.
//
// Detailed license information governing the source code and
// contributions can be found in the folder LICENSES and in
// LICENSE and CONTRIBUTING.md at the top level directory.
//
// ------------------------------------------------------

#ifndef _aspect_material_model_rheology_drucker_prager_h
#define _aspect_material_model_rheology_drucker_prager_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 DruckerPragerParameters
      {
        double angle_internal_friction;

        double angle_dilation;

        double cohesion;

        double yield_stress_prefactor;

        double max_yield_stress;

        DruckerPragerParameters();
      };

      template <int dim>
      class DruckerPrager : public ::aspect::SimulatorAccess<dim>
      {
        public:
          DruckerPrager();
          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 DruckerPragerParameters
          compute_drucker_prager_parameters (const unsigned int composition,
                                             const std::vector<double> &phase_function_values = {},
                                             const std::vector<unsigned int> &n_phase_transitions_per_composition = {}) const;

          DEAL_II_DEPRECATED
          double
          compute_yield_stress (const double cohesion,
                                const double angle_internal_friction,
                                const double pressure,
                                const double max_yield_stress) const;

          double
          compute_yield_stress (const double pressure,
                                const DruckerPragerParameters &p) const;

          DEAL_II_DEPRECATED
          double
          compute_viscosity (const double cohesion,
                             const double angle_internal_friction,
                             const double pressure,
                             const double effective_strain_rate,
                             const double max_yield_stress,
                             const double non_yielding_viscosity = std::numeric_limits<double>::infinity()) const;

          double
          compute_viscosity (const double pressure,
                             const double effective_strain_rate,
                             const DruckerPragerParameters &p,
                             const double non_yielding_viscosity = std::numeric_limits<double>::infinity()) const;

          std::pair<double, double>
          compute_strain_rate_and_derivative (const double stress,
                                              const double pressure,
                                              const DruckerPragerParameters &p) const;

          double
          compute_derivative (const double angle_internal_friction,
                              const double effective_strain_rate) const;

          std::pair<double,double>
          compute_dilation_terms_for_stokes_system(const DruckerPragerParameters &drucker_prager_parameters,
                                                   const double non_yielding_viscosity,
                                                   const double effective_strain_rate) const;

        private:

          std::vector<double> angles_internal_friction;

          std::vector<double> angles_dilation;

          std::vector<double> cohesions;

          std::vector<double> yield_stress_prefactors;

          std::vector<double> max_yield_stresses;

          bool use_plastic_damper;

          double damper_viscosity;
      };
    }
  }
}
#endif