diffusion.h

Go to the documentation of this file.

// ------------------------------------------------------
//
// SPDX-License-Identifier: GPL-2.0-or-later
//
// SPDX-FileCopyrightText: Copyright (C) 2020-2026 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_mesh_deformation_diffusion_h
#define _aspect_mesh_deformation_diffusion_h

#include <aspect/mesh_deformation/interface.h>
#include <aspect/simulator_access.h>
#include <aspect/geometry_model/initial_topography_model/interface.h>


namespace aspect
{
  namespace MeshDeformation
  {
    template <int dim>
    class Diffusion : public Interface<dim>, public SimulatorAccess<dim>
    {
      public:
        Diffusion();

        void initialize() override;

        void update() override;



        void
        compute_velocity_constraints_on_boundary(const DoFHandler<dim> &mesh_deformation_dof_handler,
                                                 AffineConstraints<double> &mesh_velocity_constraints,
                                                 const std::set<types::boundary_id> &boundary_ids) const override;

        bool needs_surface_stabilization () const override;

        static
        void declare_parameters (ParameterHandler &prm);

        void parse_parameters (ParameterHandler &prm) override;

      private:
        void diffuse_boundary (const DoFHandler<dim> &free_surface_dof_handler,
                               const IndexSet &mesh_locally_owned,
                               const IndexSet &mesh_locally_relevant,
                               LinearAlgebra::Vector &output,
                               const std::set<types::boundary_id> &boundary_ids) const;

        void check_diffusion_time_step (const DoFHandler<dim> &mesh_deformation_dof_handler,
                                        const std::set<types::boundary_id> &boundary_ids) const;

        double diffusivity;

        unsigned int timesteps_between_diffusion;

        bool apply_diffusion;

        std::set<types::boundary_id> additional_tangential_mesh_boundary_indicators;
    };
  }
}


#endif