free_surface.h

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// ------------------------------------------------------
//
// SPDX-License-Identifier: GPL-2.0-or-later
//
// SPDX-FileCopyrightText: Copyright (C) 2011-2025 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_free_surface_h
#define _aspect_mesh_deformation_free_surface_h

#include <aspect/mesh_deformation/interface.h>

#include <aspect/simulator_access.h>
#include <aspect/simulator/assemblers/interface.h>


namespace aspect
{
  namespace MeshDeformation
  {
    template <int dim>
    class FreeSurface : public Interface<dim>, public SimulatorAccess<dim>
    {
      public:
        void initialize() override;

        void set_assemblers(const SimulatorAccess<dim> &simulator_access,
                            aspect::Assemblers::Manager<dim> &assemblers) const;


        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 project_velocity_onto_boundary (const DoFHandler<dim> &free_surface_dof_handler,
                                             const IndexSet &mesh_locally_owned,
                                             const IndexSet &mesh_locally_relevant,
                                             LinearAlgebra::Vector &output) const;

        struct SurfaceAdvection
        {
          enum Direction { normal, vertical };
        };

        typename SurfaceAdvection::Direction advection_direction;
    };
  }
}


#endif