mesh_adaptor.h

Go to the documentation of this file.

//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Copyright (C) 2024 by the ryujin authors
//
 
#pragma once
 
#include "offline_data.h"
 
#include <deal.II/base/parameter_acceptor.h>
 
#include <random>
 
namespace ryujin
{
  enum class AdaptationStrategy {
    global_refinement,
 
    random_adaptation,
  };
 
  enum class MarkingStrategy {
    fixed_number,
  };
 
  enum class TimePointSelectionStrategy {
    fixed_adaptation_time_points,
  };
} // namespace ryujin
 
#ifndef DOXYGEN
DECLARE_ENUM(ryujin::AdaptationStrategy,
             LIST({ryujin::AdaptationStrategy::global_refinement,
                   "global refinement"},
                  {ryujin::AdaptationStrategy::random_adaptation,
                   "random adaptation"}, ));
 
DECLARE_ENUM(ryujin::MarkingStrategy,
             LIST({ryujin::MarkingStrategy::fixed_number, "fixed number"}, ));
 
DECLARE_ENUM(
    ryujin::TimePointSelectionStrategy,
    LIST({ryujin::TimePointSelectionStrategy::fixed_adaptation_time_points,
          "fixed adaptation time points"}, ));
#endif
 
namespace ryujin
{
  template <typename Description, int dim, typename Number = double>
  class MeshAdaptor final : public dealii::ParameterAcceptor
  {
  public:
 
    using HyperbolicSystem = typename Description::HyperbolicSystem;
    using ParabolicSystem = typename Description::ParabolicSystem;
 
    using View =
        typename Description::template HyperbolicSystemView<dim, Number>;
 
    static constexpr auto problem_dimension = View::problem_dimension;
 
    using StateVector = typename View::StateVector;
 
    using ScalarVector = Vectors::ScalarVector<Number>;
 
 
 
    MeshAdaptor(const MPI_Comm &mpi_communicator,
                const OfflineData<dim, Number> &offline_data,
                const HyperbolicSystem &hyperbolic_system,
                const ParabolicSystem &parabolic_system,
                const std::string &subsection = "/MeshAdaptor");
 
    void prepare(const Number t);
 
    void analyze(const StateVector &state_vector,
                 const Number t,
                 unsigned int cycle);
 
    ACCESSOR_READ_ONLY(need_mesh_adaptation)
 
    
    void mark_cells_for_coarsening_and_refinement(
        dealii::Triangulation<dim> &triangulation) const;
 
  private:
 
    AdaptationStrategy adaptation_strategy_;
    std::uint_fast64_t random_adaptation_mersenne_twister_seed_;
 
    MarkingStrategy marking_strategy_;
    double fixed_number_refinement_fraction_;
    double fixed_number_coarsening_fraction_;
 
    TimePointSelectionStrategy time_point_selection_strategy_;
    std::vector<Number> adaptation_time_points_;
 
 
 
    const MPI_Comm &mpi_communicator_;
 
    dealii::SmartPointer<const OfflineData<dim, Number>> offline_data_;
    dealii::SmartPointer<const HyperbolicSystem> hyperbolic_system_;
    dealii::SmartPointer<const ParabolicSystem> parabolic_system_;
 
    bool need_mesh_adaptation_;
 
    mutable std::mt19937_64 mersenne_twister_;
  };
 
} // namespace ryujin