discretization.h

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//
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Copyright (C) 2020 - 2024 by the ryujin authors
//
 
#pragma once
 
#include <compile_time_options.h>
 
#include "convenience_macros.h"
#include "geometries/geometry.h"
#include "mpi_ensemble.h"
#include "patterns_conversion.h"
 
#include <deal.II/base/parameter_acceptor.h>
#include <deal.II/distributed/fully_distributed_tria.h>
#include <deal.II/distributed/shared_tria.h>
#include <deal.II/distributed/tria.h>
#include <deal.II/hp/fe_collection.h>
#include <deal.II/hp/mapping_collection.h>
#include <deal.II/hp/q_collection.h>
 
#include <memory>
#include <set>
 
namespace ryujin
{
  enum Boundary : dealii::types::boundary_id {
    do_nothing = 0,
 
    periodic = 1,
 
    slip = 2,
 
    no_slip = 3,
 
    dirichlet = 4,
 
    dynamic = 5,
 
    dirichlet_momentum = 6
  };
 
 
  enum class Ansatz {
    cg_q1,
 
    cg_q2,
 
    cg_q3,
 
    dg_q1,
 
    dg_q2,
 
    dg_q3
  };
 
  enum class MeshType {
    serial,
    parallel_shared,
    parallel_distributed,
    parallel_fullydistributed
  };
} // namespace ryujin
 
#ifndef DOXYGEN
DECLARE_ENUM(ryujin::Boundary,
             LIST({ryujin::Boundary::do_nothing, "do nothing"},
                  {ryujin::Boundary::periodic, "periodic"},
                  {ryujin::Boundary::slip, "slip"},
                  {ryujin::Boundary::no_slip, "no slip"},
                  {ryujin::Boundary::dirichlet, "dirichlet"},
                  {ryujin::Boundary::dynamic, "dynamic"},
                  {ryujin::Boundary::dirichlet_momentum,
                   "dirichlet momentum"}));
 
DECLARE_ENUM(ryujin::Ansatz,
             LIST({ryujin::Ansatz::cg_q1, "cG Q1"},
                  {ryujin::Ansatz::cg_q2, "cG Q2"},
                  {ryujin::Ansatz::cg_q3, "cG Q3"},
                  {ryujin::Ansatz::dg_q1, "dG Q1"},
                  {ryujin::Ansatz::dg_q2, "dG Q2"},
                  {ryujin::Ansatz::dg_q3, "dG Q3"}));
 
DECLARE_ENUM(ryujin::MeshType,
             LIST({ryujin::MeshType::serial, "serial"},
                  {ryujin::MeshType::parallel_shared, "parallel shared"},
                  {ryujin::MeshType::parallel_distributed,
                   "parallel distributed"},
                  {ryujin::MeshType::parallel_fullydistributed,
                   "parallel fullydistributed"}));
#endif
 
namespace ryujin
{
  template <int dim>
  class Discretization : public dealii::ParameterAcceptor
  {
  public:
    Discretization(const MPIEnsemble &mpi_ensemble,
                   const std::string &subsection = "/Discretization");
 
    void prepare(const std::string &base_name);
 
 
    ACCESSOR_READ_ONLY(ansatz)
 
  public:
    bool have_discontinuous_ansatz() const
    {
      switch (ansatz_) {
        /* Continuous Ansatz: */
      case Ansatz::cg_q1:
        [[fallthrough]];
      case Ansatz::cg_q2:
        [[fallthrough]];
      case Ansatz::cg_q3:
        return false;
 
        /* Discontinuous Ansatz: */
      case Ansatz::dg_q1:
        [[fallthrough]];
      case Ansatz::dg_q2:
        [[fallthrough]];
      case Ansatz::dg_q3:
        return true;
      }
 
      AssertThrow(false, dealii::ExcInternalError());
      __builtin_trap();
    }
 
    unsigned int polynomial_degree() const
    {
      switch (ansatz_) {
      case Ansatz::cg_q1:
        [[fallthrough]];
      case Ansatz::dg_q1:
        return 1;
      case Ansatz::cg_q2:
        [[fallthrough]];
      case Ansatz::dg_q2:
        return 2;
      case Ansatz::cg_q3:
        [[fallthrough]];
      case Ansatz::dg_q3:
        return 3;
      }
 
      AssertThrow(false, dealii::ExcInternalError());
      __builtin_trap();
    }
 
 
    bool have_distributed_triangulation() const
    {
      using namespace dealii::parallel;
      const auto *p_t = triangulation_.get();
 
      if (dynamic_cast<const distributed::Triangulation<dim> *>(p_t))
        return true;
      else if (dynamic_cast<const fullydistributed::Triangulation<dim> *>(p_t))
        return true;
      else
        return false;
    }
 
    ACCESSOR(refinement)
 
    
    ACCESSOR(triangulation)
 
    
    ACCESSOR_READ_ONLY(triangulation)
 
    ACCESSOR_READ_ONLY(mapping)
 
    ACCESSOR_READ_ONLY(finite_element)
 
    ACCESSOR_READ_ONLY(finite_element_cg)
 
    ACCESSOR_READ_ONLY(quadrature)
 
    ACCESSOR_READ_ONLY(quadrature_high_order)
 
    ACCESSOR_READ_ONLY(nodal_quadrature)
 
    ACCESSOR_READ_ONLY(quadrature_1d)
 
    ACCESSOR_READ_ONLY(face_quadrature)
 
    ACCESSOR_READ_ONLY(face_nodal_quadrature)
 
  protected:
    const MPIEnsemble &mpi_ensemble_;
 
    std::unique_ptr<dealii::Triangulation<dim>> triangulation_;
    std::unique_ptr<const dealii::hp::MappingCollection<dim>> mapping_;
    std::unique_ptr<const dealii::hp::FECollection<dim>> finite_element_;
    std::unique_ptr<const dealii::hp::FECollection<dim>> finite_element_cg_;
    std::unique_ptr<const dealii::hp::QCollection<dim>> quadrature_;
    std::unique_ptr<const dealii::hp::QCollection<dim>> quadrature_high_order_;
    std::unique_ptr<const dealii::hp::QCollection<dim>> nodal_quadrature_;
    std::unique_ptr<const dealii::hp::QCollection<1>> quadrature_1d_;
    std::unique_ptr<const dealii::hp::QCollection<dim - 1>> face_quadrature_;
    std::unique_ptr<const dealii::hp::QCollection<dim - 1>>
        face_nodal_quadrature_;
 
  private:
 
 
    Ansatz ansatz_;
 
    std::string geometry_;
 
    unsigned int refinement_;
 
    bool mesh_writeout_;
    double mesh_distortion_;
 
 
 
    std::set<std::unique_ptr<Geometry<dim>>> geometry_list_;
 
 
    template <typename Discretization, int dim_, typename Number_>
    friend class SolutionTransfer;
  };
} /* namespace ryujin */