create_operator.h

/*  ______________________________________________________________________
 *
 *  ExaDG - High-Order Discontinuous Galerkin for the Exa-Scale
 *
 *  Copyright (C) 2021 by the ExaDG authors
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *  ______________________________________________________________________
 */
 
#ifndef INCLUDE_EXADG_INCOMPRESSIBLE_NAVIER_STOKES_SPATIAL_DISCRETIZATION_CREATE_OPERATOR_H_
#define INCLUDE_EXADG_INCOMPRESSIBLE_NAVIER_STOKES_SPATIAL_DISCRETIZATION_CREATE_OPERATOR_H_
 
// ExaDG
#include <exadg/incompressible_navier_stokes/spatial_discretization/operator_coupled.h>
#include <exadg/incompressible_navier_stokes/spatial_discretization/operator_dual_splitting.h>
#include <exadg/incompressible_navier_stokes/spatial_discretization/operator_pressure_correction.h>
#include <exadg/incompressible_navier_stokes/spatial_discretization/spatial_operator_base.h>
 
namespace ExaDG
{
namespace IncNS
{
template<int dim, typename Number>
std::shared_ptr<SpatialOperatorBase<dim, Number>>
create_operator(std::shared_ptr<Grid<dim> const>                      grid,
                std::shared_ptr<dealii::Mapping<dim> const>           mapping,
                std::shared_ptr<MultigridMappings<dim, Number>> const multigrid_mappings,
                std::shared_ptr<BoundaryDescriptor<dim> const>        boundary_descriptor,
                std::shared_ptr<FieldFunctions<dim> const>            field_functions,
                Parameters const &                                    parameters,
                std::string const &                                   field,
                MPI_Comm const &                                      mpi_comm)
{
  std::shared_ptr<SpatialOperatorBase<dim, Number>> pde_operator;
 
  // initialize pde_operator
  if(parameters.temporal_discretization == TemporalDiscretization::BDFCoupledSolution)
  {
    pde_operator = std::make_shared<OperatorCoupled<dim, Number>>(grid,
                                                                  mapping,
                                                                  multigrid_mappings,
                                                                  boundary_descriptor,
                                                                  field_functions,
                                                                  parameters,
                                                                  field,
                                                                  mpi_comm);
  }
  else if(parameters.temporal_discretization == TemporalDiscretization::BDFDualSplittingScheme)
  {
    pde_operator = std::make_shared<OperatorDualSplitting<dim, Number>>(grid,
                                                                        mapping,
                                                                        multigrid_mappings,
                                                                        boundary_descriptor,
                                                                        field_functions,
                                                                        parameters,
                                                                        field,
                                                                        mpi_comm);
  }
  else if(parameters.temporal_discretization == TemporalDiscretization::BDFPressureCorrection or
          // we can not instantiate the base class and instantiate an arbitrary deriving
          // class for InterpolateAnalyticalSolution.
          parameters.temporal_discretization ==
            TemporalDiscretization::InterpolateAnalyticalSolution)
  {
    pde_operator = std::make_shared<OperatorPressureCorrection<dim, Number>>(grid,
                                                                             mapping,
                                                                             multigrid_mappings,
                                                                             boundary_descriptor,
                                                                             field_functions,
                                                                             parameters,
                                                                             field,
                                                                             mpi_comm);
  }
  else
  {
    AssertThrow(false, dealii::ExcMessage("Not implemented."));
  }
 
  return pde_operator;
}
 
} // namespace IncNS
} // namespace ExaDG
 
 
 
#endif /* INCLUDE_EXADG_INCOMPRESSIBLE_NAVIER_STOKES_SPATIAL_DISCRETIZATION_CREATE_OPERATOR_H_ */