mofem/html/tutorial_magnetostatic.html

/** \file magnetostatic.cpp

 * \example magnetostatic.cpp

 * \ingroup maxwell_element

 *

 * \brief Example implementation of magnetostatics problem

 *

 */


#include <BasicFiniteElements.hpp>

#include <MagneticElement.hpp>

using namespace MoFEM;


static char help[] = "-my_file mesh file name\n"

                     "-my_order default approximation order\n"

                     "-my_is_partitioned set if mesh is partitioned\n"

                     "-regression_test check solution vector against expected value\n"

                     "\n\n";


int main(int argc, char *argv[]) {


  const string default_options = "-ksp_type fgmres \n"

                                 "-pc_type lu \n"

                                 "-pc_factor_mat_solver_type mumps \n"

                                 "-mat_mumps_icntl_20 0 \n"

                                 "-mat_mumps_icntl_13 1 \n"

                                 "-ksp_monitor \n"

                                 "-mat_mumps_icntl_24 1 \n"

                                 "-mat_mumps_icntl_13 1 \n";


  string param_file = "param_file.petsc";

  if (!static_cast<bool>(ifstream(param_file))) {

    std::ofstream file(param_file.c_str(), std::ios::ate);

    if (file.is_open()) {

      file << default_options;

      file.close();

    }

  }


  MoFEM::Core::Initialize(&argc, &argv, param_file.c_str(), help);


  try {


    moab::Core mb_instance;

    moab::Interface &moab = mb_instance;


    ParallelComm *pcomm = ParallelComm::get_pcomm(&moab, MYPCOMM_INDEX);

    auto moab_comm_wrap =

        boost::make_shared<WrapMPIComm>(PETSC_COMM_WORLD, false);

    if (pcomm == NULL)

      pcomm =

          new ParallelComm(&moab, moab_comm_wrap->get_comm());


    // Read parameters from line command

    PetscBool flg_file;

    char mesh_file_name[255];

    PetscInt order = 2;

    PetscBool is_partitioned = PETSC_FALSE;

    PetscBool regression_test = PETSC_FALSE;


    CHKERR PetscOptionsBegin(PETSC_COMM_WORLD, "", "Magnetostatics options",

                             "none");

    CHKERR PetscOptionsString("-my_file", "mesh file name", "", "mesh.h5m",

                              mesh_file_name, 255, &flg_file);

    CHKERR PetscOptionsInt("-my_order", "default approximation order", "",

                           order, &order, PETSC_NULL);

    CHKERR PetscOptionsBool(

        "-regression_test",

        "if set norm of solution vector is check agains expected value ",

        "",

        PETSC_FALSE, &regression_test, PETSC_NULL);


    ierr = PetscOptionsEnd();

    CHKERRG(ierr);


    // Read mesh to MOAB

    const char *option;

    option = "PARALLEL=READ_PART;"

             "PARALLEL_RESOLVE_SHARED_ENTS;"

             "PARTITION=PARALLEL_PARTITION;";

    CHKERR moab.load_file(mesh_file_name, 0, option);


    // Create mofem interface

    MoFEM::Core core(moab);

    MoFEM::Interface &m_field = core;


    MagneticElement magnetic(m_field);

    magnetic.blockData.oRder = order;

    CHKERR magnetic.getNaturalBc();

    CHKERR magnetic.getEssentialBc();

    CHKERR magnetic.createFields();

    CHKERR magnetic.createElements();

    CHKERR magnetic.createProblem();

    CHKERR magnetic.solveProblem(regression_test == PETSC_TRUE);

    CHKERR magnetic.postProcessResults();

    CHKERR magnetic.destroyProblem();


    // write solution to file (can be used by lorentz_force example)

    CHKERR moab.write_file("solution.h5m", "MOAB", "PARALLEL=WRITE_PART");

  }

  CATCH_ERRORS;


  MoFEM::Core::Finalize();

  return 0;

}