Line data    Source code

       1             : //* This file is part of the MOOSE framework
       2             : //* https://mooseframework.inl.gov
       3             : //*
       4             : //* All rights reserved, see COPYRIGHT for full restrictions
       5             : //* https://github.com/idaholab/moose/blob/master/COPYRIGHT
       6             : //*
       7             : //* Licensed under LGPL 2.1, please see LICENSE for details
       8             : //* https://www.gnu.org/licenses/lgpl-2.1.html
       9             : 
      10             : #ifdef MOOSE_MFEM_ENABLED
      11             : 
      12             : #include "EigenproblemESProblemOperator.h"
      13             : #include "MFEMEigensolverBase.h"
      14             : 
      15             : namespace Moose::MFEM
      16             : {
      17             : 
      18             : void
      19          26 : EigenproblemESProblemOperator::Solve()
      20             : {
      21          26 :   BuildEquationSystemOperator();
      22             : 
      23          26 :   if (GetEquationSystem()->GetTestVarNames().size() > 1)
      24           0 :     mooseError("Eigenproblems are only supported in single-variable systems");
      25             : 
      26          26 :   auto eigensolver = std::dynamic_pointer_cast<MFEMEigensolverBase>(_problem_data.jacobian_solver);
      27          26 :   eigensolver->setMassMatrix(_mass_rhs);
      28          26 :   eigensolver->setOperator(GetEquationSystem()->_jacobian);
      29          26 :   eigensolver->solve();
      30          26 :   RecoverEigenproblemSolution(_problem_data.gridfunctions, eigensolver.get());
      31          26 : }
      32             : 
      33             : void
      34          26 : EigenproblemESProblemOperator::BuildEquationSystemOperator()
      35             : {
      36          26 :   GetEquationSystem()->BuildEquationSystem();
      37          26 :   GetEquationSystem()->BuildEigenproblemJacobian(_true_x, _mass_rhs);
      38          26 : }
      39             : 
      40             : void
      41          26 : EigenproblemESProblemOperator::RecoverEigenproblemSolution(
      42             :     Moose::MFEM::GridFunctions & gridfunctions, MFEMEigensolverBase * eigensolver)
      43             : {
      44          26 :   mfem::Array<mfem::real_t> eigenvalues;
      45          26 :   eigensolver->getEigenvalues(eigenvalues);
      46             : 
      47          26 :   const auto & trial_var_name = _trial_var_names.at(0);
      48          26 :   const auto & sep = _problem_data.mode_separator;
      49             : 
      50             :   // Distribute the zeroth mode onto the base variable
      51          26 :   gridfunctions.Get(trial_var_name)->Distribute(eigensolver->getEigenvector(0));
      52             : 
      53         156 :   for (int i = 0; i < eigenvalues.Size(); ++i)
      54         260 :     gridfunctions.Get(trial_var_name + sep + std::to_string(i))
      55         130 :         ->Distribute(eigensolver->getEigenvector(i));
      56          26 : }
      57             : 
      58             : } // namespace Moose::MFEM
      59             : 
      60             : #endif