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 "MFEMCGSolver.h"
      13             : #include "MFEMProblem.h"
      14             : 
      15             : registerMooseObject("MooseApp", MFEMCGSolver);
      16             : 
      17             : InputParameters
      18        9336 : MFEMCGSolver::validParams()
      19             : {
      20        9336 :   InputParameters params = MFEMSolverBase::validParams();
      21       18672 :   params.addClassDescription("MFEM native solver for the iterative solution of MFEM equation "
      22             :                              "systems using the conjugate gradient method.");
      23             : 
      24       37344 :   params.addParam<mfem::real_t>("l_tol", 1e-5, "Set the relative tolerance.");
      25       37344 :   params.addParam<mfem::real_t>("l_abs_tol", 1e-50, "Set the absolute tolerance.");
      26       37344 :   params.addParam<int>("l_max_its", 10000, "Set the maximum number of iterations.");
      27       37344 :   params.addParam<int>("print_level", 2, "Set the solver verbosity.");
      28       28008 :   params.addParam<UserObjectName>("preconditioner", "Optional choice of preconditioner to use.");
      29             : 
      30        9336 :   return params;
      31           0 : }
      32             : 
      33          52 : MFEMCGSolver::MFEMCGSolver(const InputParameters & parameters) : MFEMSolverBase(parameters)
      34             : {
      35          52 :   constructSolver(parameters);
      36          52 : }
      37             : 
      38             : void
      39          52 : MFEMCGSolver::constructSolver(const InputParameters &)
      40             : {
      41          52 :   auto solver = std::make_unique<mfem::CGSolver>(getMFEMProblem().getComm());
      42         104 :   solver->SetRelTol(getParam<mfem::real_t>("l_tol"));
      43         104 :   solver->SetAbsTol(getParam<mfem::real_t>("l_abs_tol"));
      44         104 :   solver->SetMaxIter(getParam<int>("l_max_its"));
      45         104 :   solver->SetPrintLevel(getParam<int>("print_level"));
      46          52 :   setPreconditioner(*solver);
      47          52 :   _solver = std::move(solver);
      48          52 : }
      49             : 
      50             : void
      51          97 : MFEMCGSolver::updateSolver(mfem::ParBilinearForm & a, mfem::Array<int> & tdofs)
      52             : {
      53          97 :   if (_lor && _preconditioner)
      54           0 :     mooseError("LOR solver cannot take a preconditioner");
      55             : 
      56          97 :   if (_preconditioner)
      57             :   {
      58          93 :     _preconditioner->updateSolver(a, tdofs);
      59          93 :     setPreconditioner(static_cast<mfem::CGSolver &>(*_solver));
      60             :   }
      61           4 :   else if (_lor)
      62             :   {
      63           2 :     checkSpectralEquivalence(a);
      64           2 :     auto lor_solver = new mfem::LORSolver<mfem::CGSolver>(a, tdofs);
      65           4 :     lor_solver->GetSolver().SetRelTol(getParam<mfem::real_t>("l_tol"));
      66           4 :     lor_solver->GetSolver().SetAbsTol(getParam<mfem::real_t>("l_abs_tol"));
      67           4 :     lor_solver->GetSolver().SetMaxIter(getParam<int>("l_max_its"));
      68           4 :     lor_solver->GetSolver().SetPrintLevel(getParam<int>("print_level"));
      69             : 
      70           2 :     _solver.reset(lor_solver);
      71             :   }
      72          97 : }
      73             : 
      74             : #endif