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rAKA/src/model/non_linear_solver_lumped.cc
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non_linear_solver_lumped.cc
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/**
* @file non_linear_solver_lumped.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Tue Feb 16 2016
* @date last modification: Wed Jan 31 2018
*
* @brief Implementation of the default NonLinearSolver
*
* @section LICENSE
*
* Copyright (©) 2016-2018 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "non_linear_solver_lumped.hh"
#include "communicator.hh"
#include "dof_manager_default.hh"
#include "solver_callback.hh"
/* -------------------------------------------------------------------------- */
namespace akantu {
/* -------------------------------------------------------------------------- */
NonLinearSolverLumped::NonLinearSolverLumped(
DOFManagerDefault & dof_manager,
const NonLinearSolverType & non_linear_solver_type, const ID & id,
UInt memory_id)
: NonLinearSolver(dof_manager, non_linear_solver_type, id, memory_id),
dof_manager(dof_manager) {
this->supported_type.insert(_nls_lumped);
this->checkIfTypeIsSupported();
this->registerParam("b_a2x", this->alpha, 1., _pat_parsmod,
"Conversion coefficient between x and A^{-1} b");
}
/* -------------------------------------------------------------------------- */
NonLinearSolverLumped::~NonLinearSolverLumped() = default;
/* ------------------------------------------------------------------------ */
void NonLinearSolverLumped::solve(SolverCallback & solver_callback) {
this->dof_manager.updateGlobalBlockedDofs();
solver_callback.predictor();
auto & x = this->dof_manager.getGlobalSolution();
const auto & b = this->dof_manager.getResidual();
x.resize(b.size());
this->dof_manager.updateGlobalBlockedDofs();
const Array<bool> & blocked_dofs = this->dof_manager.getGlobalBlockedDOFs();
solver_callback.assembleResidual();
const auto & A = this->dof_manager.getLumpedMatrix("M");
// alpha is the conversion factor from from force/mass to acceleration needed
// in model coupled with atomistic \todo find a way to define alpha per dof
// type
this->solveLumped(A, x, b, blocked_dofs, alpha);
this->dof_manager.splitSolutionPerDOFs();
solver_callback.corrector();
}
/* -------------------------------------------------------------------------- */
void NonLinearSolverLumped::solveLumped(const Array<Real> & A, Array<Real> & x,
const Array<Real> & b,
const Array<bool> & blocked_dofs,
Real alpha) {
auto A_it = A.begin();
auto x_it = x.begin();
auto x_end = x.end();
auto b_it = b.begin();
auto blocked_it = blocked_dofs.begin();
for (; x_it != x_end; ++x_it, ++b_it, ++A_it, ++blocked_it) {
if (!(*blocked_it)) {
*x_it = alpha * (*b_it / *A_it);
}
}
}
/* -------------------------------------------------------------------------- */
} // akantu
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