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solid_mechanics_model_mass.cc
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Tue, May 7, 13:34

solid_mechanics_model_mass.cc
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/**
* @file solid_mechanics_model_mass.cc
*
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Tue Oct 05 2010
* @date last modification: Fri Oct 16 2015
*
* @brief function handling mass computation
*
* @section LICENSE
*
* Copyright (©) 2010-2012, 2014, 2015 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 "integrator_gauss.hh"
#include "material.hh"
#include "model_solver.hh"
#include "shape_lagrange.hh"
#include "solid_mechanics_model.hh"
/* -------------------------------------------------------------------------- */
namespace akantu {
class ComputeRhoFunctor {
public:
explicit ComputeRhoFunctor(const SolidMechanicsModel & model)
: model(model){};
void operator()(Matrix<Real> & rho, const Element & element) const {
const Array<UInt> & mat_indexes =
model.getMaterialByElement(element.type, element.ghost_type);
Real mat_rho =
model.getMaterial(mat_indexes(element.element)).getParam("rho");
rho.set(mat_rho);
}
private:
const SolidMechanicsModel & model;
};
/* -------------------------------------------------------------------------- */
void SolidMechanicsModel::assembleMassLumped() {
AKANTU_DEBUG_IN();
if(not need_to_reassemble_lumped_mass) return;
UInt nb_nodes = mesh.getNbNodes();
if (this->mass == nullptr) {
std::stringstream sstr_mass;
sstr_mass << id << ":mass";
mass =
&(alloc<Real>(sstr_mass.str(), nb_nodes, Model::spatial_dimension, 0));
} else {
mass->clear();
}
if (!this->getDOFManager().hasLumpedMatrix("M")) {
this->getDOFManager().getNewLumpedMatrix("M");
}
this->getDOFManager().clearLumpedMatrix("M");
assembleMassLumped(_not_ghost);
assembleMassLumped(_ghost);
this->getDOFManager().getLumpedMatrixPerDOFs("displacement", "M",
*(this->mass));
/// for not connected nodes put mass to one in order to avoid
#if !defined(AKANTU_NDEBUG)
bool has_unconnected_nodes = false;
auto mass_it =
mass->begin_reinterpret(mass->size() * mass->getNbComponent());
auto mass_end =
mass->end_reinterpret(mass->size() * mass->getNbComponent());
for (; mass_it != mass_end; ++mass_it) {
if (std::abs(*mass_it) < std::numeric_limits<Real>::epsilon() ||
Math::isnan(*mass_it)) {
has_unconnected_nodes = true;
break;
}
}
if (has_unconnected_nodes)
AKANTU_DEBUG_WARNING("There are nodes that seem to not be connected to any "
"elements, beware that they have lumped mass of 0.");
#endif
this->synchronize(_gst_smm_mass);
need_to_reassemble_lumped_mass = false;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void SolidMechanicsModel::assembleMass() {
AKANTU_DEBUG_IN();
if(not need_to_reassemble_mass) return;
this->getDOFManager().clearMatrix("M");
assembleMass(_not_ghost);
need_to_reassemble_mass = false;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void SolidMechanicsModel::assembleMassLumped(GhostType ghost_type) {
AKANTU_DEBUG_IN();
auto & fem = getFEEngineClass<MyFEEngineType>();
ComputeRhoFunctor compute_rho(*this);
for (auto type : mesh.elementTypes(Model::spatial_dimension, ghost_type)) {
fem.assembleFieldLumped(compute_rho, "M", "displacement",
this->getDOFManager(), type, ghost_type);
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void SolidMechanicsModel::assembleMass(GhostType ghost_type) {
AKANTU_DEBUG_IN();
auto & fem = getFEEngineClass<MyFEEngineType>();
ComputeRhoFunctor compute_rho(*this);
for (auto type : mesh.elementTypes(Model::spatial_dimension, ghost_type)) {
fem.assembleFieldMatrix(compute_rho, "M", "displacement",
this->getDOFManager(), type, ghost_type);
}
AKANTU_DEBUG_OUT();
}
} // namespace akantu

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