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phasefield.cc
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/**
* @file pahsefield.cc
*
* @author Mohit Pundir <mohit.pundir@epfl.ch>
*
* @date creation: Mon Mar 2 2020
* @date last modification: Mon Mar 2 2020
*
* @brief Implementation of the common part of the phasefield class
*
* @section LICENSE
*
* Copyright (©) 2010-2018 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 "phasefield.hh"
#include "phase_field_model.hh"
/* -------------------------------------------------------------------------- */
namespace akantu {
/* -------------------------------------------------------------------------- */
PhaseField::PhaseField(PhaseFieldModel & model, const ID & id)
: Memory(id, model.getMemoryID()), Parsable(ParserType::_phasefield, id),
fem(model.getFEEngine()), name(""), model(model),
spatial_dimension(this->model.getSpatialDimension()),
element_filter("element_filter", id, this->memory_id),
damage("damage", *this), phi("phi", *this),
strain("strain", *this), driving_force("driving_force", *this),
damage_energy("damage_energy", *this),
damage_energy_density("damage_energy_density", *this) {
AKANTU_DEBUG_IN();
/// for each connectivity types allocate the element filer array of the
/// material
element_filter.initialize(model.getMesh(),
_spatial_dimension = spatial_dimension,
_element_kind = _ek_regular);
this->initialize();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
PhaseField::PhaseField(PhaseFieldModel & model, UInt dim, const Mesh & mesh,
FEEngine & fe_engine, const ID & id)
: Memory(id, model.getMemoryID()), Parsable(ParserType::_phasefield, id),
fem(fe_engine), name(""), model(model),
spatial_dimension(this->model.getSpatialDimension()),
element_filter("element_filter", id, this->memory_id),
damage("damage", *this, dim, fe_engine, this->element_filter),
phi("phi", *this, dim, fe_engine, this->element_filter),
strain("strain", *this, dim, fe_engine, this->element_filter),
driving_force("driving_force", *this, dim, fe_engine, this->element_filter),
damage_energy("damage_energy", *this, dim, fe_engine, this->element_filter),
damage_energy_density("damage_energy_density", *this, dim, fe_engine,
this->element_filter){
AKANTU_DEBUG_IN();
/// for each connectivity types allocate the element filer array of the
/// material
element_filter.initialize(mesh,
_spatial_dimension = spatial_dimension,
_element_kind = _ek_regular);
this->initialize();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
PhaseField::~PhaseField() = default;
/* -------------------------------------------------------------------------- */
void PhaseField::initialize() {
registerParam("name", name, std::string(), _pat_parsable | _pat_readable);
registerParam("l0", l0, Real(0.), _pat_parsmod,
"length scale parameter");
registerParam("gc", g_c, _pat_parsmod,
"critical local fracture energy density");
registerParam("E", E, _pat_parsmod, "Young's modulus");
registerParam("nu", nu, _pat_parsmod, "Poisson ratio");
damage.initialize(1);
phi.initialize(1);
driving_force.initialize(1);
strain.initialize(spatial_dimension * spatial_dimension);
damage_energy_density.initialize(1);
damage_energy.initialize(1);
}
/* -------------------------------------------------------------------------- */
void PhaseField::initPhaseField() {
AKANTU_DEBUG_IN();
this->phi.initializeHistory();
this->resizeInternals();
updateInternalParameters();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void PhaseField::resizeInternals() {
AKANTU_DEBUG_IN();
for (auto it = internal_vectors_real.begin();
it != internal_vectors_real.end(); ++it)
it->second->resize();
for (auto it = internal_vectors_uint.begin();
it != internal_vectors_uint.end(); ++it)
it->second->resize();
for (auto it = internal_vectors_bool.begin();
it != internal_vectors_bool.end(); ++it)
it->second->resize();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void PhaseField::updateInternalParameters() {
this->lambda = this->nu * this->E / ((1 + this->nu) * (1 - 2 * this->nu));
this->mu = this->E / (2 * (1 + this->nu));
}
/* -------------------------------------------------------------------------- */
void PhaseField::computeAllDrivingForces(GhostType ghost_type) {
AKANTU_DEBUG_IN();
UInt spatial_dimension = model.getSpatialDimension();
for (const auto & type :
element_filter.elementTypes(spatial_dimension, ghost_type)) {
Array<UInt> & elem_filter = element_filter(type, ghost_type);
if (elem_filter.size() == 0)
continue;
computeDrivingForce(type, ghost_type);
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void PhaseField::assembleInternalForces(GhostType ghost_type) {
AKANTU_DEBUG_IN();
auto & internal_forces = model.getInternalForce();
for (auto type : element_filter.elementTypes(_ghost_type = ghost_type)) {
Array<UInt> & elem_filter = element_filter(type, ghost_type);
if (elem_filter.size() == 0)
continue;
UInt nb_element = elem_filter.size();
UInt nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
UInt nb_quadrature_points = fem.getNbIntegrationPoints(type, ghost_type);
Array<Real> nt_driving_force(nb_quadrature_points, nb_nodes_per_element);
fem.computeNtb(driving_force(type, ghost_type), nt_driving_force, type,
ghost_type, elem_filter);
Array<Real> int_nt_driving_force(nb_element, nb_nodes_per_element);
fem.integrate(nt_driving_force, int_nt_driving_force,
nb_nodes_per_element, type, ghost_type, elem_filter);
model.getDOFManager().assembleElementalArrayLocalArray(
int_nt_driving_force, internal_forces, type, ghost_type, 1,
elem_filter);
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void PhaseField::assembleStiffnessMatrix(GhostType ghost_type) {
AKANTU_DEBUG_IN();
AKANTU_DEBUG_INFO("Assemble the new stiffness matrix");
for (auto type : element_filter.elementTypes(spatial_dimension, ghost_type)) {
Array<UInt> & elem_filter = element_filter(type, ghost_type);
if (elem_filter.size() == 0) {
AKANTU_DEBUG_OUT();
return;
}
auto nb_element = elem_filter.size();
auto nb_nodes_per_element = Mesh::getNbNodesPerElement(type);
auto nb_quadrature_points = fem.getNbIntegrationPoints(type, ghost_type);
auto nt_b_n = std::make_unique<Array<Real>>(
nb_element * nb_quadrature_points,
nb_nodes_per_element * nb_nodes_per_element, "N^t*b*N");
auto bt_d_b = std::make_unique<Array<Real>>(
nb_element * nb_quadrature_points,
nb_nodes_per_element * nb_nodes_per_element, "B^t*D*B");
// damage_energy_on_qpoints = gc/l0 + phi = scalar
auto & damage_energy_density_vect =
damage_energy_density(type, ghost_type);
// damage_energy_on_qpoints = gc*l0 = scalar
auto & damage_energy_vect =
damage_energy(type, ghost_type);
fem.computeBtDB(damage_energy_vect, *bt_d_b, 2, type, ghost_type,
elem_filter);
fem.computeNtbN(damage_energy_density_vect, *nt_b_n, 2, type, ghost_type,
elem_filter);
/// compute @f$ K_{\grad d} = \int_e \mathbf{N}^t * \mathbf{w} *
/// \mathbf{N}@f$
auto K_n = std::make_unique<Array<Real>>(
nb_element, nb_nodes_per_element * nb_nodes_per_element, "K_n");
fem.integrate(*nt_b_n, *K_n, nb_nodes_per_element * nb_nodes_per_element,
type, ghost_type, elem_filter);
model.getDOFManager().assembleElementalMatricesToMatrix(
"K", "damage", *K_n, type, _not_ghost, _symmetric, elem_filter);
/// compute @f$ K_{\grad d} = \int_e \mathbf{B}^t * \mathbf{W} *
/// \mathbf{B}@f$
auto K_b = std::make_unique<Array<Real>>(
nb_element, nb_nodes_per_element * nb_nodes_per_element, "K_b");
fem.integrate(*bt_d_b, *K_b, nb_nodes_per_element * nb_nodes_per_element,
type, ghost_type, elem_filter);
model.getDOFManager().assembleElementalMatricesToMatrix(
"K", "damage", *K_b, type, _not_ghost, _symmetric, elem_filter);
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void PhaseField::beforeSolveStep() {
this->savePreviousState();
}
/* -------------------------------------------------------------------------- */
void PhaseField::afterSolveStep() {
}
/* -------------------------------------------------------------------------- */
void PhaseField::savePreviousState() {
AKANTU_DEBUG_IN();
for (auto pair : internal_vectors_real)
if (pair.second->hasHistory())
pair.second->saveCurrentValues();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void PhaseField::printself(std::ostream & stream, int indent) const {
std::string space(indent, AKANTU_INDENT);
std::string type = getID().substr(getID().find_last_of(':') + 1);
stream << space << "PhaseField Material " << type << " [" << std::endl;
Parsable::printself(stream, indent);
stream << space << "]" << std::endl;
}
}

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