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ntrf_contact.cc
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Tue, Nov 19, 15:04

ntrf_contact.cc
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/**
* @file ntrf_contact.cc
*
* @author David Simon Kammer <david.kammer@epfl.ch>
*
* @date creation: Tue Dec 02 2014
* @date last modification: Fri Feb 23 2018
*
* @brief
*
*
* Copyright (©) 2015-2018 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/>.
*
*/
/* -------------------------------------------------------------------------- */
// simtools
#include "ntrf_contact.hh"
namespace akantu {
/* -------------------------------------------------------------------------- */
NTRFContact::NTRFContact(SolidMechanicsModel & model, const ID & id,
const MemoryID & memory_id)
: NTNBaseContact(model, id, memory_id),
reference_point(model.getSpatialDimension()),
normal(model.getSpatialDimension()) {
AKANTU_DEBUG_IN();
is_ntn_contact = false;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::setReferencePoint(Real x, Real y, Real z) {
AKANTU_DEBUG_IN();
Real coord[3];
coord[0] = x;
coord[1] = y;
coord[2] = z;
UInt dim = this->model.getSpatialDimension();
for (UInt d = 0; d < dim; ++d)
this->reference_point(d) = coord[d];
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::setNormal(Real x, Real y, Real z) {
AKANTU_DEBUG_IN();
UInt dim = this->model.getSpatialDimension();
Real coord[3];
coord[0] = x;
coord[1] = y;
coord[2] = z;
for (UInt d = 0; d < dim; ++d)
this->normal(d) = coord[d];
this->normal.normalize();
this->updateNormals();
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::addSurface(const ID & surf) {
AKANTU_DEBUG_IN();
const Mesh & mesh_ref = this->model.getMesh();
try {
const ElementGroup & boundary = mesh_ref.getElementGroup(surf);
this->contact_surfaces.insert(&boundary);
// find slave nodes
for (auto && node : boundary.getNodeGroup().getNodes()) {
if (not mesh_ref.isPeriodicSlave(node)) {
this->addSplitNode(node);
}
}
} catch (debug::Exception & e) {
AKANTU_DEBUG_INFO("NTRFContact addSurface did not found subboundary "
<< surf
<< " and ignored it. Other procs might have it :)");
}
// synchronize with depending nodes
findBoundaryElements(this->slaves.getArray(), this->slave_elements);
updateInternalData();
syncArrays(_added);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::addNodes(Array<UInt> & nodes) {
AKANTU_DEBUG_IN();
UInt nb_nodes = nodes.size();
UInt nb_compo = nodes.getNbComponent();
for (UInt n = 0; n < nb_nodes; ++n) {
for (UInt c = 0; c < nb_compo; ++c) {
this->addSplitNode(nodes(n, c));
}
}
// synchronize with depending nodes
findBoundaryElements(this->slaves.getArray(), this->slave_elements);
updateInternalData();
syncArrays(_added);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::updateNormals() {
AKANTU_DEBUG_IN();
// normal is the same for all slaves
this->normals.set(this->normal);
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::updateImpedance() {
AKANTU_DEBUG_IN();
UInt nb_contact_nodes = getNbContactNodes();
Real delta_t = this->model.getTimeStep();
AKANTU_DEBUG_ASSERT(delta_t != NAN,
"Time step is NAN. Have you set it already?");
const Array<Real> & mass = this->model.getMass();
for (UInt n = 0; n < nb_contact_nodes; ++n) {
UInt slave = this->slaves(n);
Real imp = this->lumped_boundary_slaves(n) / mass(slave);
imp = 2 / delta_t / imp;
this->impedance(n) = imp;
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::computeRelativeTangentialField(
const Array<Real> & field, Array<Real> & rel_tang_field) const {
AKANTU_DEBUG_IN();
// resize arrays to zero
rel_tang_field.resize(0);
UInt dim = this->model.getSpatialDimension();
Array<Real>::const_iterator<Vector<Real>> it_field = field.begin(dim);
Array<Real>::const_iterator<Vector<Real>> it_normal =
this->normals.getArray().begin(dim);
Vector<Real> rfv(dim);
Vector<Real> np_rfv(dim);
UInt nb_contact_nodes = this->slaves.size();
for (UInt n = 0; n < nb_contact_nodes; ++n) {
// nodes
UInt node = this->slaves(n);
// relative field vector
rfv = it_field[node];
;
// normal projection of relative field
const Vector<Real> & normal_v = it_normal[n];
np_rfv = normal_v;
np_rfv *= rfv.dot(normal_v);
// subtract normal projection from relative field to get the tangential
// projection
rfv -= np_rfv;
rel_tang_field.push_back(rfv);
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::computeNormalGap(Array<Real> & gap) const {
AKANTU_DEBUG_IN();
gap.resize(0);
UInt dim = this->model.getSpatialDimension();
Array<Real>::const_iterator<Vector<Real>> it_cur_pos =
this->model.getCurrentPosition().begin(dim);
Array<Real>::const_iterator<Vector<Real>> it_normal =
this->normals.getArray().begin(dim);
Vector<Real> gap_v(dim);
UInt nb_contact_nodes = this->getNbContactNodes();
for (UInt n = 0; n < nb_contact_nodes; ++n) {
// nodes
UInt node = this->slaves(n);
// gap vector
gap_v = it_cur_pos[node];
gap_v -= this->reference_point;
// length of normal projection of gap vector
const Vector<Real> & normal_v = it_normal[n];
gap.push_back(gap_v.dot(normal_v));
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::computeRelativeNormalField(
const Array<Real> & field, Array<Real> & rel_normal_field) const {
AKANTU_DEBUG_IN();
// resize arrays to zero
rel_normal_field.resize(0);
UInt dim = this->model.getSpatialDimension();
Array<Real>::const_iterator<Vector<Real>> it_field = field.begin(dim);
Array<Real>::const_iterator<Vector<Real>> it_normal =
this->normals.getArray().begin(dim);
UInt nb_contact_nodes = this->getNbContactNodes();
for (UInt n = 0; n < nb_contact_nodes; ++n) {
// nodes
UInt node = this->slaves(n);
const Vector<Real> & field_v = it_field[node];
const Vector<Real> & normal_v = it_normal[n];
rel_normal_field.push_back(field_v.dot(normal_v));
}
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::printself(std::ostream & stream, int indent) const {
AKANTU_DEBUG_IN();
std::string space;
for (Int i = 0; i < indent; i++, space += AKANTU_INDENT)
;
stream << space << "NTRFContact [" << std::endl;
NTNBaseContact::printself(stream, indent);
stream << space << "]" << std::endl;
AKANTU_DEBUG_OUT();
}
/* -------------------------------------------------------------------------- */
void NTRFContact::addDumpFieldToDumper(const std::string & dumper_name,
const std::string & field_id) {
AKANTU_DEBUG_IN();
/*
#ifdef AKANTU_USE_IOHELPER
const Array<UInt> & nodal_filter = this->slaves.getArray();
#define ADD_FIELD(field_id, field, type) \
internalAddDumpFieldToDumper(dumper_name, \
field_id, \
new DumperIOHelper::NodalField< type, true, \
Array<type>, \
Array<UInt> >(field, 0, 0, &nodal_filter))
*/
/*
if(field_id == "displacement") {
ADD_FIELD(field_id, this->model.getDisplacement(), Real);
}
else if(field_id == "contact_pressure") {
internalAddDumpFieldToDumper(dumper_name,
field_id,
new
DumperIOHelper::NodalField<Real>(this->contact_pressure.getArray()));
}
else {*/
NTNBaseContact::addDumpFieldToDumper(dumper_name, field_id);
//}
/*
#undef ADD_FIELD
#endif
*/
AKANTU_DEBUG_OUT();
}
} // namespace akantu

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