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stimulation_addforce.cc
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Wed, Aug 21, 06:39

stimulation_addforce.cc
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/**
* @file stimulation_addforce.cc
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
*
* @date Wed Jul 09 21:59:47 2014
*
* @brief Add a force to a set of atoms/nodes/points
*
* @section LICENSE
*
* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* LibMultiScale 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.
*
* LibMultiScale 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 LibMultiScale. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "stimulation_addforce.hh"
#include "lib_continuum.hh"
#include "lib_dd.hh"
#include "lib_md.hh"
#include "lm_common.hh"
#include "lm_communicator.hh"
#include "ref_point_data.hh"
/* -------------------------------------------------------------------------- */
__BEGIN_LIBMULTISCALE__
/* -------------------------------------------------------------------------- */
StimulationAddForce::StimulationAddForce(const std::string &name)
: LMObject(name) {
for (UInt i = 0; i < 3; ++i) {
total_force[i] = 0.0;
per_atom_force[i] = 0.0;
}
}
/* -------------------------------------------------------------------------- */
StimulationAddForce::~StimulationAddForce() {}
/* -------------------------------------------------------------------------- */
template <typename Cont> void StimulationAddForce::stimulate(Cont &cont) {
constexpr UInt Dim = Cont::Dim;
UInt cpt = cont.size();
CommGroup &group = cont.getCommGroup();
UInt rank = group.getMyRank();
group.allReduce(&cpt, 1, "reduce total number of points concerned", OP_SUM);
if (rank == 0) {
for (UInt i = 0; i < Dim; ++i)
DUMP("In direction " << i << " add an additional force "
<< total_force[i] / (Real)cpt + per_atom_force[i],
DBG_INFO);
}
for (auto &&at : cont) {
for (UInt i = 0; i < Dim; ++i) {
at.force()[i] += total_force[i] / Real(cpt) + per_atom_force[i];
}
}
}
/* -------------------------------------------------------------------------- */
/* LMDESC ADDFORCE
Add a force to a set of atoms/nodes/points \\
The stimulator is provided a force $f^{req}$ and for each atoms/nodes/points
in the
input the stimulator do:
$$ f += \frac{1}{\#points} f^{total} + f^{per-atom-force} $$
*/
/* LMEXAMPLE
STIMULATION force ADDFORCE TOTAL_FORCE 1 \\
STIMULATION force ADDFORCE PER_ATOM_FORCE 0.001
*/
void StimulationAddForce::declareParams() {
StimulationInterface::declareParams();
this->changeDefault("STAGE", PRE_STEP3);
/* LMKEYWORD TOTAL_FORCE
Give the total force vector requested to be added. This quantity will
be divided by the number of atoms in the container.
*/
this->parseVectorKeyword("TOTAL_FORCE", spatial_dimension, total_force,
VEC_DEFAULTS(0., 0., 0.));
/* LMKEYWORD PER_ATOM_FORCE
Give the force vector requested to be added on each atom.
*/
this->parseVectorKeyword("PER_ATOM_FORCE", spatial_dimension, per_atom_force,
VEC_DEFAULTS(0., 0., 0.));
}
/* -------------------------------------------------------------------------- */
DECLARE_STIMULATION_MAKE_CALL(StimulationAddForce)
__END_LIBMULTISCALE__

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