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compute_ekin.cc
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/**
* @file compute_ekin.cc
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
*
* @date Wed Jul 09 21:59:47 2014
*
* @brief This computes the kinetic energy of a set of DOFs
*
* @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 "compute_ekin.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"
#include "units.hh"
#include "units_converter.hh"
/* -------------------------------------------------------------------------- */
__BEGIN_LIBMULTISCALE__
ComputeEKin::ComputeEKin(const std::string &name)
: LMObject(name), based_on_nodes_flag(false) {
this->createInput("domain");
auto output_names =
std::list<std::string>{"nb_points", "Temperature", "EKin", "EKin_vector"};
this->createArrayOutputs(output_names);
}
/* -------------------------------------------------------------------------- */
ComputeEKin::~ComputeEKin() {}
/* -------------------------------------------------------------------------- */
template <typename Cont> enable_if_md<Cont> ComputeEKin::build(Cont &cont) {
constexpr UInt Dim = Cont::Dim;
Array1D<Dim> computed_ekin;
computed_ekin = 0.;
UInt cpt = cont.size();
for (auto &&at : cont) {
Array1D<Dim> vel = at.velocity();
computed_ekin += vel * vel * at.mass();
}
computed_ekin *= 0.5 * code_unit_system.mvv2e;
for (UInt i = 0; i < Dim; ++i) {
DUMP("computed ekin[" << i << "] = " << computed_ekin[i], DBG_INFO);
}
CommGroup &group = cont.getCommGroup();
group.allReduce(computed_ekin.data(), Dim, "kinetic energy reduce", OP_SUM);
group.allReduce(&cpt, 1, "kinetic energy counter reduce", OP_SUM);
Real ekin = 0.0;
for (UInt i = 0; i < Dim; ++i) {
DUMP("ekin[" << i << "] = " << computed_ekin[i], DBG_INFO);
ekin += computed_ekin[i];
}
// compute temperature
UnitsConverter unit;
unit.setInUnits(code_unit_system);
unit.setOutUnits(si_unit_system);
unit.computeConversions();
Real T = 2. / cpt / Dim / boltzmann * (ekin * unit.getConversion<Energy>());
// convert the kinetic energies to the required unit systems
// unit.setOutUnits(this->unit_system);
// unit.computeConversions();
// ekin *= unit.getConversion<Energy>();
// for (UInt i = 0; i < Dim; ++i) computed_ekin[i] *=
// unit.getConversion<Energy>();
DUMP("nb_points = " << cpt, DBG_INFO);
this->clear();
Real nb_points = static_cast<Real>(cpt);
this->getOutputAsArray("nb_points").push_back(nb_points);
this->getOutputAsArray("Temperature").push_back(T);
this->getOutputAsArray("EKin").push_back(ekin);
this->getOutputAsArray("EKin_vector").resize(0, Dim);
this->getOutputAsArray("EKin_vector").push_back(computed_ekin);
}
/* -------------------------------------------------------------------------- */
template <typename Cont> enable_if_mesh<Cont> ComputeEKin::build(Cont &cont) {
constexpr UInt Dim = Cont::Dim;
if (based_on_nodes_flag) {
buildBasedOnNodes<Dim>(cont);
return;
}
Real computed_ekin = 0.0;
for (auto &&el : cont.getContainerElems()) {
computed_ekin += el.getEKin();
}
CommGroup &group = cont.getCommGroup();
group.allReduce(&computed_ekin, 1, " kinetic energy reduce", OP_SUM);
this->clear();
this->getOutputAsArray("EKin").push_back(computed_ekin);
}
/* -------------------------------------------------------------------------- */
template <UInt Dim, typename Cont>
void ComputeEKin::buildBasedOnNodes(Cont &cont) {
Vector<Dim> computed_ekin = Array1D<Dim>::Zero();
UInt cpt = cont.size();
for (auto &&at : cont.filter(~(dt_pbc_slave | dt_slave))) {
auto vel = at.velocity();
computed_ekin += 0.5 * at.mass() * Vector<Dim>(vel.array() * vel.array()) *
code_unit_system.mvv2e;
}
CommGroup &group = cont.getCommGroup();
group.allReduce(&computed_ekin[0], Dim, "kinetic energy reduce", OP_SUM);
group.allReduce(&cpt, 1, "kinetic energy counter reduce", OP_SUM);
Real ekin = 0.0;
for (UInt i = 0; i < Dim; ++i) {
DUMP("ekin[" << i << "] = " << computed_ekin[i], DBG_INFO);
ekin += computed_ekin[i];
}
DUMP("nb_points = " << cpt, DBG_INFO);
this->clear();
Real nb_points = static_cast<Real>(cpt);
this->getOutputAsArray("nb_points").push_back(nb_points);
this->getOutputAsArray("EKin").push_back(ekin);
this->getOutputAsArray("EKin_vector").resize(0, Dim);
this->getOutputAsArray("EKin_vector").push_back(computed_ekin);
DUMP("Kinetic energy based on nodes could be higher than the one computed "
"from elements.",
DBG_WARNING);
}
/* -------------------------------------------------------------------------- */
/* LMDESC EKIN
This computes the kinetic energy of the region provided as input
*/
/* LMEXAMPLE FILTER ekin EKIN INPUT md */
inline void ComputeEKin::declareParams() {
ComputeInterface::declareParams();
/* LMKEYWORD BASED_ON_NODES
Specify that the selection should be based on the
nodes of the element. Valid for only FE.
*/
this->parseTag("BASED_ON_NODES", based_on_nodes_flag, false);
}
/* -------------------------------------------------------------------------- */
DECLARE_COMPUTE_MAKE_CALL(ComputeEKin)
__END_LIBMULTISCALE__

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