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tamaas/src/bem/squared_exponential_adhesion_functional.cpp
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squared_exponential_adhesion_functional.cpp
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/**
*
* @author Lucas Frérot <lucas.frerot@epfl.ch>
*
* @section LICENSE
*
* Copyright (©) 2016 EPFL (Ecole Polytechnique Fédérale de
* Lausanne) Laboratory (LSMS - Laboratoire de Simulation en Mécanique des
* Solides)
*
* Tamaas 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.
*
* Tamaas 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 Tamaas. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "squared_exponential_adhesion_functional.hh"
/* -------------------------------------------------------------------------- */
namespace tamaas {
/* -------------------------------------------------------------------------- */
SquaredExponentialAdhesionFunctional::SquaredExponentialAdhesionFunctional(
BemFFTBase& bem)
: Functional(bem),
exponential_term(bem.getSurface().size(), bem.getSurface().getL()),
surface_t(bem.getSurface().size(), bem.getSurface().getL()) {}
/* -------------------------------------------------------------------------- */
SquaredExponentialAdhesionFunctional::~SquaredExponentialAdhesionFunctional() {}
/* -------------------------------------------------------------------------- */
Real SquaredExponentialAdhesionFunctional::computeF() {
this->computeExponentialTerm();
return -SurfaceStatistics::computeSum(this->exponential_term);
}
/* -------------------------------------------------------------------------- */
void SquaredExponentialAdhesionFunctional::computeGradFU() {
this->computeExponentialTerm();
*this->gradF += this->exponential_term;
}
/* -------------------------------------------------------------------------- */
void SquaredExponentialAdhesionFunctional::computeGradFP() {
SURFACE_FATAL("Adhesion functional (exponential) cannot be differentiated "
"with respect to P");
}
/* -------------------------------------------------------------------------- */
void SquaredExponentialAdhesionFunctional::computeExponentialTerm() {
const Surface<Real>& gap = bem.getGap();
const UInt n = gap.size();
const UInt size = n * n;
Real rho = this->getParameter("rho");
Real surface_energy = this->getParameter("surface_energy");
if (surface_energy != 0.) {
#pragma omp parallel for
for (UInt i = 0; i < size; ++i) {
if (gap(i) >= -1.e-8) {
this->exponential_term(i) = (gap(i)) * surface_energy *
exp(-(gap(i)) * (gap(i)) / 2 * rho * rho) /
(rho * rho);
}
}
}
}
} // namespace tamaas
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