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elastic_functional.cpp
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Mon, May 6, 10:31

elastic_functional.cpp
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/*
* SPDX-License-Indentifier: AGPL-3.0-or-later
*
* Copyright (©) 2016-2022 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
* Copyright (©) 2020-2022 Lucas Frérot
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "elastic_functional.hh"
/* -------------------------------------------------------------------------- */
namespace tamaas {
namespace functional {
Real ElasticFunctionalPressure::computeF(GridBase<Real>& pressure,
GridBase<Real>& dual) const {
// This doesn't work if dual is multi-component
*buffer = dual;
// this can get large
const unsigned long long n = dual.getGlobalNbPoints();
return (pressure.dot(*buffer) / 2 - pressure.dot(surface)) / n;
}
/* -------------------------------------------------------------------------- */
void ElasticFunctionalPressure::computeGradF(GridBase<Real>& pressure,
GridBase<Real>& gradient) const {
this->op.apply(pressure, *buffer);
// This doesn't work if dual is multi-component
*buffer -= surface;
gradient += *buffer;
}
/* -------------------------------------------------------------------------- */
Real ElasticFunctionalGap::computeF(GridBase<Real>& gap,
GridBase<Real>& dual) const {
// This doesn't work if dual is multi-component
*buffer = gap;
*buffer += surface;
const UInt n = dual.getGlobalNbPoints();
const Real F = 0.5 * buffer->dot(dual);
return F / n; // avoid integer overflow
}
/* -------------------------------------------------------------------------- */
void ElasticFunctionalGap::computeGradF(GridBase<Real>& gap,
GridBase<Real>& gradient) const {
*buffer = gap;
*buffer += surface; // Now we have displacements
this->op.apply(*buffer, *buffer);
gradient += *buffer;
}
} // namespace functional
} // namespace tamaas

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