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squared_exponential_adhesion_functional.cpp
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Sat, Aug 17, 19:34
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rTAMAAS tamaas
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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