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adhesion_functional.cpp
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rTAMAAS tamaas
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 "adhesion_functional.hh"
#include <cmath>
/* -------------------------------------------------------------------------- */
__BEGIN_TAMAAS__
AdhesionFunctional
::
AdhesionFunctional
(
BemFFTBase
&
bem
)
:
ElasticEnergyFunctional
(
bem
),
rho
(
1.
),
surface_energy
(
1.
),
exponential_term
(
bem
.
getSurface
().
size
(),
bem
.
getSurface
().
getL
()),
spectral_disp
(
bem
.
getSurface
().
size
(),
bem
.
getSurface
().
getL
())
{}
AdhesionFunctional
::~
AdhesionFunctional
()
{}
void
AdhesionFunctional
::
computeF
()
{
Real
res
=
0
;
this
->
F
=
res
;
}
void
AdhesionFunctional
::
computeGradF
()
{
Surface
<
Real
>
&
disp
=
const_cast
<
Surface
<
Real
>
&>
(
bem
.
getTrueDisplacements
());
const
Surface
<
Real
>
&
influence_coefficients
=
this
->
bem
.
getSpectralInfluenceOverDisplacement
();
const
UInt
n
=
this
->
exponential_term
.
size
();
const
UInt
size
=
n
*
n
;
/// Computation of elastic energy gradient
disp
.
FFTTransform
(
this
->
spectral_disp
,
bem
.
getNumberOfThreads
());
this
->
spectral_disp
(
0
)
=
0
;
#pragma omp parallel for
for
(
UInt
i
=
1
;
i
<
size
;
++
i
){
this
->
spectral_disp
(
i
)
/=
influence_coefficients
(
i
);
}
this
->
spectral_disp
.
FFTITransform
(
this
->
gradF
,
bem
.
getNumberOfThreads
());
/// Computation of adhesion energy gradient
this
->
computeExponentialTerm
();
#pragma omp parallel for
for
(
UInt
i
=
0
;
i
<
size
;
++
i
){
this
->
gradF
(
i
)
+=
this
->
exponential_term
(
i
)
/
this
->
rho
;
}
}
void
AdhesionFunctional
::
computeExponentialTerm
()
{
const
Surface
<
Real
>
&
gap
=
bem
.
getGap
();
const
UInt
n
=
gap
.
size
();
const
UInt
size
=
n
*
n
;
if
(
this
->
surface_energy
!=
0.
)
{
#pragma omp parallel for
for
(
UInt
i
=
0
;
i
<
size
;
++
i
)
{
if
(
gap
(
i
)
>=
0.
){
this
->
exponential_term
(
i
)
=
this
->
surface_energy
*
exp
(
-
gap
(
i
)
/
this
->
rho
);
// std::cout << "exp terme "<< exp(- gap(i) / this->rho) << std::endl;
}
}}
}
__END_TAMAAS__
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