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element_class_triangle_3_inline_impl.hh
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Wed, May 1, 17:42

element_class_triangle_3_inline_impl.hh
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/**
* @file element_class_triangle_3_inline_impl.hh
*
* @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
* @author Mohit Pundir <mohit.pundir@epfl.ch>
* @author Nicolas Richart <nicolas.richart@epfl.ch>
*
* @date creation: Fri Jul 16 2010
* @date last modification: Fri Dec 11 2020
*
* @brief Specialization of the element_class class for the type _triangle_3
*
*
* @section LICENSE
*
* Copyright (©) 2010-2021 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu 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.
*
* Akantu 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 Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/**
* @verbatim
\eta
^
|
x (0,0,1)
|`
| `
| q `
| ° `
x--------x-----> \xi
(1,0,0) (0,1,0)
@endverbatim
*
* @f{eqnarray*}{
* N1 &=& 1 - \xi - \eta \\
* N2 &=& \xi \\
* N3 &=& \eta
* @f}
*
* @f{eqnarray*}{
* \xi_{q0} &=& 1/3 \qquad \eta_{q0} = 1/3
* @f}
*/
/* -------------------------------------------------------------------------- */
#include "element_class.hh"
/* -------------------------------------------------------------------------- */
namespace akantu {
/* -------------------------------------------------------------------------- */
AKANTU_DEFINE_ELEMENT_CLASS_PROPERTY(_triangle_3, _gt_triangle_3,
_itp_lagrange_triangle_3, _ek_regular, 2,
_git_triangle, 1);
/* -------------------------------------------------------------------------- */
template <>
template <class D1, class D2,
aka::enable_if_t<aka::are_vectors<D1, D2>::value> *>
inline void InterpolationElement<_itp_lagrange_triangle_3>::computeShapes(
const Eigen::MatrixBase<D1> &X, Eigen::MatrixBase<D2> &N) {
N(0) = 1 - X(0) - X(1); /// @f$ c0 = 1 - \xi - \eta @f$
N(1) = X(0); /// @f$ c1 = \xi @f$
N(2) = X(1); /// @f$ c2 = \eta @f$
}
/* -------------------------------------------------------------------------- */
template <>
template <class D1, class D2>
inline void InterpolationElement<_itp_lagrange_triangle_3>::computeDNDS(
const Eigen::MatrixBase<D1> & /*natural_coords*/,
Eigen::MatrixBase<D2> &dnds) {
/**
* @f[
* dnds = \left(
* \begin{array}{cccccc}
* \frac{\partial N1}{\partial \xi} & \frac{\partial N2}{\partial
* \xi} & \frac{\partial N3}{\partial \xi} \\
* \frac{\partial N1}{\partial \eta} & \frac{\partial N2}{\partial
* \eta} & \frac{\partial N3}{\partial \eta}
* \end{array}
* \right)
* @f]
*/
dnds(0, 0) = -1.;
dnds(0, 1) = 1.;
dnds(0, 2) = 0.;
dnds(1, 0) = -1.;
dnds(1, 1) = 0.;
dnds(1, 2) = 1.;
}
/* -------------------------------------------------------------------------- */
template <>
template <class vector_type, class matrix_type>
inline void InterpolationElement<_itp_lagrange_triangle_3>::computeD2NDS2(
const vector_type & /*natural_coords*/, matrix_type &d2nds2) {
d2nds2.zero();
}
/* -------------------------------------------------------------------------- */
template <>
template <class D>
inline Real GeometricalElement<_gt_triangle_3>::getInradius(
const Eigen::MatrixBase<D> &coord) {
auto &&coord1 = coord.col(0);
auto &&coord2 = coord.col(1);
auto &&coord3 = coord.col(2);
return 2. * Math::triangle_inradius(coord1, coord2, coord3);
}
/* -------------------------------------------------------------------------- */
} // namespace akantu

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