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spring_bc.hh
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Wed, Sep 11, 20:35
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rAKA akantu
spring_bc.hh
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/**
* @file spring_bc.hh
*
* @author Dana Christen <dana.christen@epfl.ch>
* @author David Simon Kammer <david.kammer@epfl.ch>
*
* @date creation: Tue Dec 02 2014
* @date last modification: Fri Feb 23 2018
*
* @brief spring boundary condition
*
*
* Copyright (©) 2015-2018 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/>.
*
*/
/* -------------------------------------------------------------------------- */
#ifndef AST_SPRING_BC_HH_
#define AST_SPRING_BC_HH_
// simtools
#include "force_based_dirichlet.hh"
namespace
akantu
{
/* -------------------------------------------------------------------------- */
class
SpringBC
:
public
ForceBasedDirichlet
{
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public
:
SpringBC
(
SolidMechanicsModel
&
model
,
BC
::
Axis
ax
,
Real
stiffness
,
Real
mass
=
0.
)
:
ForceBasedDirichlet
(
model
,
ax
,
0.
,
mass
),
stiffness
(
stiffness
),
elongation
(
0.
)
{}
virtual
~
SpringBC
()
{}
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public
:
virtual
Real
update
()
{
AKANTU_DEBUG_IN
();
this
->
target_force
=
-
this
->
stiffness
*
this
->
elongation
;
Real
reaction
=
ForceBasedDirichlet
::
update
();
this
->
elongation
+=
this
->
value
;
AKANTU_DEBUG_OUT
();
return
reaction
;
}
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public
:
AKANTU_GET_MACRO
(
Elongation
,
elongation
,
Real
);
inline
void
setToEquilibrium
()
{
AKANTU_DEBUG_IN
();
this
->
updateTotalResidual
();
this
->
target_force
=
-
this
->
total_residual
;
this
->
elongation
=
-
this
->
target_force
/
this
->
stiffness
;
AKANTU_DEBUG_OUT
();
}
/// change elongation
/// dx > 0 -> target_force < 0
inline
void
incrementElongation
(
Real
dx
)
{
AKANTU_DEBUG_IN
();
this
->
elongation
+=
dx
;
AKANTU_DEBUG_OUT
();
}
// friend std::ostream& operator<<(std::ostream& out, const SpringBC &
// spring);
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
protected
:
Real
stiffness
;
Real
elongation
;
};
// class SpringBCRestricted : public SpringBC {
// public:
// SpringBCRestricted(BC::Axis ax, Real target_force, BC::Axis surface_axis,
// Real min, Real max)
// :SpringBC(ax, target_force), surface_axis(surface_axis), min(min),
// max(max) {}
// virtual ~SpringBCRestricted() {}
// public:
// inline void operator()(UInt node, Vector<bool> & flags, Vector<Real> &
// primal, const Vector<Real> & coord) const {
// if(coord(surface_axis) > min && coord(surface_axis) < max) {
// SpringBC::operator()(node, flags, primal, coord);
// }
// }
// private:
// BC::Axis surface_axis;
// Real min;
// Real max;
// };
// std::ostream& operator<<(std::ostream& out, const SpringBC & spring) {
// out << "Real total_residual: " << *spring.total_residual << std::endl;
// out << "Real mass: " << spring.mass << std::endl;
// out << "Real k: " << spring.k << std::endl;
// out << "Real delta_x: " << spring.delta_x << std::endl;
// out << "Real dt: " << spring.dt << std::endl;
// out << "Real v: " << spring.v << std::endl;
// out << "Real dx: " << spring.dx << std::endl;
// out << "Real forcing_vel: " << spring.forcing_vel << std::endl;
// return out;
// }
}
// namespace akantu
#endif
/* AST_SPRING_BC_HH_ */
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