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spring_bc.hh
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/**
* @file spring_bc.hh
* @author Dana Christen <dana.christen@epfl.ch>
* @author David Kammer <david.kammer@epfl.ch>
* @date Tue Jun 18 16:12:38 2013
*
* @brief spring boundary condition
*
* @section LICENSE
*
* Copyright (©) 2010-2011 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"
__BEGIN_SIMTOOLS__
/* -------------------------------------------------------------------------- */
using 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:
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:
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;
// }
__END_SIMTOOLS__
#endif /* __AST_SPRING_BC_HH__ */
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