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force_based_dirichlet.hh
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/**
* @file force_based_dirichlet.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 dirichlet boundary condition that tries
* to keep the force at a given value
*
*
* 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_FORCE_BASED_DIRICHLET_HH_
#define AST_FORCE_BASED_DIRICHLET_HH_
// akantu
#include "aka_common.hh"
namespace akantu {
/* -------------------------------------------------------------------------- */
class ForceBasedDirichlet : public BC::Dirichlet::IncrementValue {
protected:
typedef const Array<Real> * RealArrayPtr;
typedef const Array<Int> * IntArrayPtr;
/* ------------------------------------------------------------------------ */
/* Constructors/Destructors */
/* ------------------------------------------------------------------------ */
public:
ForceBasedDirichlet(SolidMechanicsModel & model, BC::Axis ax, Real target_f,
Real mass = 0.)
: IncrementValue(0., ax), model(model), mass(mass), velocity(0.),
target_force(target_f), total_residual(0.) {}
virtual ~ForceBasedDirichlet() {}
/* ------------------------------------------------------------------------ */
/* Methods */
/* ------------------------------------------------------------------------ */
public:
void updateTotalResidual() {
this->total_residual = 0.;
for (auto && subboundary : this->subboundaries) {
this->total_residual +=
integrateResidual(subboundary, this->model, this->axis);
}
}
virtual Real update() {
AKANTU_DEBUG_IN();
this->updateTotalResidual();
Real total_force = this->target_force + this->total_residual;
Real a = total_force / this->mass;
Real dt = model.getTimeStep();
this->velocity += 0.5 * dt * a;
this->value =
this->velocity * dt + 0.5 * dt * dt * a; // increment position dx
this->velocity += 0.5 * dt * a;
AKANTU_DEBUG_OUT();
return this->total_residual;
}
Real applyYourself() {
AKANTU_DEBUG_IN();
Real reaction = this->update();
for (auto && subboundary : this->subboundaries) {
this->model.applyBC(*this, subboundary);
}
AKANTU_DEBUG_OUT();
return reaction;
}
/* ------------------------------------------------------------------------ */
/* Accessors */
/* ------------------------------------------------------------------------ */
public:
AKANTU_SET_MACRO(Mass, mass, Real);
AKANTU_SET_MACRO(TargetForce, target_force, Real);
void insertSubBoundary(const std::string & sb_name) {
this->subboundaries.insert(sb_name);
}
/* ------------------------------------------------------------------------ */
/* Class Members */
/* ------------------------------------------------------------------------ */
typedef std::set<std::string> SubBoundarySet;
protected:
SolidMechanicsModel & model;
SubBoundarySet subboundaries;
Real mass;
Real velocity;
Real target_force;
Real total_residual;
};
} // namespace akantu
#endif /* AST_FORCE_BASED_DIRICHLET_HH_ */

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