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element.hh
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/**
* @file element.hh
*
* @author Alejandro M. Aragón <alejandro.aragon@epfl.ch>
*
* @date creation: Fri Jan 04 2013
* @date last modification: Sun Oct 19 2014
*
* @brief contact element classes
*
* @section LICENSE
*
* Copyright (©) 2014, 2015 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 __AKANTU_CELEMENT_HH__
#define __AKANTU_CELEMENT_HH__
#include <iostream>
#include "aka_common.hh"
#include "aka_point.hh"
#include "solid_mechanics_model.hh"
#include "mesh.hh"
#include "contact_common.hh"
#if AKANTU_OPTIMIZATION
# include "aka_optimize.hh"
#endif
__BEGIN_AKANTU__
using std::cout;
using std::endl;
// compute signed measure, used to find out if a node penetrates or not
template <int d>
bool check_penetration(UInt node, const Element* el, SolidMechanicsModel& model);
template <int d>
Point<d> minimize_distance(UInt node, const Element* el, SolidMechanicsModel& model);
template <int d>
Real distance(UInt node, const Element* el, SolidMechanicsModel& model) {
typedef Point<d> point_type;
const Array<Real> &x = model.getCurrentPosition();
// get point of node
point_type o(&x(node));
// compute closest location within the element to master node
point_type p = minimize_distance<d>(node, el, model);
return sqrt((o-p).sq_norm());
}
template <int d>
class CElement {
typedef Point<d> point_type;
typedef const Element* element_pointer;
UInt master_; //!< Slave node
element_pointer element_; //!< Master surface element
SolidMechanicsModel& model_;
public:
CElement(UInt n, element_pointer el, SolidMechanicsModel& model) : master_(n), element_(el), model_(model) {}
//! Checks if there is penetration between the master node and the element
bool penetrates() const {
#ifdef DEBUG_CONTACT
cout<<"*** INFO *** Checking penetration for"<<*this<<endl;
#endif
return check_penetration<d>(master_, element_, model_);
}
void remove_penetration() const {
#ifdef DEBUG_CONTACT
cout<<"*** INFO *** Removing penetration for master node "<<master_<<endl;
#endif
cout<<"before calling minimize distance"<<endl;
// compute closest location within the element to master node
point_type o = minimize_distance<d>(master_, element_, model_);
cout<<"after calling minimize"<<endl;
cout<<"point obtained -> "<<o<<endl;
// modify master node coordinates
Array<Real> &X = model_.getDisplacement();
const Array<Real> &coord = model_.getMesh().getNodes();
for (UInt i=0; i<d; ++i)
X(master_, i) = o[i] - coord(master_, i);
cout<<"after modifying master node coords"<<endl;
}
//! Enable std output
friend std::ostream& operator<<(std::ostream& os, const CElement& cel) {
Mesh& mesh = cel.model_.getMesh();
const Array<Real> &x = cel.model_.getCurrentPosition();
UInt nb_nodes = mesh.getNbNodesPerElement((cel.element_)->type);
const Array<UInt> &conn = mesh.getConnectivity((cel.element_)->type);
os<<" Contact element: "<<endl;
os<<" slave node: "<<cel.master_<<", coordinates: "<<point_type(&x(cel.master_))<<endl;
os<<" master surface element: "<<*cel.element_<<", with extreme nodes";
for (int i=0; i<d; ++i)
os<<" - "<<point_type(&x(conn((cel.element_)->element, i)));
os<<endl;
return os;
}
};
__END_AKANTU__
#endif /* __AKANTU_CELEMENT_HH__ */

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